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+---
+Author: Máté Kovács
+Version: 1551-CNL 113 831, Rev. A
+Date: 2016-03-18
+
+---
+= MQTT v3.1.1 Protocol Module for TTCN-3 Toolset with TITAN, Function Description
+:author: Máté Kovács
+:revnumber: 1551-CNL 113 831, Rev. A
+:revdate: 2016-03-18
+:toc:
+
+= Functionality
+
+The MQTT v3.1.1 protocol module implements the message structures of the related protocol in a formalized way, using the standard specification language TTCN-3. This allows defining of test data (templates) in the TTCN-3 language and correctly encoding/decoding messages when executing test suites using the Titan TTCN-3 test environment.
+
+== Implemented Protocols
+
+This protocol module implements the protocol messages and constants of the MQTT v3.1.1 protocol <<_4, [4]>>.
+
+[[modifications-deviations-related-to-the-protocol-specification]]
+== Modifications/Deviations Related to the Protocol Specification
+
+=== Unimplemented Messages, Information Elements and Constants
+
+None.
+
+=== Ericsson-Specific Changes
+
+None.
+
+== Backward Incompatibilities
+
+None.
+
+== System Requirements
+
+Protocol modules are a set of TTCN-3 source code files that can be used as part of TTCN-3 test suites only. Hence, protocol modules alone do not put specific requirements on the system used. However, in order to compile and execute a TTCN-3 test suite using the set of protocol modules the following system requirements must be satisfied:
+
+* Titan TTCN-3 Test Executor version CRL 113 200/5 R4A (5.4.pl0) or higher installed. For Installation Guide see <<_2, [2]>>.
+
+NOTE: This version of the test port is not compatible with Titan releases earlier than CRL 113 200/5 R4A.
+
+= Usage
+
+== Installation
+
+The set of protocol modules can be used in developing TTCN-3 test suites using any text editor; however, to make the work more efficient a TTCN3enabled text editor is recommended (for example `nedit`, `xemacs`). Since the MQTT v3.1.1 protocol is used as a part of a TTCN-3 test suite, this requires TTCN-3 Test Executor be installed before the module can be compiled and executed together with other parts of the test suite. For more details on the installation of TTCN-3 Test Executor see the relevant section of <<_3, [3]>>.
+
+== Configuration
+
+None.
+
+== Examples
+
+None.
+
+= Interface Description
+
+== Top Level PDU
+
+The top level PDU is the TTCN-3 union MQTT_v3_1_1_Message.
+
+[[encoding-decoding-and-other-related-functions]]
+== Encoding/Decoding and Other Related Functions
+
+This product also contains encoding/decoding functions, which assure correct encoding of messages when sent from TITAN and correct decoding of messages when received by TITAN.
+
+=== Implemented Encoding and Decoding Functions
+
+[cols=3*,options=header]
+|===
+
+|Name |Type of formal parameters |Type of return value
+
+|`f_MQTT_v3_1_1_enc` |in MQTT_v3_1_1_Message +
+out octetstring |integer
+|`f_MQTT_v3_1_1_dec` |in octetstring +
+out MQTT_v3_1_1_Message |integer
+|===
+
+= Terminology
+
+*TITAN:* +
+TTCN-3 Test Executor (see <<_2, [2]>>).
+
+= Abbreviations
+
+PDU:: Protocol Data Unit
+
+TTCN-3:: Testing and Test Control Notation version 3
+
+MQTT:: v3.1.1 MQTT Version 3.1.1 Protocol
+
+= References
+
+[[_1]]
+[1] ETSI ES 201 873-1 v4.5.1 (2013-04) +
+The Testing and Test Control Notation version 3. Part 1: Core Language
+
+[[_2]]
+[2] User Guide for TITAN TTCN-3 Test Executor
+
+[[_3]]
+[3] Programmer’s Technical Reference for Titan TTCN–3 Test Executor
+
+[[_4]]
+[4] MQTT Version 3.1.1
+http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html
+
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