Janz Tec MQTT library for CODESYS SL

MQTT is a Client Server publish/subscribe messaging transport protocol. It is light weight, open, simple, and designed so as to be easy to implement. These characteristics make it ideal for use in many situations, including constrained environments such as communication in Machine to Machine (M2M) and Internet of Things (IoT) contexts where a small code footprint is required and / or network bandwidth is limited.

Janz Tec developed a CODESYS library which implements the MQTT protocol. This way users can add the MQTT protocol easily to their own IEC 61131 applications. The Janz Tec MQTT library for CODESYS implements client functionality. It is completely written in IEC code which guarantees the library can be used on any type of target system.

Current Version : 2.0.0.8
Article no : 2312000002
Category:

Description

Features:

  • CODESYS client library implementing MQTT protocol (version 3.1.1)
  • MQTT client functionality
  • Library completely written in IEC code, therefore independent from target system
  • Publish: Payload of any type can be transmitted to a broker*
  • Subscribe: Messages of any type from MQTT brokers can be received*
  • Message classification via MQTT topics
  • MQTT-QoS-Levels: * QoS0 (At-most-once) * QoS1 (At-least-once)
  • Authentication with user name / password
  • Auto-Reconnect is available if connection has been aborted
  • Channel encryption via SSL (TLS v1.1 Client)
  • Last will functionality
  • Topic wildcards (+/#)
  • For maximum supported message payload size, see global variable MQTT_GVL.MAX_PAYLOAD_SIZE

Currently not supported: * QoS2 (Exactly once)

Requirements

Programming system

CODESYS Development System V3.5.8.10

Target System

CODESYS Control V3.5.8.10

Supported platforms/devices

Notice: Use the sample project ‘mqtt_example.project’ to find out the supported features

Additional requirements

Standard CODESYS libraries „TCP, SysSocket, CmpErrors“ must be supported on the target

Licensing

License activation optional on CODESYS Runtime Key or CODESYS Soft Key. License per runtime device necessary.

Restrictions

  • Broker must support MQTT protocol version 3.1.1

  • WAGO e!Cockpit and PFC100 is not supported

  • MQTT QoS level QoS2 is not supported

  • Topic names must be less than 120 characters

  • Encryption (SSL/TLS): 

Client authentication with certificate not supported! Wait for

http://jira.codesys.com/browse/CDS-57009 see chapter SSL/TLS certificates

Encryption is not supported on 64bit systems

Required Accessory

CODESYS Key

Additional information

Article no :

2312000002

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