Update Gradle Wrapper 6.3 und Asciidoctor 3.3.0 - OP#193

.gitattributes

@@ -1,6 +0,0 @@
-#
-# https://help.github.com/articles/dealing-with-line-endings/
-#
-# These are explicitly windows files and should use crlf
-*.bat           text eol=crlf
-

.github/workflows/gradle.yml

@@ -1,26 +0,0 @@
-# This workflow will build a Java project with Gradle
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
-
-name: Java CI with Gradle
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
-      with:
-        java-version: 1.8
-    - name: Grant execute permission for gradlew
-      run: chmod +x gradlew
-    - name: Build with Gradle
-      run: ./gradlew build

.gitignore

@@ -15,3 +15,9 @@ gradle-app.setting
 
 # Ignore Gradle build output directory
 build
+.settings/
+bin/
+.project
+.classpath
+.asciidoctorconfig.adoc
+.vscode/

.gitlab-ci.yml

@@ -0,0 +1,59 @@
+variables:
+  GRADLE_OPTS: "-Dorg.gradle.daemon=false"
+
+before_script:
+  - source "/home/gitlab-runner/.sdkman/bin/sdkman-init.sh"
+  - sdk u java 11.0.12-open
+
+stages:
+  - build
+  - test
+  - docs
+  - analysis
+  - publish
+
+Build Application:
+  stage: build
+  script: ./gradlew --build-cache compileJava
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: push
+    paths:
+      - build
+      - .gradle
+
+Create Documentation:
+  stage: build
+  script: ./gradlew asciidoctorPdf
+
+Test Application:
+  stage: test
+  script: ./gradlew check
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: pull
+    paths:
+      - build
+      - .gradle
+
+sonarqube-check:
+  stage: analysis
+  variables:
+    SONAR_USER_HOME: "${CI_PROJECT_DIR}/.sonar"  # Defines the location of the analysis task cache
+    GIT_DEPTH: "0"  # Tells git to fetch all the branches of the project, required by the analysis task
+  cache:
+    key: "${CI_JOB_NAME}"
+    paths:
+      - .sonar/cache
+  script: ./gradlew sonarqube
+  allow_failure: true
+
+Publish Artifacts:
+  stage: publish
+  script: ./gradlew publish
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: pull
+    paths:
+      - build
+      - .gradle

build.gradle

@@ -1,29 +1,114 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * This generated file contains a sample Java Library project to get you started.
- * For more details take a look at the Java Libraries chapter in the Gradle
- * User Manual available at https://docs.gradle.org/6.3/userguide/java_library_plugin.html
- */
-
 plugins {
-    // Apply the java-library plugin to add support for Java Library
     id 'java-library'
+    id 'jacoco'
+    id "org.sonarqube" version "3.3"
+    id 'org.asciidoctor.jvm.pdf' version '3.3.2'
+    id 'org.asciidoctor.jvm.convert' version '3.3.2'
+    id 'org.asciidoctor.jvm.gems' version '3.3.2'
+    id 'maven-publish'
 }
 
 repositories {
-    // Use jcenter for resolving dependencies.
-    // You can declare any Maven/Ivy/file repository here.
     jcenter()
+    ruby.gems()
 }
 
 dependencies {
-    // This dependency is exported to consumers, that is to say found on their compile classpath.
+    asciidoctorGems 'rubygems:rouge:3.15.0'
-    api 'org.apache.commons:commons-math3:3.6.1'
+    asciidoctorGems 'rubygems:asciidoctor-diagram:2.2.2'
-
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.8.2'
-    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
-    implementation 'com.google.guava:guava:28.2-jre'
+}
-
+
-    // Use JUnit test framework
+final BUILD_DATE = new Date().format('dd.MM.yyyy').toString()
-    testImplementation 'junit:junit:4.12'
+def pdfFile = layout.buildDirectory.file("docs/asciidocPdf/" + project.name + ".pdf")
+def pdfArtifact = artifacts.add('archives', pdfFile.get().asFile) {
+    type 'pdf'
+    builtBy asciidoctorPdf
+}
+sourceCompatibility = 1.8
+
+publishing {
+    publications {
+        maven(MavenPublication) {
+			group = group + '.docs'
+            artifactId = project.name
+            artifact pdfArtifact
+        }
+    }
+    publications {
+        osistacklibrary(MavenPublication) {
+            from components.java
+        }
+    }
+
+    repositories {
+        maven {
+            url "https://gitlab.thpeetz.de/api/v4/projects/${projectId}/packages/maven"
+            credentials(HttpHeaderCredentials) {
+                name = "Private-Token"
+                value = gitLabPrivateToken
+            }
+            authentication {
+                header(HttpHeaderAuthentication)
+            }
+        }
+    }
+}
+
+test {
+    useJUnitPlatform()
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+}
+
+jacocoTestReport {
+    reports {
+        xml.enabled true
+    }
+}
+
+test.finalizedBy jacocoTestReport
+
+sonarqube {
+    properties {
+        property "sonar.projectKey", "github_osi-stack_AYBw4khXuGIZKMqU5_ed"
+        property "sonar.host.url", "https://sonar.thpeetz.de"
+        property "sonar.login", "71bff82090aff3503c20d5070949c3bba548c51e"
+        property "sonar.qualitygate.wait", true
+        property "sonar.sourceEncoding", "UTF-8"
+    }
+}
+
+tasks.named('sonarqube').configure {
+    dependsOn test
+}
+
+asciidoctorPdf {
+    dependsOn asciidoctorGemsPrepare
+
+    baseDirFollowsSourceFile()
+
+    asciidoctorj {
+        requires 'rouge', 'asciidoctor-diagram'
+        attributes 'build-gradle':       file('build.gradle'),
+                   'endpoint-url':       'https://www.thpeetz.de',
+                   'source-highlighter': 'rouge',
+                   'imagesdir':          './images',
+                   'toc':                'left',
+                   'toc-title':          'Inhaltsverzeichnis',
+                   'revdate':            BUILD_DATE,
+                   'revnumber':          { project.version.toString() },
+                   'revremark':          'Entwurf',
+                   'chapter-label':      '',
+                   'icons':              'font',
+                   'idprefix':           'id_',
+                   'idseparator':        '-',
+                   'docinfo1':           ''
+	}
+}
+
+wrapper {
+    gradleVersion = "6.3"
 }

gradle.properties

@@ -0,0 +1,6 @@
+description='OSI Stack Library'
+version=0.1.0-SNAPSHOT
+group=de.thpeetz.network
+gitLabPrivateToken=bFcsw1ebNhoFgKysksU1
+projectId=168
+

settings.gradle

@@ -1,10 +1 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * The settings file is used to specify which projects to include in your build.
- *
- * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
- */
-
 rootProject.name = 'osi-stack'

src/docs/asciidoc/osi-stack.adoc

@@ -0,0 +1,93 @@
+= Projektbeschreibung osi-stack: Pflichtenheft und Projektbeschreibung
+:author: Thomas Peetz
+:email: <thomas.peetz@thpeetz.de>
+:doctype: article
+:sectnums:
+:sectnumlevels: 4
+:toc:
+:toclevels: 4
+:table-caption!:
+:counter: table-number: 0
+
+
+//[title="Dokumenthistorie", caption="Tabelle {counter:table-number} ", id="Tabelle-{counter:table-number}", options="header"]
+//[title="Dokumenthistorie", id="Table-{counter:table-number}", options="header", cols="4"]
+[title="Dokumenthistorie", id="Table-{counter:table-number}", options="header"]
+|===
+| Version | Datum      | Autor        | Änderungsgrund / Bemerkungen
+| 0.0.1   | 28.04.2022 | Thomas Peetz | Ersterstellung
+|===
+
+== Einführung
+
+=== Zweck
+
+Implementierung der OSI Layer 4 bis 7 in Java.
+
+=== Stakeholder des Systems
+
+=== Systemumfang
+
+==== Zielsetzung des Systems
+
+=== Systemübersicht
+
+==== Systemkontext
+
+==== Systemarchitektur
+
+===== Systemkomponente 1
+
+===== Systemkomponente 2
+
+==== Systemschnittstellen
+
+===== Realisierte Schnittstellen
+
+===== Verwendete Schnittstellen
+
+==== Logisches Datenmodell
+
+==== Einschränkungen
+
+== Anforderungen der Domäne
+
+=== Systemfunktionen
+
+==== Anwendungsfälle
+
+==== Akteure
+
+==== Zielgruppen
+
+=== Anforderungen
+
+==== Anforderungen an externe Schnittstellen
+
+==== Funktionale Anforderungen
+
+==== Qualitätsanforderungen
+
+==== Randbedingungen
+
+==== Weitere Anforderungen
+
+==== Wartungs- und Supportinformationen
+
+=== Verifikation
+
+[bibliography]
+== Referenzen
+
+- [[[1]]] http://www.gitlab.org
+
+[glossary]
+== Glossar
+
+== Verzeichnisse
+
+=== Abbildungsverzeichnis
+
+=== Tabellenverzeichnis
+
+<<Table-1, Tabelle 1>> <<Table-1>>

src/main/java/com/ibtp/network/osi/Library.java

@@ -1,10 +0,0 @@
-/*
- * This Java source file was generated by the Gradle 'init' task.
- */
-package com.ibtp.network.osi;
-
-public class Library {
-    public boolean someLibraryMethod() {
-        return true;
-    }
-}

src/main/java/de/thpeetz/network/osi/AccessPoint.java

@@ -0,0 +1,62 @@
+package de.thpeetz.network.osi;
+
+/**
+ * AccessPoint
+ * @author Thomas Peetz
+ *
+ */
+public class AccessPoint
+{
+    /**
+     * byte[] accessPoint
+     */
+    private byte[] accessPoint;
+
+    /**
+     * String accessPointString
+     */
+    private String accessPointString;
+
+    /**
+     * Standard constructor
+     */
+    public AccessPoint()
+    {
+    }
+
+    /**
+     * Constructor to initialize member accessPoint
+     */
+    public AccessPoint(String ap)
+    {
+        this.accessPointString = ap;
+        this.accessPoint = ap.getBytes();
+    }
+
+    /**
+     * Return byte array as string.
+     * @return
+     */
+    public final String getString()
+    {
+        return this.accessPointString;
+    }
+
+    /**
+     * Return byte array.
+     * @return
+     */
+    public final byte[] getData()
+    {
+        return this.accessPoint;
+    }
+
+    /**
+     * Return length of byte array.
+     * @return
+     */
+    public final byte getLength()
+    {
+        return (byte)this.accessPoint.length;
+    }
+}

src/main/java/de/thpeetz/network/osi/DataService.java

@@ -0,0 +1,22 @@
+package de.thpeetz.network.osi;
+
+public interface DataService
+{
+	/**
+	 * 
+	 * @param telegram
+	 */
+	void eventReceive(DataUnit telegram);
+
+	/**
+	 * eventSessionDown
+	 *
+	 */
+	void eventSessionDown();
+
+	/**
+	 * 
+	 *
+	 */
+	void eventClose();
+}

src/main/java/de/thpeetz/network/osi/DataUnit.java

@@ -0,0 +1,239 @@
+package de.thpeetz.network.osi;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public class DataUnit
+{
+    /**
+     * Contains the telegram as array of byte.
+     */
+    private byte[] buffer;
+
+    /**
+     * Contains the position.
+     */
+    private int pointer;
+
+    /**
+     * Contains the length of the actual telegram.
+     */
+    private int length;
+
+    /**
+     * Indicates whether the buffer is in READ or WRITE mode.
+     */
+    private boolean writeMode = false;
+
+    /**
+    * Class constructor
+    *
+    */
+    public DataUnit()
+    {
+        this.buffer = new byte[1024];
+    }
+
+    /**
+    * Initializes DataUnit with given array. The position is set to the first
+    * byte and the length is set to the length of the given array.
+    *
+    * @param telegram Telegram to decode
+    */
+    public void initialize(byte[] telegram)
+    {
+        if (telegram.length > this.buffer.length) this.buffer = new byte[telegram.length];
+        System.arraycopy(telegram, 0, this.buffer, 0, telegram.length);
+        this.length = telegram.length;
+        setToRead();
+    }
+
+    /**
+    * initialize
+    *
+    */
+    public void initialize()
+    {
+        this.length = 0;
+        setToRead();
+    }
+
+    /**
+    * addBuffer
+    *
+    * @param telegram parameter for addBuffer
+    */
+    public void addBuffer(byte[] telegram)
+    {
+        if (telegram.length + this.length > this.buffer.length) {
+            byte[] tmp = new byte[telegram.length + this.length];
+            System.arraycopy(this.buffer,0,tmp,0,this.buffer.length);
+            this.buffer = tmp;
+        }
+        System.arraycopy(telegram,0,this.buffer,this.length,telegram.length);
+        this.length += telegram.length;
+    }
+
+    /**
+    * setToWrite
+    *
+    */
+    public void setToWrite()
+    {
+        this.pointer = this.buffer.length;
+        this.length = 0;
+        this.writeMode = true;
+    }
+
+    /**
+    * setToRead
+    *
+    */
+    public void setToRead()
+    {
+        this.pointer = 0;
+        this.writeMode = false;
+    }
+
+    /**
+    * write
+    *
+    * @param data parameter for write
+    */
+    public void write(byte[] data)
+    {
+        if (!this.writeMode) return;
+        if (data.length+this.length > this.buffer.length)
+        {
+            byte[] tmp = this.buffer;
+            this.buffer = new byte[data.length+this.length];
+            int diff = this.buffer.length-tmp.length;
+            this.pointer += diff;
+            System.arraycopy(tmp,0,this.buffer,diff,tmp.length);
+        }
+        this.pointer = this.pointer-data.length;
+        System.arraycopy(data,0,this.buffer,this.pointer,data.length);
+        this.length = this.length+data.length;
+    }
+
+    /**
+    * write
+    *
+    * @param data parameter for write
+    */
+    public void write(byte data)
+    {
+        if (!this.writeMode) return;
+        if (this.length+1 > this.buffer.length)
+        {
+            byte[] tmp = this.buffer;
+            this.buffer = new byte[this.buffer.length+10];
+            int diff = this.buffer.length-tmp.length;
+            this.pointer += diff;
+            System.arraycopy(tmp,0,this.buffer,diff,tmp.length);
+        }
+        this.buffer[--this.pointer] = data; this.length++;
+    }
+
+    /**
+    * write
+    *
+    * @param data parameter for write
+    */
+    public void write(int data)
+    {
+        if (!this.writeMode) return;
+        if (this.length+2 > this.buffer.length)
+        {
+            byte[] tmp = this.buffer;
+            this.buffer = new byte[this.buffer.length+10];
+            int diff = this.buffer.length-tmp.length;
+            this.pointer += diff;
+            System.arraycopy(tmp,0,this.buffer,diff,tmp.length);
+        }
+        this.buffer[--this.pointer] = (byte)(0xff & data); this.length++;
+        this.buffer[--this.pointer] = (byte)( (0xff & (data >> 8)) ); this.length++;
+    }
+
+    /**
+    * Read next byte.
+    * @return Returns byte at the current position.
+    */
+    public final byte read()
+    {
+        this.length--;
+        return this.buffer[this.pointer++];
+    }
+
+    /**
+    * Reads next <code>size</code> bytes from buffer.
+    *
+    * @param size Length of bytes to be read from buffer
+    * @return Returns array of byte of length <code>size</code>
+    */
+    public final byte[] read(int size)
+    {
+        byte[] tmp = new byte[size];
+        System.arraycopy(this.buffer, this.pointer, tmp, 0, size);
+        this.pointer += size; this.length -= size;
+        return tmp;
+    }
+
+    /**
+    * Read next two bytes from buffer. The first byte is considered as HIGH BYTE
+    * the second as LOW BYTE.
+    *
+    * @return Returns int value.
+    */
+    public final int readInt()
+    {
+    	int highbyte = ((0xff & this.buffer[this.pointer++]) << 8);
+    	int lowbyte = (0xff & this.buffer[this.pointer++]);
+        //int tmp = (0xff & this.buffer[this.pointer++]) &  ((0xff & this.buffer[this.pointer++]) << 8);
+    	int tmp = lowbyte | highbyte;
+        this.length -= 2;
+        return tmp;
+    }
+
+    /**
+    * getBuffer
+    *
+    * @return the returned byte[]
+    */
+    public final byte[] getBuffer() {
+        byte[] tmp = new byte[this.length];
+        try {
+            System.arraycopy(this.buffer, this.pointer, tmp, 0, this.length);
+        } catch (ArrayIndexOutOfBoundsException exception) {
+            //System.out.println(buffer.length + "  " + pointer + "  " + tmp.length + "  " + length);
+        }
+        return tmp;
+    }
+
+    /**
+    * getBuffer
+    *
+    * @param count parameter for getBuffer
+    * @return the returned byte[]
+    */
+    public final byte[] getBuffer(int count) {
+        byte[] tmp = new byte[count];
+        try {
+            System.arraycopy(this.buffer, this.pointer, tmp, 0, count);
+            this.length -= count; this.pointer += count;
+        } catch (ArrayIndexOutOfBoundsException exception) {
+            //System.out.println(buffer.length + "  " + pointer + "  " + tmp.length + "  " + length);
+        }
+        return tmp;
+    }
+
+    /**
+    * getLength
+    *
+    * @return the returned int
+    */
+    public final int getLength() {
+        return this.length;
+    }
+}

src/main/java/de/thpeetz/network/osi/DataUnitManager.java

@@ -0,0 +1,63 @@
+package de.thpeetz.network.osi;
+
+import de.thpeetz.tools.ObjectPool;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public class DataUnitManager
+{
+    /**
+     * DataUnitManager self
+     */
+    private static DataUnitManager self = null;
+
+    /**
+     * ObjectPool objectPool
+     */
+    private ObjectPool<DataUnit> objectPool;
+
+    /**************************************************************************
+    * Class constructor
+    *
+    ***************************************************************************/
+    protected DataUnitManager()
+    {
+        this.objectPool = new ObjectPool<DataUnit>(DataUnit.class, 5);
+        for (int i=0; i <5; i++) {
+            this.objectPool.freeInstance(this.objectPool.getInstance());
+        }
+    }
+
+    /**************************************************************************
+    * getManager
+    *
+    * @return the returned DataUnitManager
+    ***************************************************************************/
+    protected static DataUnitManager getManager()
+    {
+        if (self == null) self = new DataUnitManager();
+        return self;
+    }
+
+    /**************************************************************************
+    * getInstance
+    *
+    * @return the returned DataUnit
+    ***************************************************************************/
+    public static synchronized DataUnit getInstance()
+    {
+        return getManager().objectPool.getInstance();
+    }
+
+    /**************************************************************************
+    * freeInstance
+    *
+    * @param object parameter for freeInstance
+    ***************************************************************************/
+    public static synchronized void freeInstance(DataUnit object)
+    {
+        getManager().objectPool.freeInstance(object);
+    }
+}

src/main/java/de/thpeetz/network/osi/presentation/PresentationLayer.java

@@ -0,0 +1,421 @@
+package de.thpeetz.network.osi.presentation;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.session.SessionLayer;
+import de.thpeetz.network.osi.session.SessionProvider;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public class PresentationLayer implements PresentationProvider, PresentationUser {
+	private SessionProvider provider;
+
+	public PresentationLayer(boolean manager, AccessPoint ssap, AccessPoint tsap) {
+		this.provider = new SessionLayer(manager, this, ssap, tsap);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationProvider#connectRequest(com.
+	 * peetz.network.osi.AccessPoint, com.peetz.network.osi.AccessPoint,
+	 * com.peetz.network.osi.AccessPoint, com.peetz.network.osi.AccessPoint,
+	 * com.peetz.network.osi.AccessPoint, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void connectRequest(AccessPoint calledNSAP, AccessPoint calledTSAP, AccessPoint calledSSAP,
+			AccessPoint callerPSAP, AccessPoint calledPSAP, int qualityOfService, DataUnit userData) {
+		this.provider.connectRequest(calledNSAP, calledTSAP, 1, null, calledSSAP, qualityOfService, 1, 1, 1, 1,
+				userData);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationProvider#releaseRequest(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void releaseRequest(DataUnit userData) {
+		this.provider.releaseRequest(userData);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationProvider#dataRequest(com.peetz
+	 * .network.osi.DataUnit)
+	 */
+	public void dataRequest(DataUnit userData) {
+		this.provider.dataRequest(userData);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationProvider#userAbortRequest(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void userAbortRequest(DataUnit userData) {
+		this.provider.userAbortRequest(userData);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#connectIndication(com.
+	 * peetz.network.osi.AccessPoint, com.peetz.network.osi.AccessPoint, int, int,
+	 * int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void connectIndication(AccessPoint callingAddress, AccessPoint calledAddress, int qualityOfService,
+			int representationRequirements, int mode, int sessionRequirements, int initialSPSerialNumber,
+			int assignmentOfTokens, int sessionConnectionIdentifier, DataUnit userData) {
+		System.out.println("PresentationLayer#connectIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#connectConfirm(com.peetz.
+	 * network.osi.AccessPoint, int, int, int, int, int, int,
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void connectConfirm(AccessPoint respondingAddress, int qualityOfService, int representationRequirements,
+			int sessionRequirements, int initialSPSerialNumber, int assignmentOfTokens, int sessionConnectionIdentifier,
+			DataUnit userData) {
+		System.out.println("PresentationLayer#connectConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#userAbortIndication(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void userAbortIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#userAbortIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#providerAbortIndication(
+	 * int)
+	 */
+	public void providerAbortIndication(int providerReason) {
+		System.out.println("PresentationLayer#providerAbortIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#alterContextIndication(
+	 * int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void alterContextIndication(int additionList, int deletionList, int additionResultList, DataUnit userData) {
+		System.out.println("PresentationLayer#alterContextIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#alterContextConfirm(int,
+	 * int, com.peetz.network.osi.DataUnit)
+	 */
+	public void alterContextConfirm(int additionResultList, int deletionResultList, DataUnit userData) {
+		System.out.println("PresentationLayer#alterContextConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#typedDataIndication(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void typedDataIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#typedDataIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#dataIndication(com.peetz.
+	 * network.osi.DataUnit)
+	 */
+	public void dataIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#dataIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#resynchronizeIndication(
+	 * int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void resynchronizeIndication(int type, int sPSerialNumber, int tokens, DataUnit userData) {
+		System.out.println("PresentationLayer#resynchronizeIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#resynchronizeConfirm(int,
+	 * int, com.peetz.network.osi.DataUnit)
+	 */
+	public void resynchronizeConfirm(int sPSerialNumber, int tokens, DataUnit userData) {
+		System.out.println("PresentationLayer#resynchronizeConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityStartIndication(
+	 * int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityStartIndication(int activityIdentifier, DataUnit userData) {
+		System.out.println("PresentationLayer#activityStartIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityResumeIndication(
+	 * int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityResumeIndication(int activityIdentifier, int oldActivityIdentifier, int sPSerialNumber,
+			int oldSessionIdentifier, DataUnit userData) {
+		System.out.println("PresentationLayer#activityResumeIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.peetz.network.osi.presentation.PresentationUser#
+	 * activityInterruptIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityInterruptIndication(int reason, DataUnit userData) {
+		System.out.println("PresentationLayer#activityInterruptIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityInterruptConfirm(
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void activityInterruptConfirm(DataUnit userData) {
+		System.out.println("PresentationLayer#activityInterruptConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityDiscardIndication
+	 * (int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityDiscardIndication(int reason, DataUnit userData) {
+		System.out.println("PresentationLayer#activityDiscardIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityDiscardConfirm(
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void activityDiscardConfirm(DataUnit userData) {
+		System.out.println("PresentationLayer#activityDiscardConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityEndIndication(
+	 * int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityEndIndication(int sPSerialNumber, DataUnit userData) {
+		System.out.println("PresentationLayer#activityEndIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#activityEndConfirm(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void activityEndConfirm(DataUnit userData) {
+		System.out.println("PresentationLayer#activityEndConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#capabilityDataIndication(
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void capabilityDataIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#capabilityDataIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#capabilityDataConfirm(com
+	 * .peetz.network.osi.DataUnit)
+	 */
+	public void capabilityDataConfirm(DataUnit userData) {
+		System.out.println("PresentationLayer#capabilityDataConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#controlGiveIndication(com
+	 * .peetz.network.osi.DataUnit)
+	 */
+	public void controlGiveIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#controlGiveIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#tokenGiveIndication(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void tokenGiveIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#tokenGiveIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#tokenPleaseIndication(
+	 * int, com.peetz.network.osi.DataUnit)
+	 */
+	public void tokenPleaseIndication(int tokens, DataUnit userData) {
+		System.out.println("PresentationLayer#tokenPleaseIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.peetz.network.osi.presentation.PresentationUser#
+	 * userExceptionReportIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void userExceptionReportIndication(int reason, DataUnit userData) {
+		System.out.println("PresentationLayer#userExceptionReportIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.peetz.network.osi.presentation.PresentationUser#
+	 * providerExceptionReportIndication(int)
+	 */
+	public void providerExceptionReportIndication(int reason) {
+		System.out.println("PresentationLayer#providerExceptionReportIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#expeditedDataIndication(
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void expeditedDataIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#expeditedDataIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#syncMinorIndication(int,
+	 * int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMinorIndication(int type, int sPSerialNumber, DataUnit userData) {
+		System.out.println("PresentationLayer#syncMinorIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#syncMinorConfirm(int,
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMinorConfirm(int sPSerialNumber, DataUnit userData) {
+		System.out.println("PresentationLayer#syncMinorConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#syncMajorIndication(int,
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMajorIndication(int sPSerialNumber, DataUnit userData) {
+		System.out.println("PresentationLayer#syncMajorIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#syncMajorConfirm(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void syncMajorConfirm(DataUnit userData) {
+		System.out.println("PresentationLayer#syncMajorConfirm");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.peetz.network.osi.presentation.PresentationUser#releaseIndication(com.
+	 * peetz.network.osi.DataUnit)
+	 */
+	public void releaseIndication(DataUnit userData) {
+		System.out.println("PresentationLayer#releaseIndication");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see com.peetz.network.osi.presentation.PresentationUser#releaseConfirm(int,
+	 * com.peetz.network.osi.DataUnit)
+	 */
+	public void releaseConfirm(int result, DataUnit userData) {
+		System.out.println("PresentationLayer#releaseConfirm");
+	}
+}

src/main/java/de/thpeetz/network/osi/presentation/PresentationProvider.java

@@ -0,0 +1,23 @@
+package de.thpeetz.network.osi.presentation;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public interface PresentationProvider extends PresentationService
+{
+    void connectRequest(AccessPoint calledNSAP,
+                        AccessPoint calledTSAP,
+                        AccessPoint calledSSAP,
+                        AccessPoint callerPSAP,
+                        AccessPoint calledPSAP,
+                        int qualityOfService,
+                        DataUnit userData);
+    void releaseRequest(DataUnit userData);
+    void dataRequest(DataUnit userData);
+
+    void userAbortRequest(DataUnit userData);
+}

src/main/java/de/thpeetz/network/osi/presentation/PresentationService.java

@@ -0,0 +1,11 @@
+package de.thpeetz.network.osi.presentation;
+
+/**
+ * Implementation of ITU-T X.226
+ * @author Thomas Peetz
+ *
+ */
+public interface PresentationService
+{
+
+}

src/main/java/de/thpeetz/network/osi/presentation/PresentationUser.java

@@ -0,0 +1,64 @@
+package de.thpeetz.network.osi.presentation;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public interface PresentationUser extends PresentationService
+{
+    void connectIndication(AccessPoint callingAddress,
+                           AccessPoint calledAddress,
+                           int qualityOfService,
+                           int representationRequirements,
+                           int mode,
+                           int sessionRequirements,
+                           int initialSPSerialNumber,
+                           int assignmentOfTokens,
+                           int sessionConnectionIdentifier,
+                           DataUnit userData);
+    void connectConfirm(AccessPoint respondingAddress,
+                        int qualityOfService,
+                        int representationRequirements,
+                        int sessionRequirements,
+                        int initialSPSerialNumber,
+                        int assignmentOfTokens,
+                        int sessionConnectionIdentifier,
+                        DataUnit userData);
+    void userAbortIndication(DataUnit userData);
+    void providerAbortIndication(int providerReason);
+    void alterContextIndication(int additionList, int deletionList,
+                                int additionResultList, DataUnit userData);
+    void alterContextConfirm(int additionResultList, int deletionResultList,
+                             DataUnit userData);
+    void typedDataIndication(DataUnit userData);
+    void dataIndication(DataUnit userData);
+    void resynchronizeIndication(int type, int sPSerialNumber, int tokens, DataUnit userData);
+    void resynchronizeConfirm(int sPSerialNumber, int tokens, DataUnit userData);
+    void activityStartIndication(int activityIdentifier, DataUnit userData);
+    void activityResumeIndication(int activityIdentifier, int oldActivityIdentifier,
+                                  int sPSerialNumber, int oldSessionIdentifier,
+                                  DataUnit userData);
+    void activityInterruptIndication(int reason, DataUnit userData);
+    void activityInterruptConfirm(DataUnit userData);
+    void activityDiscardIndication(int reason, DataUnit userData);
+    void activityDiscardConfirm(DataUnit userData);
+    void activityEndIndication(int sPSerialNumber, DataUnit userData);
+    void activityEndConfirm(DataUnit userData);
+    void capabilityDataIndication(DataUnit userData);
+    void capabilityDataConfirm(DataUnit userData);
+    void controlGiveIndication(DataUnit userData);
+    void tokenGiveIndication(DataUnit userData);
+    void tokenPleaseIndication(int tokens, DataUnit userData);
+    void userExceptionReportIndication(int reason, DataUnit userData);
+    void providerExceptionReportIndication(int reason);
+    void expeditedDataIndication(DataUnit userData);
+    void syncMinorIndication(int type, int sPSerialNumber, DataUnit userData);
+    void syncMinorConfirm(int sPSerialNumber, DataUnit userData);
+    void syncMajorIndication(int sPSerialNumber, DataUnit userData);
+    void syncMajorConfirm(DataUnit userData);
+    void releaseIndication(DataUnit userData);
+    void releaseConfirm(int result, DataUnit userData);
+}

src/main/java/de/thpeetz/network/osi/session/SessionLayer.java

@@ -0,0 +1,523 @@
+package de.thpeetz.network.osi.session;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.presentation.PresentationUser;
+import de.thpeetz.network.osi.transport.TransportLayer;
+import de.thpeetz.network.osi.transport.TransportProvider;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public class SessionLayer implements SessionProvider, SessionUser
+{
+	private PresentationUser user;
+	private TransportProvider provider;
+	@SuppressWarnings("unused")
+	private AccessPoint ssap;
+	private AccessPoint tsap;
+	
+	public SessionLayer(boolean manager, PresentationUser user, AccessPoint ssap, AccessPoint tsap)
+	{
+		this.user = user;
+		this.provider = new TransportLayer(manager, this, tsap);
+		this.ssap = ssap;
+		this.tsap = tsap;
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#connectRequest(com.peetz.network.osi.AccessPoint, com.peetz.network.osi.AccessPoint, int, com.peetz.network.osi.AccessPoint, com.peetz.network.osi.AccessPoint, int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void connectRequest(AccessPoint calledNSAP, AccessPoint calledTSAP,
+			int connectionIdentifier, AccessPoint callingSSAP,
+			AccessPoint calledSSAP, int qualityOfService,
+			int sessionRequirements, int firstSPSerialNumber,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData)
+	{
+		this.provider.connectRequest(calledNSAP, calledTSAP, this.tsap, true, 1, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#connectResponse(int, com.peetz.network.osi.AccessPoint, int, int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void connectResponse(int connectionIdentifier,
+			AccessPoint respondingAddress, int result, int qualityOfService,
+			int sessionRequirements, int firstSPSerialNumber,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData)
+	{
+		this.provider.connectResponse(qualityOfService, respondingAddress, true, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#dataRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void dataRequest(DataUnit userData)
+	{
+		this.provider.dataRequest(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#expeditedDataRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void expeditedDataRequest(DataUnit userData)
+	{
+		this.provider.expeditedDataRequest(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#typedDataRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void typedDataRequest(DataUnit userData)
+	{
+		System.out.println("SessionLayer#typedDataRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#capabilityDataRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void capabilityDataRequest(DataUnit userData)
+	{
+		System.out.println("SessionLayer#capabilityDataRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#capabilityDataResponse(com.peetz.network.osi.DataUnit)
+	 */
+	public void capabilityDataResponse(DataUnit userData)
+	{
+		System.out.println("SessionLayer#capabilityDataResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#tokenGiveRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void tokenGiveRequest(int tokens, DataUnit userData)
+	{
+		System.out.println("SessionLayer#tokenGiveRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#tokenPleaseRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void tokenPleaseRequest(int tokens, DataUnit userData)
+	{
+		System.out.println("SessionLayer#tokenPleaseRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#controlGiveRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void controlGiveRequest(DataUnit userData)
+	{
+		System.out.println("SessionLayer#controlGiveRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#syncMinorRequest(int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMinorRequest(int type, int dataSeparation,
+			int firstSPSerialNumber, DataUnit userdata)
+	{
+		System.out.println("SessionLayer#syncMinorRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#syncMinorResponse(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMinorResponse(int firstSPSerialNumber, DataUnit userData)
+	{
+		System.out.println("SessionLayer#syncMinorResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#syncMajorRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMajorRequest(int firstSPSerialNumber, DataUnit userdata)
+	{
+		System.out.println("SessionLayer#syncMajorRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#syncMajorResponse(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMajorResponse(int secondSPSerialNumber, DataUnit userData)
+	{
+		System.out.println("SessionLayer#syncMajorResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#resynchronizeRequest(int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void resynchronizeRequest(int firstResynchronizeType,
+			int firstSPSerialNumber, int secondResynchronizeType,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userdata)
+	{
+		System.out.println("SessionLayer#resynchronizeRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#resynchronizeResponse(int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void resynchronizeResponse(int firstResynchronizeType,
+			int firstSPSerialNumber, int secondResynchronizeType,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userdata)
+	{
+		System.out.println("SessionLayer#resynchronizeResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#userExceptionReportRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void userExceptionReportRequest(int reason, DataUnit userData)
+	{
+		System.out.println("SessionLayer#userExceptionReportRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityStartRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityStartRequest(int activityIdentifier, DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityStartRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityResumeRequest(int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityResumeRequest(int activityIdentifier,
+			int oldActivityIdentifier, int firstSPSerialNumber,
+			int secondSPSerialNumber, int oldSessionConnectionIdentifier,
+			DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityResumeRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityInterruptRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void activityInterruptRequest(DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityInterruptRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityInterruptResponse(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityInterruptResponse(int reason, DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityInterruptResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityDiscardRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityDiscardRequest(int reason, DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityDiscardRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityDiscardResponse(com.peetz.network.osi.DataUnit)
+	 */
+	public void activityDiscardResponse(DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityDiscardResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityEndRequest(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityEndRequest(int firstSPSerialNumber, DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityEndRequest");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#activityEndResponse(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityEndResponse(int secondSPSerialNumber, DataUnit userData)
+	{
+		System.out.println("SessionLayer#activityEndResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#releaseRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void releaseRequest(DataUnit userData)
+	{
+		this.provider.disconnectRequest(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#releaseResponse(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void releaseResponse(int result, DataUnit userData)
+	{
+		System.out.println("SessionLayer#releaseResponse");
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionProvider#userAbortRequest(com.peetz.network.osi.DataUnit)
+	 */
+	public void userAbortRequest(DataUnit userData)
+	{
+		this.provider.disconnectRequest(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#connectIndication(int, com.peetz.network.osi.AccessPoint, com.peetz.network.osi.AccessPoint, int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void connectIndication(int connectionIdentifier,
+			AccessPoint callingAddress, AccessPoint calledAddress,
+			int qualityOfService, int sessionRequirements,
+			int firstSPSerialNumber, int secondSPSerialNumber,
+			int assignmentOfTokens, DataUnit userData)
+	{
+		this.user.connectIndication(callingAddress, calledAddress, qualityOfService, 1, 1, sessionRequirements, firstSPSerialNumber, assignmentOfTokens, 1, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#connectConfirm(int, com.peetz.network.osi.AccessPoint, int, int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void connectConfirm(int connectionIdentifier,
+			AccessPoint respondingAddress, int result, int qualityOfService,
+			int sessionRequirements, int firstSPSerialNumber,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData)
+	{
+		this.user.connectConfirm(respondingAddress, qualityOfService, 1, sessionRequirements, firstSPSerialNumber, assignmentOfTokens, 1, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#dataIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void dataIndication(DataUnit userData)
+	{
+		this.user.dataIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#expeditedDataIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void expeditedDataIndication(DataUnit userData)
+	{
+		this.user.expeditedDataIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#typedDataIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void typedDataIndication(DataUnit userData)
+	{
+		this.user.typedDataIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#capabilityDataIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void capabilityDataIndication(DataUnit userData)
+	{
+		this.user.capabilityDataIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#capabilityDataConfirm(com.peetz.network.osi.DataUnit)
+	 */
+	public void capabilityDataConfirm(DataUnit userData)
+	{
+		this.user.capabilityDataConfirm(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#tokenGiveIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void tokenGiveIndication(int tokens, DataUnit userData)
+	{
+		this.user.tokenGiveIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#tokenPleaseIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void tokenPleaseIndication(int tokens, DataUnit userData)
+	{
+		this.user.tokenPleaseIndication(tokens, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#controlGiveIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void controlGiveIndication(DataUnit userData)
+	{
+		this.user.controlGiveIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#syncMinorIndication(int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMinorIndication(int type, int dataSeparation,
+			int firstSPSerialNumber, DataUnit userData)
+	{
+		this.user.syncMinorIndication(type, firstSPSerialNumber, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#syncMinorConfirm(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMinorConfirm(int firstSPSerialNumber, DataUnit userData)
+	{
+		this.user.syncMinorConfirm(firstSPSerialNumber, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#syncMajorIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMajorIndication(int firstSPSerialNumber, DataUnit userData)
+	{
+		this.user.syncMajorIndication(firstSPSerialNumber, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#syncMajorConfirm(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void syncMajorConfirm(int secondSPSerialNumber, DataUnit userData)
+	{
+		this.user.syncMajorConfirm(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#resynchronizeIndication(int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void resynchronizeIndication(int firstResynchronizeType,
+			int firstSPSerialNumber, int secondResynchronizeType,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData)
+	{
+		this.user.resynchronizeIndication(firstResynchronizeType, firstResynchronizeType, assignmentOfTokens, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#resynchronizeConfirm(int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void resynchronizeConfirm(int firstResynchronizeType,
+			int firstSPSerialNumber, int secondResynchronizeType,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData)
+	{
+		this.user.resynchronizeConfirm(firstSPSerialNumber, assignmentOfTokens, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#providerExceptionReportIndication(int)
+	 */
+	public void providerExceptionReportIndication(int reason)
+	{
+		this.user.providerExceptionReportIndication(reason);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#userExceptionReportIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void userExceptionReportIndication(int reason, DataUnit userData)
+	{
+		this.user.userExceptionReportIndication(reason, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityStartIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityStartIndication(int activityIdentifier,
+			DataUnit userData)
+	{
+		this.user.activityStartIndication(activityIdentifier, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityResumeIndication(int, int, int, int, int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityResumeIndication(int activityIdentifier,
+			int oldActivityIdentifier, int firstSPSerialNumber,
+			int secondSPSerialNumber, int oldSessionConnectionIdentifier,
+			DataUnit userData)
+	{
+		this.user.activityResumeIndication(activityIdentifier, oldActivityIdentifier, firstSPSerialNumber, oldSessionConnectionIdentifier, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityInterruptIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void activityInterruptIndication(DataUnit userData)
+	{
+		this.user.activityInterruptIndication(1, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityInterruptConfirm(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityInterruptConfirm(int reason, DataUnit userData)
+	{
+		this.user.activityInterruptConfirm(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityDiscardIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityDiscardIndication(int reason, DataUnit userData)
+	{
+		this.user.activityDiscardIndication(reason, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityDiscardConfirm(com.peetz.network.osi.DataUnit)
+	 */
+	public void activityDiscardConfirm(DataUnit userData)
+	{
+		this.user.activityDiscardConfirm(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityEndIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityEndIndication(int firstSPSerialNumber, DataUnit userData)
+	{
+		this.user.activityEndIndication(firstSPSerialNumber, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#activityEndConfirm(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void activityEndConfirm(int secondSPSerialNumber, DataUnit userData)
+	{
+		this.user.activityEndConfirm(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#releaseIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void releaseIndication(DataUnit userData)
+	{
+		this.user.releaseIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#releaseConfirm(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void releaseConfirm(int result, DataUnit userData)
+	{
+		this.user.releaseConfirm(result, userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#userAbortIndication(com.peetz.network.osi.DataUnit)
+	 */
+	public void userAbortIndication(DataUnit userData)
+	{
+		this.user.userAbortIndication(userData);
+	}
+
+	/* (non-Javadoc)
+	 * @see com.peetz.network.osi.session.SessionUser#providerAbortIndication(int, com.peetz.network.osi.DataUnit)
+	 */
+	public void providerAbortIndication(int reason, DataUnit userData)
+	{
+		this.user.providerAbortIndication(reason);
+	}
+}

src/main/java/de/thpeetz/network/osi/session/SessionProvider.java

@@ -0,0 +1,82 @@
+package de.thpeetz.network.osi.session;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * @author Thomas Peetz
+ * 
+ */
+public interface SessionProvider extends SessionService
+{
+    void connectRequest(AccessPoint calledNSAP, AccessPoint calledTSAP,
+                        int connectionIdentifier, AccessPoint callingSSAP,
+                        AccessPoint calledSSAP, int qualityOfService,
+                        int sessionRequirements, int firstSPSerialNumber,
+                        int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData);
+
+    void connectResponse(int connectionIdentifier,
+                         AccessPoint respondingAddress, int result, int qualityOfService,
+                         int sessionRequirements, int firstSPSerialNumber,
+                         int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData);
+
+    void dataRequest(DataUnit userData);
+
+    void expeditedDataRequest(DataUnit userData);
+
+    void typedDataRequest(DataUnit userData);
+
+    void capabilityDataRequest(DataUnit userData);
+
+    void capabilityDataResponse(DataUnit userData);
+
+    void tokenGiveRequest(int tokens, DataUnit userData);
+
+    void tokenPleaseRequest(int tokens, DataUnit userData);
+
+    void controlGiveRequest(DataUnit userData);
+
+    void syncMinorRequest(int type, int dataSeparation,
+                          int firstSPSerialNumber, DataUnit userdata);
+
+    void syncMinorResponse(int firstSPSerialNumber, DataUnit userData);
+
+    void syncMajorRequest(int firstSPSerialNumber, DataUnit userdata);
+
+    void syncMajorResponse(int secondSPSerialNumber, DataUnit userData);
+
+    void resynchronizeRequest(int firstResynchronizeType,
+                              int firstSPSerialNumber, int secondResynchronizeType,
+                              int secondSPSerialNumber, int assignmentOfTokens, DataUnit userdata);
+
+    void resynchronizeResponse(int firstResynchronizeType,
+                               int firstSPSerialNumber, int secondResynchronizeType,
+                               int secondSPSerialNumber, int assignmentOfTokens, DataUnit userdata);
+
+    void userExceptionReportRequest(int reason, DataUnit userData);
+
+    void activityStartRequest(int activityIdentifier, DataUnit userData);
+
+    void activityResumeRequest(int activityIdentifier,
+                               int oldActivityIdentifier, int firstSPSerialNumber,
+                               int secondSPSerialNumber, int oldSessionConnectionIdentifier,
+                               DataUnit userData);
+
+    void activityInterruptRequest(DataUnit userData);
+
+    void activityInterruptResponse(int reason, DataUnit userData);
+
+    void activityDiscardRequest(int reason, DataUnit userData);
+
+    void activityDiscardResponse(DataUnit userData);
+
+    void activityEndRequest(int firstSPSerialNumber, DataUnit userData);
+
+    void activityEndResponse(int secondSPSerialNumber, DataUnit userData);
+
+    void releaseRequest(DataUnit userData);
+
+    void releaseResponse(int result, DataUnit userData);
+
+    void userAbortRequest(DataUnit userData);
+}

src/main/java/de/thpeetz/network/osi/session/SessionService.java

@@ -0,0 +1,160 @@
+package de.thpeetz.network.osi.session;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public interface SessionService
+{
+    // category 0
+    /**
+     * GIVE TOKEN SPDU
+     */
+    byte GT_SPDU = 0x01;
+    /**
+     * PLEASE TOKEN SPDU
+     */
+    byte PT_SPDU = 0x02;
+
+    // category 1
+    /**
+     * CONNECT SPDU
+     */
+    byte CN_SPDU = 0x0D;
+    /**
+     * OVERFLOW ACCEPT SPDU
+     */
+    byte OA_SPDU = 0x10;
+    /**
+     * CONNECT DATA OVERFLOW SPDU
+     */
+    byte CDO_SPDU = 0x0F;
+    /**
+     * ACCEPT SPDU
+     */
+    byte AC_SPDU = 0x0E;
+    /**
+     * REFUSE SPDU
+     */
+    byte RF_SPDU = 0x0C;
+    /**
+     * FINISH SPDU
+     */
+    byte FN_SPDU = 0x09;
+    /**
+     * DISCONNECT SPDU
+     */
+    byte DN_SPDU = 0x0A;
+    /**
+     * NOT FINISHED SPDU
+     */
+    byte NF_SPDU = 0x08;
+    /**
+     * ABORT SPDU
+     */
+    byte AB_SPDU = 0x19;
+    /**
+     * ABORT ACCEPT SPDU
+     */
+    byte AA_SPDU = 0x1A;
+    /**
+     * GIVE TOKENS CONFIRM SPDU
+     */
+    byte GTC_SPDU = 0x15;
+    /**
+     * GIVE TOKEN ACK SPDU
+     */
+    byte GTA_SPDU = 0x16;
+    /**
+     * PREPARE SPDU
+     */
+    byte PR_SPDU = 0x07;
+    /**
+     * TYPED DATA SPDU
+     */
+    byte TD_SPDU = 0x21;
+
+    // category 2
+
+    /**
+     * DATA TRANSFER SPDU
+     */
+    byte DT_SPDU = 0x01;
+    /**
+     * MINOR SYNC POINT SPDU
+     */
+    byte MIP_SPDU = 0x31;
+    /**
+     * MINOR SYNC ACK SPDU
+     */
+    byte MIA_SPDU = 0x32;
+    /**
+     * MAJOR SYNC POINT SPDU
+     */
+    byte MAP_SPDU = 0x29;
+    /**
+     * MAJOR SYNC ACK SPDU
+     */
+    byte MAA_SPDU = 0x2A;
+    /**
+     * RESYNCHRONIZE SPDU
+     */
+    byte RS_SPDU = 0x35;
+    /**
+     * RESYNCHRONIZE ACK SPDU
+     */
+    byte RA_SPDU = 0x22;
+    /**
+     * ACTIVITY START SPDU
+     */
+    byte AS_SPDU = 0x2D;
+    /**
+     * ACTIVITY RESUME SPDU
+     */
+    byte AR_SPDU = 0x1D;
+    /**
+     * ACTIVITY DISCARD SPDU
+     */
+    byte AD_SPDU = 0x39;
+    /**
+     * ACTIVITY DISCARD ACK SPDU
+     */
+    byte ADA_SPDU = 0x3A;
+    /**
+     * ACTIVITY INTERRUPT SPDU
+     */
+    byte AI_SPDU = 0x19;
+    /**
+     * ACTIVITY INTERRUPT ACK SPDU
+     */
+    byte AIA_SPDU = 0x1A;
+    /**
+     * ACTIVITY END SPDU
+     */
+    byte AE_SPDU = 0x29;
+    /**
+     * ACTIVITY END ACK
+     */
+    byte AEA_SPDU = 0x2A;
+    /**
+     * CAPABILITY DATA SPDU
+     */
+    byte CD_SPDU = 0x3D;
+    /**
+     * CAPABILITY DATA ACK SPDU
+     */
+    byte CDA_SPDU = 0x3E;
+    /**
+     * EXCEPTION REPORT SPDU
+     */
+    byte ER_SPDU = 0x00;
+    /**
+     * EXCEPTION DATA SPDU
+     */
+    byte ED_SPDU = 0x30;
+
+    /**
+     * EXPEDITED SPDU
+     */
+    byte EX_SPDU = 0x05;
+}

src/main/java/de/thpeetz/network/osi/session/SessionUser.java

@@ -0,0 +1,87 @@
+package de.thpeetz.network.osi.session;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * @author Thomas Peetz
+ * 
+ */
+public interface SessionUser extends SessionService
+{
+    void connectIndication(int connectionIdentifier,
+                           AccessPoint callingAddress, AccessPoint calledAddress,
+                           int qualityOfService, int sessionRequirements,
+                           int firstSPSerialNumber, int secondSPSerialNumber,
+                           int assignmentOfTokens, DataUnit userData);
+
+    void connectConfirm(int connectionIdentifier,
+                        AccessPoint respondingAddress, int result, int qualityOfService,
+                        int sessionRequirements, int firstSPSerialNumber,
+                        int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData);
+
+    void dataIndication(DataUnit userData);
+
+    void expeditedDataIndication(DataUnit userData);
+
+    void typedDataIndication(DataUnit userData);
+
+    void capabilityDataIndication(DataUnit userData);
+
+    void capabilityDataConfirm(DataUnit userData);
+
+    void tokenGiveIndication(int tokens, DataUnit userData);
+
+    void tokenPleaseIndication(int tokens, DataUnit userData);
+
+    void controlGiveIndication(DataUnit userData);
+
+    void syncMinorIndication(int type, int dataSeparation,
+                             int firstSPSerialNumber, DataUnit userData);
+
+    void syncMinorConfirm(int firstSPSerialNumber, DataUnit userData);
+
+    void syncMajorIndication(int firstSPSerialNumber, DataUnit userData);
+
+    void syncMajorConfirm(int secondSPSerialNumber, DataUnit userData);
+
+    void resynchronizeIndication(int firstResynchronizeType,
+                                 int firstSPSerialNumber, int secondResynchronizeType,
+                                 int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData);
+
+    void resynchronizeConfirm(int firstResynchronizeType,
+                              int firstSPSerialNumber, int secondResynchronizeType,
+                              int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData);
+
+    void providerExceptionReportIndication(int reason);
+
+    void userExceptionReportIndication(int reason, DataUnit userData);
+
+    void activityStartIndication(int activityIdentifier,
+                                 DataUnit userData);
+
+    void activityResumeIndication(int activityIdentifier,
+                                  int oldActivityIdentifier, int firstSPSerialNumber,
+                                  int secondSPSerialNumber, int oldSessionConnectionIdentifier,
+                                  DataUnit userData);
+
+    void activityInterruptIndication(DataUnit userData);
+
+    void activityInterruptConfirm(int reason, DataUnit userData);
+
+    void activityDiscardIndication(int reason, DataUnit userData);
+
+    void activityDiscardConfirm(DataUnit userData);
+
+    void activityEndIndication(int firstSPSerialNumber, DataUnit userData);
+
+    void activityEndConfirm(int secondSPSerialNumber, DataUnit userData);
+
+    void releaseIndication(DataUnit userData);
+
+    void releaseConfirm(int result, DataUnit userData);
+
+    void userAbortIndication(DataUnit userData);
+
+    void providerAbortIndication(int reason, DataUnit userData);
+}

src/main/java/de/thpeetz/network/osi/transport/DataService.java

@@ -0,0 +1,24 @@
+package de.thpeetz.network.osi.transport;
+
+import de.thpeetz.network.osi.DataUnit;
+
+public interface DataService
+{
+    /**
+     * 
+     * @param telegram
+     */
+    void eventReceive(DataUnit telegram);
+
+    /**
+     * eventSessionDown
+     *
+     */
+    void eventSessionDown();
+
+    /**
+     * 
+     *
+     */
+    void eventClose();
+}

src/main/java/de/thpeetz/network/osi/transport/RFC1006Service.java

@@ -0,0 +1,102 @@
+package de.thpeetz.network.osi.transport;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public class RFC1006Service {
+    public static final int RFC1006PORT = 102;
+
+    private boolean manager = false;
+
+    @SuppressWarnings("unused")
+    private boolean serverRun = true;
+
+    private Socket socket;
+
+    private TransportUser user;
+
+    Logger logger;
+
+	/**
+	 * Construct instance of RFC1006Service. This connects OSI-stack to sockets.
+	 * @param manager This value ist true when the stack is in manager mode.
+	 * @param user Reference to upper layer.
+	 */
+    public RFC1006Service(boolean manager, TransportUser user) {
+        this.manager = manager;
+        this.user = user;
+        if (this.manager) {
+            // TODO start socket in server mode
+        }
+        logger = Logger.getLogger(RFC1006Service.class.getName());
+    }
+
+    public void close() {
+        this.serverRun = false;
+    }
+
+	public void listen() {
+		try (ServerSocket server = new ServerSocket()) {
+			server.bind(new InetSocketAddress("127.0.0.1", RFC1006PORT));
+			server.accept();
+			System.out.println("127.0.0.1:102 accepted");
+		} catch (IOException e) {
+		    logger.log(Level.FINE, e.getMessage());
+		}
+	}
+	
+	public void connect(AccessPoint calledNSAP, DataUnit userData) {
+        try {
+            final String host = new String(calledNSAP.getData());
+            //System.out.println("opening connection on " + host + " port " + rfc1006Port);
+
+            // Opening a socket connection may require to leave the sandbox.
+            socket = (Socket)AccessController.doPrivileged(new PrivilegedAction<Object>() {
+                public Object run() {
+                    Object result = null;
+
+                    try {
+                        result = new Socket(host, RFC1006PORT);
+                    } catch (UnknownHostException exUnknownHost) {
+                    } catch (IOException exIO) {
+                    }
+
+                    return result;
+                }
+            });
+
+            if (socket != null) {
+//                receiveQueue = new TelegramReceiveThread(socket, this);
+//                receiveQueue.start();
+//                sendQueue = new TelegramSendThread(socket, this);
+//                sendQueue.start();
+                userData.write((byte)userData.getLength());
+//                writeRFC1006Header(userData);
+//                sendQueue.pushTelegram(userData);
+            } else {
+            	user.disconnectIndication(1, null);
+//                eventSessionDown();
+            }
+        }
+//
+//        catch (IOException exIO)
+//        {
+//            eventSessionDown();
+//        }
+        finally { }
+    }
+}

src/main/java/de/thpeetz/network/osi/transport/TransportLayer.java

@@ -0,0 +1,213 @@
+package de.thpeetz.network.osi.transport;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.session.SessionUser;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public class TransportLayer extends TransportService implements TransportProvider, TransportUser {
+    /**
+     *
+     */
+    private SessionUser user;
+
+    /**
+     *
+     */
+    private RFC1006Service service;
+
+    /**
+     *
+     */
+    @SuppressWarnings("unused")
+    private AccessPoint tsap;
+
+    /**
+     * Only constructor for TransportLayer.
+     * @param manager Should the stack be in manager or agent mode?
+     * @param user Reference to upper layer
+     * @param tsap address of transport layer
+     */
+    public TransportLayer(final boolean manager, final SessionUser user, final AccessPoint tsap) {
+        this.user = user;
+        this.service = new RFC1006Service(manager, this);
+        this.tsap = tsap;
+    }
+
+    /**
+     * Request to open a connection to peer transport layer.
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportProvider#connectRequest
+     *            (de.thpeetz.network.osi.peetz.network.osi.AccessPoint, de.thpeetz.network.osi.peetz.network.osi.AccessPoint,
+     *             de.thpeetz.network.osi.peetz.network.osi.AccessPoint, boolean, int, de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param calledNSAP NSAP address of peer network layer
+     * @param calledTSAP TSAP address of peer transport layer
+     * @param callerTSAP TSAP address of this transport layer
+     * @param expeditedDataOption expedited data mode?
+     * @param qualityOfService mode of QoS?
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void connectRequest(final AccessPoint calledNSAP, final AccessPoint calledTSAP,
+        final AccessPoint callerTSAP, final boolean expeditedDataOption,
+        final int qualityOfService, final DataUnit userData) {
+        System.out.println("TransportLayer#connectRequest");
+        userData.write(calledTSAP.getData());
+        userData.write(calledTSAP.getLength());
+        userData.write((byte) 0xc2);
+        userData.write(callerTSAP.getData());
+        userData.write(callerTSAP.getLength());
+        userData.write((byte) 0xc1);
+        userData.write((byte) 0x0f);
+        userData.write((byte) 0x01);
+        userData.write((byte) 0xc0);
+        userData.write((byte) 0x00); // class option
+        userData.write(1); // src-ref
+        userData.write(0); // dst-ref
+        userData.write((byte) 0xe0);
+        service.connect(calledNSAP, userData);
+    }
+
+    /**
+     * This message is sent when a requested connection is established.
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportProvider#connectResponse
+     *            (int, de.thpeetz.network.osi.peetz.network.osi.AccessPoint, boolean, de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param respondingAddress
+     *            The parameter usually matches the called address.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void connectResponse(final int qualityOfService,
+        final AccessPoint respondingAddress, final boolean expeditedDataOption,
+        final DataUnit userData) {
+        System.out.println("TransportLayer#connectResponse");
+    }
+
+    /**
+     * Request disconnect from peer.
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportProvider#disconnectRequest(de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void disconnectRequest(final DataUnit userData) {
+        System.out.println("TransportLayer#disconnectRequest");
+        byte[] drTpdu = new byte[7];
+        drTpdu[0] = (byte) 0x06;
+        drTpdu[1] = (byte) 0xC0;
+        drTpdu[2] = (byte) 0x00;
+        drTpdu[3] = (byte) 0x00;
+        drTpdu[4] = (byte) 0x00;
+        drTpdu[5] = (byte) 0x01;
+        drTpdu[6] = (byte) 0x00;
+        userData.setToWrite();
+        userData.write(drTpdu);
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportProvider#dataRequest(de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void dataRequest(final DataUnit userData) {
+        System.out.println("TransportLayer#dataRequest");
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportProvider#expeditedDataRequest(de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void expeditedDataRequest(final DataUnit userData) {
+        System.out.println("TransportLayer#expeditedDataRequest");
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportUser#connectConfirm
+     *            (int, de.thpeetz.network.osi.peetz.network.osi.AccessPoint, boolean, de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param respondingAddress
+     *            The parameter usually matches the called address.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void connectConfirm(final int qualityOfService,
+        final AccessPoint respondingAddress, final boolean expeditedDataOption,
+        final DataUnit userData) {
+        this.user.connectConfirm(1, respondingAddress, 1, qualityOfService, 1, 1, 1, 1, userData);
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportUser#connectIndication
+     *            (de.thpeetz.network.osi.peetz.network.osi.AccessPoint,
+     *             de.thpeetz.network.osi.peetz.network.osi.AccessPoint, boolean, int, de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param calledAddress
+     *            The parameter usually matches the called address.
+     * @param callingAddress
+     *            The parameter usually matches the callers address.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void connectIndication(final AccessPoint calledAddress,
+        final AccessPoint callingAddress, final boolean expeditedDataOption,
+        final int qualityOfService, final DataUnit userData) {
+        this.user.connectIndication(1, callingAddress, calledAddress, qualityOfService, 1, 1, 1, 1, userData);
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportUser#disconnectIndication(int, de.thpeetz.network.osi.DataUnit)
+     * @param disconnectReason
+     *            Gives reason for disconnecting.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void disconnectIndication(final int disconnectReason, final DataUnit userData) {
+        this.user.releaseIndication(userData);
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportUser#dataIndication(de.thpeetz.network.osi.DataUnit)
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void dataIndication(final DataUnit userData) {
+        this.user.dataIndication(userData);
+    }
+
+    /**
+     * @see de.thpeetz.network.osi.transport.peetz.network.osi.transport.TransportUser#expeditedDataIndication(de.thpeetz.network.osi.peetz.network.osi.DataUnit)
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    public final void expeditedDataIndication(final DataUnit userData) {
+        this.user.expeditedDataIndication(userData);
+    }
+}

src/main/java/de/thpeetz/network/osi/transport/TransportProvider.java

@@ -0,0 +1,74 @@
+package de.thpeetz.network.osi.transport;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * Methods provided by transport layer. Interface to upper layer.
+ * @author Thomas Peetz
+ */
+public interface TransportProvider {
+    /**
+     * Request a connection to corresponding transport layer peer.
+     * @param calledNSAP
+     *            NSAP address to be called.
+     * @param calledTSAP
+     *            TSAP address to be called.
+     * @param callerTSAP
+     *            TSAP address of connection requester.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void connectRequest(AccessPoint calledNSAP, AccessPoint calledTSAP,
+            AccessPoint callerTSAP, boolean expeditedDataOption,
+            int qualityOfService, DataUnit userData);
+
+    /**
+     * Confirm a requested connection.
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param respondingAddress
+     *            The parameter usually matches the called address.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void connectResponse(int qualityOfService,
+            AccessPoint respondingAddress, boolean expeditedDataOption,
+            DataUnit userData);
+
+    /**
+     * Request a disconnect from peer.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void disconnectRequest(DataUnit userData);
+
+    /**
+     * Send message to peer.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void dataRequest(DataUnit userData);
+
+    /**
+     * Send message to peer.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void expeditedDataRequest(DataUnit userData);
+}

src/main/java/de/thpeetz/network/osi/transport/TransportService.java

@@ -0,0 +1,48 @@
+package de.thpeetz.network.osi.transport;
+
+/**
+ * Definitions for transport layer.
+ * @author Thomas Peetz
+ */
+public abstract class TransportService {
+    /**
+     * Connection Request TPDU.
+     */
+     public static final int CR_TPDU = 0xE0;
+     /**
+      * Connection Confirm TPDU.
+      */
+     public static final int CC_TPDU = 0xD0;
+     /**
+      * Disconnect Request TPDU.
+      */
+     public static final int DR_TPDU = 0x80;
+     /**
+      *  Disconnect Confirm TPDU.
+      */
+     public static final int DC_TPDU = 0xC0;
+     /**
+      *  Data TPDU.
+      */
+     public static final int DT_TPDU = 0xF0;
+     /**
+      *  Expedited Data TPDU.
+      */
+     public static final int ED_TPDU = 0x10;
+     /**
+      *  Data Acknowledge TPDU.
+      */
+     public static final int AK_TPDU = 0x60;
+     /**
+      *  Expedited Acknowledge TPDU.
+      */
+     public static final int EA_TPDU = 0x20;
+     /**
+      *  Reject TPDU.
+      */
+     public static final int RJ_TPDU = 0x50;
+     /**
+      *  Error TPDU.
+      */
+     public static final int ER_TPDU = 0x70;
+}

src/main/java/de/thpeetz/network/osi/transport/TransportUser.java

@@ -0,0 +1,78 @@
+package de.thpeetz.network.osi.transport;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+/**
+ * @author Thomas Peetz
+ *
+ */
+public interface TransportUser {
+    /**
+     * connectConfirm.
+     *
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param respondingAddress
+     *            The parameter usually matches the called address.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void connectConfirm(int qualityOfService,
+            AccessPoint respondingAddress, boolean expeditedDataOption,
+            DataUnit userData);
+
+    /**
+     * connectIndication.
+     *
+     * @param calledAddress
+     *            The calledAddress parameter conveyes the address of the TSAP
+     *            to which the connection is to be established.
+     * @param callingAddress
+     *            The callingAddress parameter conveyes the address of the TSAP
+     *            from which the connection has been requested.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void connectIndication(AccessPoint calledAddress,
+            AccessPoint callingAddress, boolean expeditedDataOption,
+            int qualityOfService, DataUnit userData);
+
+    /**
+     * disconnectindication.
+     * @param disconnectReason
+     *            Gives reason for disconnecting.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void disconnectIndication(int disconnectReason, DataUnit userData);
+
+    /**
+     * Receives data from peer.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void dataIndication(DataUnit userData);
+
+    /**
+     * expeditedDataIndication.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void expeditedDataIndication(DataUnit userData);
+}

src/main/java/de/thpeetz/network/osi/transport/User.java

@@ -0,0 +1,25 @@
+package de.thpeetz.network.osi.transport;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+
+public interface User {
+    /**
+     * connectConfirm.
+     *
+     * @param qualityOfService
+     *            The qualityOfService parameter describes the possible
+     *            quality of service value.
+     * @param respondingAddress
+     *            The parameter usually matches the called address.
+     * @param expeditedDataOption
+     *            The expeditedDataOption parameter indicates wether the
+     *            expedited data option is to be available on the connection.
+     * @param userData
+     *            This parameter allows the transfer of user-data between users
+     *            without modification by the transport service provider.
+     */
+    void connectConfirm(int qualityOfService,
+            AccessPoint respondingAddress, boolean expeditedDataOption,
+            DataUnit userData);
+}

src/main/java/de/thpeetz/tools/ObjectPool.java

@@ -0,0 +1,97 @@
+package de.thpeetz.tools;
+
+import java.util.Vector;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import de.thpeetz.network.osi.transport.RFC1006Service;
+
+/**
+ * @author Thomas Peetz
+ *
+ * @param <T> type of objects in ObjectPool
+ */
+public class ObjectPool<T> {
+    /**
+     * Vector of unused object references.
+     */
+    private final Vector<T> freeStack;
+
+    Logger logger;
+
+    /**
+     * Construct an object pool for a specific class type.
+     *
+     * @param clazz
+     *            Class type of object pool
+     * @throws IllegalAccessException
+     * @throws InstantiationException
+     */
+    public ObjectPool(final Class<T> clazz) {
+        this.freeStack = new Vector<T>();
+        init(clazz);
+        logger = Logger.getLogger(ObjectPool.class.getName());
+
+    }
+
+    /**************************************************************************
+     * Construct an object pool for a specific class type. Initialize object
+     * pool with given number of objects.
+     *
+     * @param clazz
+     *            Class type of object pool
+     * @param size
+     *            Initial number of objects in pool
+     * @throws IllegalAccessException
+     * @throws InstantiationException
+     ***************************************************************************/
+    public ObjectPool(final Class<T> clazz, final int size) {
+        this.freeStack = new Vector<T>(size);
+        init(clazz);
+    }
+
+    /**************************************************************************
+     * Construct an object pool for a specific class type. Initialize object
+     * pool with number of objects equal to stack size.
+     *
+     * @param clazz
+     *            Class type of object pool
+     ***************************************************************************/
+    private void init(final Class<T> clazz) {
+        for (int i = 0; i < freeStack.capacity(); i++) {
+            try {
+                freeStack.add(i, clazz.newInstance());
+            } catch (InstantiationException e) {
+                logger.log(Level.FINE, e.getMessage());
+            } catch (IllegalAccessException e) {
+                logger.log(Level.FINE, e.getMessage());
+            }
+        }
+    }
+
+    /**
+     * Get instance from object pool.
+     *
+     * @return Reference of object
+     */
+    public final synchronized T getInstance() {
+        // Check if the pool is empty.
+        if (this.freeStack.isEmpty()) {
+            return null;
+        }
+        // Remove object from end of free pool.
+        T result = this.freeStack.lastElement();
+        this.freeStack.setSize(this.freeStack.size() - 1);
+        return result;
+    }
+
+    /**************************************************************************
+     * Return object to object pool.
+     *
+     * @param obj
+     *            Reference of unsed object
+     ***************************************************************************/
+    public final synchronized void freeInstance(final T obj) {
+        this.freeStack.addElement(obj);
+    }
+}

src/test/java/com/ibtp/network/osi/LibraryTest.java

@@ -1,14 +0,0 @@
-/*
- * This Java source file was generated by the Gradle 'init' task.
- */
-package com.ibtp.network.osi;
-
-import org.junit.Test;
-import static org.junit.Assert.*;
-
-public class LibraryTest {
-    @Test public void testSomeLibraryMethod() {
-        Library classUnderTest = new Library();
-        assertTrue("someLibraryMethod should return 'true'", classUnderTest.someLibraryMethod());
-    }
-}

src/test/java/de/thpeetz/network/osi/AccessPointTest.java

@@ -0,0 +1,45 @@
+package de.thpeetz.network.osi;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+public class AccessPointTest {
+
+	@Test
+	void testAccessPoint() {
+		AccessPoint ap = new AccessPoint();
+		assertNotNull(ap);
+	}
+
+	@Test
+	void testAccessPointString() {
+		AccessPoint ap = new AccessPoint("ap12");
+		assertEquals("ap12", ap.getString());
+	}
+
+	@Test
+	void testGetString() {
+		AccessPoint ap = new AccessPoint("ap12");
+		assertEquals("ap12", ap.getString());
+	}
+
+	@Test
+    void testGetData() {
+    	AccessPoint ap = new AccessPoint("ap12");
+    	assertEquals(4, ap.getData().length);
+    	byte[] expected = {97, 112, 49,50};
+    	int i=0;
+    	for (byte b : expected) {
+        	assertEquals(b, ap.getData()[i]);
+        	i++;
+		}
+    }
+
+	@Test
+	void testGetLength() {
+		AccessPoint ap = new AccessPoint("ap12");
+		assertEquals(4, ap.getData().length);
+	}
+}

src/test/java/de/thpeetz/network/osi/DataUnitManagerTest.java

@@ -0,0 +1,56 @@
+package de.thpeetz.network.osi;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author tpeetz
+ * 
+ */
+public class DataUnitManagerTest {
+
+    /**
+     * Test method for
+     * {@link de.thpeetz.network.osi.DataUnitManager#DataUnitManager()}.
+     */
+    @Test
+    public void testDataUnitManager() {
+        DataUnitManager manager = new DataUnitManager();
+        assertNotNull(manager);
+    }
+
+    /**
+     * Test method for
+     * {@link de.thpeetz.network.osi.DataUnitManager#getManager()}.
+     */
+    @Test
+    public void testGetManager() {
+        DataUnitManager manager = DataUnitManager.getManager();
+        assertNotNull(manager);
+    }
+
+    /**
+     * Test method for
+     * {@link de.thpeetz.network.osi.DataUnitManager#getInstance()}.
+     */
+    @Test
+    public void testGetInstance() {
+        DataUnit unit = DataUnitManager.getInstance();
+        assertNotNull(unit);
+    }
+
+    /**
+     * Test method for
+     * {@link de.thpeetz.network.osi.DataUnitManager#freeInstance(de.thpeetz.network.osi.DataUnit)}
+     * .
+     */
+    @Test
+    @Disabled
+    public void testFreeInstance() {
+        DataUnit unit = DataUnitManager.getInstance();
+        assertNotNull(unit);
+        DataUnitManager.freeInstance(unit);
+    }
+}

src/test/java/de/thpeetz/network/osi/DataUnitTest.java

@@ -0,0 +1,148 @@
+package de.thpeetz.network.osi;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+public class DataUnitTest{
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.DataUnit()'
+     */
+    @Test
+    public void testDataUnit() {
+        DataUnit data = new DataUnit();
+        assertNotNull(data);
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.initialize(byte[])'
+     */
+    @Test
+    public void testInitializeByteArray() {
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.initialize()'
+     */
+    @Test
+    public void testInitialize() {
+        DataUnit data = new DataUnit();
+        data.initialize();
+        assertEquals(0, data.getLength());
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.addBuffer(byte[])'
+     */
+    @Test
+    public void testAddBuffer() {
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.setToWrite()'
+     */
+    @Test
+    public void testSetToWrite() {
+        DataUnit data = new DataUnit();
+        data.setToWrite();
+        assertEquals(data.getLength(), 0);
+        data.write(3);
+        assertEquals(data.getLength(), 2);
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.setToRead()'
+     */
+    @Test
+    public void testSetToRead() {
+        DataUnit data = new DataUnit();
+        data.setToRead();
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.write(byte[])'
+     */
+    @Test
+    public void testWriteByteArray() {
+        DataUnit data = new DataUnit();
+        data.setToWrite();
+        assertEquals(data.getLength(), 0);
+        data.write(new byte[]{ (byte) 0x01, (byte) 0x03});
+        assertEquals(2, data.getLength());
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.write(byte)'
+     */
+    @Test
+    public void testWriteByte() {
+        DataUnit data = new DataUnit();
+        data.setToWrite();
+        assertEquals(data.getLength(), 0);
+        data.write( (byte) 0x05);
+        assertEquals(1, data.getLength());
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.write(int)'
+     */
+    @Test
+    public void testWriteInt() {
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.read()'
+     */
+    @Test
+    public void testRead() {
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.read(int)'
+     */
+    @Test
+    public void testReadInt() {
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.readInt()'
+     */
+    @Test
+    public void testReadInt1() {
+        DataUnit data = new DataUnit();
+        data.setToWrite();
+        data.write(5);
+        assertEquals(data.readInt(), 5);
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.getBuffer()'
+     */
+    @Test
+    public void testGetBuffer() {
+        DataUnit data = new DataUnit();
+        byte[] buffer = data.getBuffer();
+        assertNotNull(buffer);
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.getBuffer(int)'
+     */
+    @Test
+    public void testGetBufferInt() {
+        DataUnit data = new DataUnit();
+        byte[] buffer = data.getBuffer(3);
+        assertEquals(buffer.length, 3);
+    }
+
+    /*
+     * Test method for 'com.peetz.network.osi.DataUnit.getLength()'
+     */
+    @Test
+    public void testGetLength() {
+        DataUnit data = new DataUnit();
+        assertEquals(data.getLength(), 0);
+    }
+}

src/test/java/de/thpeetz/network/osi/OsiTests.java

@@ -0,0 +1,9 @@
+package de.thpeetz.network.osi;
+
+public class OsiTests
+{
+	public static AccessPoint calledNSAP = new AccessPoint("127.0.0.1");
+	public static AccessPoint calledTSAP = new AccessPoint("tl2");
+	public static AccessPoint callerTSAP = new AccessPoint("tl1");
+	public static AccessPoint callerSSAP = new AccessPoint("sl1");
+}

src/test/java/de/thpeetz/network/osi/presentation/PresentationLayerTest.java

@@ -0,0 +1,445 @@
+package de.thpeetz.network.osi.presentation;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.DataUnitManager;
+import de.thpeetz.network.osi.OsiTests;
+
+public class PresentationLayerTest {
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.PresentationLayer()'
+     */
+    @Test
+    public final void testPresentationLayer() {
+        PresentationLayer layer = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        assertNotNull(layer);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.connectRequest(AccessPoint,
+     * AccessPoint, AccessPoint, AccessPoint, AccessPoint, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectRequest() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        assertNotNull(presentation);
+        DataUnit data = DataUnitManager.getInstance();
+        assertNotNull(data);
+        presentation.connectRequest(OsiTests.calledNSAP, OsiTests.calledTSAP,
+                null, null, null, 1, data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.releaseRequest(DataUnit)'
+     */
+    @Test
+    public final void testReleaseRequest() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        presentation.releaseRequest(data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.dataRequest(DataUnit)'
+     */
+    @Test
+    public final void testDataRequest() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.dataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.userAbortRequest(DataUnit)'
+     */
+    @Test
+    public final void testUserAbortRequest() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        presentation.userAbortRequest(data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.connectIndication(AccessPoint,
+     * AccessPoint, int, int, int, int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.connectIndication(null, null, 1, 1, 1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.connectConfirm(AccessPoint,
+     * int, int, int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.connectConfirm(null, 1, 1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.userAbortIndication(DataUnit)'
+     */
+    @Test
+    public final void testUserAbortIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.userAbortIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.providerAbortIndication(int)'
+     */
+    @Test
+    public final void testProviderAbortIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.providerAbortIndication(1);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.alterContextIndication(int,
+     * int, int, DataUnit)'
+     */
+    @Test
+    public final void testAlterContextIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.alterContextIndication(1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.alterContextConfirm(int,
+     * int, DataUnit)'
+     */
+    @Test
+    public final void testAlterContextConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.alterContextConfirm(1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.typedDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testTypedDataIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.typedDataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.dataIndication(DataUnit)'
+     */
+    @Test
+    public final void testDataIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.dataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.resynchronizeIndication(int,
+     * int, int, DataUnit)'
+     */
+    @Test
+    public final void testResynchronizeIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.resynchronizeIndication(1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.resynchronizeConfirm(int,
+     * int, DataUnit)'
+     */
+    @Test
+    public final void testResynchronizeConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.resynchronizeConfirm(1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityStartIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityStartIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityStartIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityResumeIndication(int,
+     * int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testActivityResumeIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityResumeIndication(1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityInterruptIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityInterruptIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityInterruptIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityInterruptConfirm(DataUnit)'
+     */
+    @Test
+    public final void testActivityInterruptConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityInterruptConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityDiscardIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityDiscardIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityDiscardIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityDiscardConfirm(DataUnit)'
+     */
+    @Test
+    public final void testActivityDiscardConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityDiscardConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityEndIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityEndIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityEndIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.activityEndConfirm(DataUnit)'
+     */
+    @Test
+    public final void testActivityEndConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.activityEndConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.capabilityDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testCapabilityDataIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.capabilityDataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.capabilityDataConfirm(DataUnit)'
+     */
+    @Test
+    public final void testCapabilityDataConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.capabilityDataConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.controlGiveIndication(DataUnit)'
+     */
+    @Test
+    public final void testControlGiveIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.controlGiveIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.tokenGiveIndication(DataUnit)'
+     */
+    @Test
+    public final void testTokenGiveIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.tokenGiveIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.tokenPleaseIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testTokenPleaseIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.tokenPleaseIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.userExceptionReportIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testUserExceptionReportIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.userExceptionReportIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.providerExceptionReportIndication(int)'
+     */
+    @Test
+    public final void testProviderExceptionReportIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.providerExceptionReportIndication(1);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.expeditedDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testExpeditedDataIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.expeditedDataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.syncMinorIndication(int,
+     * int, DataUnit)'
+     */
+    @Test
+    public final void testSyncMinorIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.syncMinorIndication(1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.syncMinorConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMinorConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.syncMinorConfirm(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.syncMajorIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMajorIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.syncMajorIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.syncMajorConfirm(DataUnit)'
+     */
+    @Test
+    public final void testSyncMajorConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.syncMajorConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.releaseIndication(DataUnit)'
+     */
+    @Test
+    public final void testReleaseIndication() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.releaseIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.presentation.PresentationLayer.releaseConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testReleaseConfirm() {
+        PresentationLayer presentation = new PresentationLayer(false,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        presentation.releaseConfirm(1, null);
+    }
+}

src/test/java/de/thpeetz/network/osi/session/PresentationMockObject.java

@@ -0,0 +1,153 @@
+package de.thpeetz.network.osi.session;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.presentation.PresentationUser;
+
+public class PresentationMockObject implements PresentationUser
+{
+
+	public void connectIndication(AccessPoint callingAddress,
+			AccessPoint calledAddress, int qualityOfService,
+			int representationRequirements, int mode, int sessionRequirements,
+			int initialSPSerialNumber, int assignmentOfTokens,
+			int sessionConnectionIdentifier, DataUnit userData)
+	{
+	}
+
+	public void connectConfirm(AccessPoint respondingAddress,
+			int qualityOfService, int representationRequirements,
+			int sessionRequirements, int initialSPSerialNumber,
+			int assignmentOfTokens, int sessionConnectionIdentifier,
+			DataUnit userData)
+	{
+	}
+
+	public void userAbortIndication(DataUnit userData)
+	{
+	}
+
+	public void providerAbortIndication(int providerReason)
+	{
+	}
+
+	public void alterContextIndication(int additionList, int deletionList,
+			int additionResultList, DataUnit userData)
+	{
+	}
+
+	public void alterContextConfirm(int additionResultList,
+			int deletionResultList, DataUnit userData)
+	{
+	}
+
+	public void typedDataIndication(DataUnit userData)
+	{
+	}
+
+	public void dataIndication(DataUnit userData)
+	{
+	}
+
+	public void resynchronizeIndication(int type, int sPSerialNumber,
+			int tokens, DataUnit userData)
+	{
+	}
+
+	public void resynchronizeConfirm(int sPSerialNumber, int tokens,
+			DataUnit userData)
+	{
+	}
+
+	public void activityStartIndication(int activityIdentifier,
+			DataUnit userData)
+	{
+	}
+
+	public void activityResumeIndication(int activityIdentifier,
+			int oldActivityIdentifier, int sPSerialNumber,
+			int oldSessionIdentifier, DataUnit userData)
+	{
+	}
+
+	public void activityInterruptIndication(int reason, DataUnit userData)
+	{
+	}
+
+	public void activityInterruptConfirm(DataUnit userData)
+	{
+	}
+
+	public void activityDiscardIndication(int reason, DataUnit userData)
+	{
+	}
+
+	public void activityDiscardConfirm(DataUnit userData)
+	{
+	}
+
+	public void activityEndIndication(int sPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void activityEndConfirm(DataUnit userData)
+	{
+	}
+
+	public void capabilityDataIndication(DataUnit userData)
+	{
+	}
+
+	public void capabilityDataConfirm(DataUnit userData)
+	{
+	}
+
+	public void controlGiveIndication(DataUnit userData)
+	{
+	}
+
+	public void tokenGiveIndication(DataUnit userData)
+	{
+	}
+
+	public void tokenPleaseIndication(int tokens, DataUnit userData)
+	{
+	}
+
+	public void userExceptionReportIndication(int reason, DataUnit userData)
+	{
+	}
+
+	public void providerExceptionReportIndication(int reason)
+	{
+	}
+
+	public void expeditedDataIndication(DataUnit userData)
+	{
+	}
+
+	public void syncMinorIndication(int type, int sPSerialNumber,
+			DataUnit userData)
+	{
+	}
+
+	public void syncMinorConfirm(int sPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void syncMajorIndication(int sPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void syncMajorConfirm(DataUnit userData)
+	{
+	}
+
+	public void releaseIndication(DataUnit userData)
+	{
+	}
+
+	public void releaseConfirm(int result, DataUnit userData)
+	{
+	}
+}

src/test/java/de/thpeetz/network/osi/session/SessionLayerTest.java

@@ -0,0 +1,706 @@
+package de.thpeetz.network.osi.session;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.DataUnitManager;
+import de.thpeetz.network.osi.OsiTests;
+import de.thpeetz.network.osi.presentation.PresentationUser;
+
+public class SessionLayerTest {
+    private PresentationUser presentation = new PresentationMockObject();
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.SessionLayer(PresentationUser)'
+     */
+    @Test
+    public final void testSessionLayer() {
+        assertEquals(SessionLayer.ER_SPDU, 0);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.connectRequest(AccessPoint,
+     * AccessPoint, int, AccessPoint, AccessPoint, int, int, int, int, int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testConnectRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        session.connectRequest(OsiTests.calledNSAP, OsiTests.calledTSAP, 1,
+                null, null, 1, 1, 1, 1, 1, data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.connectResponse(int,
+     * AccessPoint, int, int, int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.connectResponse(1, null, 1, 1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.dataRequest(DataUnit)'
+     */
+    @Test
+    public final void testDataRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.dataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.expeditedDataRequest(DataUnit)'
+     */
+    @Test
+    public final void testExpeditedDataRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.expeditedDataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.typedDataRequest(DataUnit)'
+     */
+    @Test
+    public final void testTypedDataRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.typedDataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.capabilityDataRequest(DataUnit)'
+     */
+    @Test
+    public final void testCapabilityDataRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.capabilityDataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.capabilityDataResponse(DataUnit)'
+     */
+    @Test
+    public final void testCapabilityDataResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.capabilityDataResponse(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.tokenGiveRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testTokenGiveRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.tokenGiveRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.tokenPleaseRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testTokenPleaseRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.tokenPleaseRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.controlGiveRequest(DataUnit)'
+     */
+    @Test
+    public final void testControlGiveRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.controlGiveRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMinorRequest(int, int,
+     * int, DataUnit)'
+     */
+    @Test
+    public final void testSyncMinorRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMinorRequest(1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMinorResponse(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMinorResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMinorResponse(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMajorRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMajorRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMajorRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMajorResponse(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMajorResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMajorResponse(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.resynchronizeRequest(int,
+     * int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testResynchronizeRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.resynchronizeRequest(1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.resynchronizeResponse(int,
+     * int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testResynchronizeResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.resynchronizeResponse(1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.userExceptionReportRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testUserExceptionReportRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.userExceptionReportRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityStartRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityStartRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityStartRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityResumeRequest(int,
+     * int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testActivityResumeRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityResumeRequest(1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityInterruptRequest(DataUnit)'
+     */
+    @Test
+    public final void testActivityInterruptRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityInterruptRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityInterruptResponse(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityInterruptResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityInterruptResponse(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityDiscardRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityDiscardRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityDiscardRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityDiscardResponse(DataUnit)'
+     */
+    @Test
+    public final void testActivityDiscardResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityDiscardResponse(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityEndRequest(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityEndRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityEndRequest(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityEndResponse(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityEndResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityEndResponse(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.releaseRequest(DataUnit)'
+     */
+    @Test
+    public final void testReleaseRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        session.releaseRequest(data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.releaseResponse(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testReleaseResponse() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.releaseResponse(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.userAbortRequest(DataUnit)'
+     */
+    @Test
+    public final void testUserAbortRequest() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        session.userAbortRequest(data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.connectIndication(int,
+     * AccessPoint, AccessPoint, int, int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.connectIndication(1, null, null, 1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.connectConfirm(int,
+     * AccessPoint, int, int, int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.connectConfirm(1, null, 1, 1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.dataIndication(DataUnit)'
+     */
+    @Test
+    public final void testDataIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.dataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.expeditedDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testExpeditedDataIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.expeditedDataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.typedDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testTypedDataIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.typedDataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.capabilityDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testCapabilityDataIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.capabilityDataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.capabilityDataConfirm(DataUnit)'
+     */
+    @Test
+    public final void testCapabilityDataConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.capabilityDataConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.tokenGiveIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testTokenGiveIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.tokenGiveIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.tokenPleaseIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testTokenPleaseIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.tokenPleaseIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.controlGiveIndication(DataUnit)'
+     */
+    @Test
+    public final void testControlGiveIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.controlGiveIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMinorIndication(int, int,
+     * int, DataUnit)'
+     */
+    @Test
+    public final void testSyncMinorIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMinorIndication(1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMinorConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMinorConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMinorConfirm(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMajorIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMajorIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMajorIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.syncMajorConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testSyncMajorConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.syncMajorConfirm(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.resynchronizeIndication(int,
+     * int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testResynchronizeIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.resynchronizeIndication(1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.resynchronizeConfirm(int,
+     * int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testResynchronizeConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.resynchronizeConfirm(1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.providerExceptionReportIndication(int)'
+     */
+    @Test
+    public final void testProviderExceptionReportIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.providerExceptionReportIndication(1);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.userExceptionReportIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testUserExceptionReportIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.userExceptionReportIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityStartIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityStartIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityStartIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityResumeIndication(int,
+     * int, int, int, int, DataUnit)'
+     */
+    @Test
+    public final void testActivityResumeIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityResumeIndication(1, 1, 1, 1, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityInterruptIndication(DataUnit)'
+     */
+    @Test
+    public final void testActivityInterruptIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityInterruptIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityInterruptConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityInterruptConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityInterruptConfirm(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityDiscardIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityDiscardIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityDiscardIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityDiscardConfirm(DataUnit)'
+     */
+    @Test
+    public final void testActivityDiscardConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityDiscardConfirm(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityEndIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityEndIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityEndIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.activityEndConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testActivityEndConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.activityEndConfirm(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.releaseIndication(DataUnit)'
+     */
+    @Test
+    public final void testReleaseIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.releaseIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.releaseConfirm(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testReleaseConfirm() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.releaseConfirm(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.userAbortIndication(DataUnit)'
+     */
+    @Test
+    public final void testUserAbortIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.userAbortIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.session.SessionLayer.providerAbortIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testProviderAbortIndication() {
+        SessionLayer session = new SessionLayer(false, this.presentation,
+                OsiTests.callerSSAP, OsiTests.callerTSAP);
+        session.providerAbortIndication(1, null);
+    }
+}

src/test/java/de/thpeetz/network/osi/transport/SessionMockObject.java

@@ -0,0 +1,145 @@
+package de.thpeetz.network.osi.transport;
+
+import de.thpeetz.network.osi.AccessPoint;
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.session.SessionUser;
+
+public class SessionMockObject implements SessionUser
+{
+
+	public void connectIndication(int connectionIdentifier,
+			AccessPoint callingAddress, AccessPoint calledAddress,
+			int qualityOfService, int sessionRequirements,
+			int firstSPSerialNumber, int secondSPSerialNumber,
+			int assignmentOfTokens, DataUnit userdata)
+	{
+	}
+
+	public void connectConfirm(int connectionIdentifier,
+			AccessPoint respondingAddress, int result, int qualityOfService,
+			int sessionRequirements, int firstSPSerialNumber,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userData)
+	{
+	}
+
+	public void dataIndication(DataUnit userData)
+	{
+	}
+
+	public void expeditedDataIndication(DataUnit userData)
+	{
+	}
+
+	public void typedDataIndication(DataUnit userData)
+	{
+	}
+
+	public void capabilityDataIndication(DataUnit userData)
+	{
+	}
+
+	public void capabilityDataConfirm(DataUnit userData)
+	{
+	}
+
+	public void tokenGiveIndication(int tokens, DataUnit userData)
+	{
+	}
+
+	public void tokenPleaseIndication(int tokens, DataUnit userData)
+	{
+	}
+
+	public void controlGiveIndication(DataUnit userData)
+	{
+	}
+
+	public void syncMinorIndication(int type, int dataSeparation,
+			int firstSPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void syncMinorConfirm(int firstSPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void syncMajorIndication(int firstSPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void syncMajorConfirm(int secondSPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void resynchronizeIndication(int firstResynchronizeType,
+			int firstSPSerialNumber, int secondResynchronizeType,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userdata)
+	{
+	}
+
+	public void resynchronizeConfirm(int firstResynchronizeType,
+			int firstSPSerialNumber, int secondResynchronizeType,
+			int secondSPSerialNumber, int assignmentOfTokens, DataUnit userdata)
+	{
+	}
+
+	public void providerExceptionReportIndication(int reason)
+	{
+	}
+
+	public void userExceptionReportIndication(int reason, DataUnit userData)
+	{
+	}
+
+	public void activityStartIndication(int activityIdentifier,
+			DataUnit userData)
+	{
+	}
+
+	public void activityResumeIndication(int activityIdentifier,
+			int oldActivityIdentifier, int firstSPSerialNumber,
+			int secondSPSerialNumber, int oldSessionConnectionIdentifier,
+			DataUnit userData)
+	{
+	}
+
+	public void activityInterruptIndication(DataUnit userData)
+	{
+	}
+
+	public void activityInterruptConfirm(int reason, DataUnit userData)
+	{
+	}
+
+	public void activityDiscardIndication(int reason, DataUnit userData)
+	{
+	}
+
+	public void activityDiscardConfirm(DataUnit userData)
+	{
+	}
+
+	public void activityEndIndication(int firstSPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void activityEndConfirm(int secondSPSerialNumber, DataUnit userData)
+	{
+	}
+
+	public void releaseIndication(DataUnit userData)
+	{
+	}
+
+	public void releaseConfirm(int result, DataUnit userData)
+	{
+	}
+
+	public void userAbortIndication(DataUnit userData)
+	{
+	}
+
+	public void providerAbortIndication(int reason, DataUnit userData)
+	{
+	}
+}

src/test/java/de/thpeetz/network/osi/transport/TransportLayerTest.java

@@ -0,0 +1,142 @@
+package de.thpeetz.network.osi.transport;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+import de.thpeetz.network.osi.DataUnit;
+import de.thpeetz.network.osi.DataUnitManager;
+import de.thpeetz.network.osi.OsiTests;
+
+public class TransportLayerTest {
+    private SessionMockObject session = new SessionMockObject();
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.TransportLayer(SessionUser)'
+     */
+    @Test
+    public final void testTransportLayer() {
+        assertEquals(TransportLayer.ER_TPDU, 0x70);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.connectRequest(AccessPoint,
+     * AccessPoint, AccessPoint, boolean, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectRequest() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        transport.connectRequest(OsiTests.calledNSAP, OsiTests.calledTSAP,
+                OsiTests.callerTSAP, false, 0, data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.connectResponse(int,
+     * AccessPoint, boolean, DataUnit)'
+     */
+    @Test
+    public final void testConnectResponse() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.connectResponse(1, null, true, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.disconnectRequest(DataUnit)'
+     */
+    @Test
+    public final void testDisconnectRequest() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        DataUnit data = DataUnitManager.getInstance();
+        transport.disconnectRequest(data);
+        DataUnitManager.freeInstance(data);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.dataRequest(DataUnit)'
+     */
+    @Test
+    public final void testDataRequest() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.dataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.expeditedDataRequest(DataUnit)'
+     */
+    @Test
+    public final void testExpeditedDataRequest() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.expeditedDataRequest(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.connectConfirm(int,
+     * AccessPoint, boolean, DataUnit)'
+     */
+    @Test
+    public final void testConnectConfirm() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.connectConfirm(1, null, true, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.connectIndication(AccessPoint,
+     * AccessPoint, boolean, int, DataUnit)'
+     */
+    @Test
+    public final void testConnectIndication() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.connectIndication(null, null, true, 1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.disconnectIndication(int,
+     * DataUnit)'
+     */
+    @Test
+    public final void testDisconnectIndication() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.disconnectIndication(1, null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.dataIndication(DataUnit)'
+     */
+    @Test
+    public final void testDataIndication() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.dataIndication(null);
+    }
+
+    /*
+     * Test method for
+     * 'com.peetz.network.osi.transport.TransportLayer.expeditedDataIndication(DataUnit)'
+     */
+    @Test
+    public final void testExpeditedDataIndication() {
+        TransportLayer transport = new TransportLayer(false, this.session,
+                OsiTests.callerTSAP);
+        transport.expeditedDataIndication(null);
+    }
+}

src/test/java/de/thpeetz/tools/ObjectPoolTest.java

@@ -0,0 +1,45 @@
+package de.thpeetz.tools;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+import de.thpeetz.network.osi.DataUnit;
+
+public class ObjectPoolTest {
+
+	/*
+	 * Test method for 'com.peetz.tools.ObjectPool.ObjectPool(Class)'
+	 */
+	@Test
+	public final void testObjectPoolClass() {
+		ObjectPool<DataUnit> objectPool = new ObjectPool<DataUnit>(DataUnit.class);
+		assertNotNull(objectPool);
+	}
+
+	/*
+	 * Test method for 'com.peetz.tools.ObjectPool.ObjectPool(Class, int)'
+	 */
+	public final void testObjectPoolClassInt() {
+		ObjectPool<DataUnit> objectPool = new ObjectPool<DataUnit>(DataUnit.class, 5);
+		assertNotNull(objectPool);
+	}
+
+	/*
+	 * Test method for 'com.peetz.tools.ObjectPool.getInstance()'
+	 */
+	public final void testGetInstance() {
+		ObjectPool<DataUnit> objectPool = new ObjectPool<DataUnit>(DataUnit.class, 1);
+		DataUnit unit = objectPool.getInstance();
+		assertNotNull(unit);
+	}
+
+	/*
+	 * Test method for 'com.peetz.tools.ObjectPool.freeInstance(Object)'
+	 */
+	public final void testFreeInstance() {
+		ObjectPool<DataUnit> objectPool = new ObjectPool<DataUnit>(DataUnit.class);
+		DataUnit unit = objectPool.getInstance();
+		objectPool.freeInstance(unit);
+	}
+}