A small incomplete undocumented and poorly tested MQTT 3.1.1 client library written in <500 lines of C99. The library uses no dynamic allocation and compiles down to ~1K on ARM thumb.
NOTE: This is very much a work in progress still. It should be fairly easy to hack on though.
See mqtt.h and mqtt.c for the implementation of the MQTT protocol.
client.c, client.h and client_test.c.c are just TCP drivers to test the MQTT library. The test is performed by connecting to a public MQTT broker and publishing some gibberish.
Compile and try by running
gcc client.c mqtt.c client_test.c -Wall -Wextra
./a.out &
./a.out pub
.... and sit back and watch the horrors unfold
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