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A7672s SIMCom Interfaced with ESP32

The given code covers all the basic needs to communicate with A7672s SIMCom Module with ESP32 to post data on MQTT

GPIO Functions:

I am using ESP32 Devkit V1

  • GPIO 2 : Builtin LED ( Devkit V1 )
  • GPIO 17 : UART TX
  • GPIO 16 : UART RX
  • GPIO 21 : ENABLE of A7672s

Understanding the Flow:

  • This code is developed for ESP32 on Embedded C Language using FreeRTOS.
  • Entire Communication is based on UART protocol between ESP and A7672s SIMCom.
  • The default baud of SIMCom is 115200 with 8 data bits, None parity and 1 stop bit.
  • There are several "AT" Commands over which SIMCom understands, performance and responses tasks.
  • The code initializes AT Commands, followed by getting the IP of simcard used.
  • Further, through SNTP we get the date-time for specified location.
  • Lastly, MQTT is started with specified broker and payload is posted on "4GBOARD_SIMCOMM".
  • We also subscribe to a topic "4GBOARD_SIMCOMM/cmd" to receive payload.
  • Note :
  • 1) Simcard used need to have whitelisting of SNTP or broker being used ( if simcard is not general one ).
  • 2) If SIMCom loses given MQTT Connection, then it would disconnect and stop MQTT by executing those AT Commands before restarting.

Conclusion:

  • There is nothing to conclude this time, it's super cool and works flawlessly.
  • I have used basic AT Commands to perform few task but there's a big list of things one can discover and do!
  • I hope you all like it :-D

Reference Material: