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

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.

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

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README.md		README.md
main.c		main.c