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Hello i have created this repository to work upon stm32f4 and enable it with MQTT protocol using GSM module. I will be adding the code soon. 
Feel free to contribute.
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PROJECT STATUS:

17-08-17: Repository created and KEIL files added
13-10-17: Basic MQTT implemented using stm32f4+MC60(gsm module)+pahomqtt library
6-02-18: Inplemented MQTT with UART communication in Interrupt mode. Also now it reads a file from SD card and publishes it to a topic.