MQTT-Client for Delphi based on the work of Jamie Ingilby and Daniele Teti

Based roughly on MQTT Spec v3.0 and most important part of 3.1 - full UTF-8 support.

• Currently no support for login via user/password to broker.
• QoS 0 only
• See "Limitations" below

Works well in Delphi Berlin

Latest Fixes:

• Changes to correct UTF8 encoding in TBytes - using IndyTextEncoding_UTF8.GetString() instead of TEncoding.ANSI.GetString();
• Memory leak in HandleData() fixed through not raised exeption
• ThreadHandling optimized.
• Added Timer for KeepAlive-Ping to Client. Default 60 sec. Changing vtimeout via consructor possible.

LIMITATIONS:

This is not a reference implementation of the MQTT Protocol but does support both Publishing Messages and Subscribing to Topics with the following limitations: - It only allows and supports QoS 0 Messages. I haven’t built QoS levels 1 or 2 in yet as I personally have no need for them but this is planned for future versions. - You are required to schedule pinging the server yourself (using a TTimer for examples). The client library implements a ping command but doesn’t automatically ping the server itself at regular intervals.

USAGE:

There is a sample project included in the download but usage is relatively simple.