This the MQTT client code for Delphi by Jamie Ingilby with changes to make it useable in Free Pascal.
http://jamiei.com/blog/code/mqtt-client-library-for-delphi/
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Rewrote the reader thread loop so as to make it simpler and faster also fixes a bug whereby the client would segfault if the server went down and a major bug where timeouts on rx would cause data corruption.
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Replaced the original client demo code with a simpler demo that does not use forms. I am using this in an embedded system with no display.
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Changed all strings to ansi strings so that it can have topics and payloads longer than 255 bytes.
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Also includes the parts of Ararat Synapse required to build.
$ cd examples/embeddedApp
$ ./build
Running embeddedApp out of the box reqires you have access to test.mosquitto.org.