I did read this thread about almost a year ago. In Vietnam, we did try to archive the same target, but on a Maestro hardware (OpenAT OS). At first, lib mosquitto seem quite difficult for building with OpenAT OS tool chain. After turning around so many great MQTT library (eclipse M&M taho, some MQTT library for arduino) out there (at 2013,2014 time). IMHO, lib-mosquitto is the most compatible MQTT library for porting to OpenAT OS environment. Mainly because of its clear coding style and It was written to support multiple platform (POSIX, Win32). Thanks to lib mosquitto author.