Dear friend
I have experience with SIMCOM (800, 900, 7600, 5320) series can communicate with ESP32, through AT Commands .
Can change to ADC 100 sample per second.
Save log to EEPROM, upload data with JSON string through HTTP POST protocal, includes RTC value
In server side, will use NodeJS, language of API is PHP
I can done all within one day
I'm new in freelancer.com site, so i need some initial project to can start, but don't worry about my skills and my experience, i have 12 experience in IoT, Robotic, Mechatronic, Smart Device, Electronic.
I also can build PCB and ship to you.
Best regards