SIMCOM 800C Embedded AT custom firmware

i want to program SIM800c to public adc data over Mqtt . i want to achieve this without any additional MCU. Basically i want to use SIM800c 38 pin i…e, ADC data to publish to my mqtt client without any MCU. SO i need help in programming c code to SIM800c.

I didn’t find any examples over the internet.
I have got SDK for Embedded AT in simcom website. But much details are not clear.

Request to show me example to write custom firmware to SIMcom800c . Even helloworld program will also do good. thanks in advance