MarianoAfter comparing the SimCom radio manuals, the AT command sets are a bit different between the models. Some are the same, some replaced, others seem to have been merged and others deprecated all together. So the original firmware loaded on the arduino won't work any longer.
After doing some searches online, I found this very helpful post that compares the AT commands between the radios we're using.
https://iotespresso.com/sim800c-to-sim7600-network-related-at-command-changes/
This table comparing the commands is particularly helpful, as I don't have to jump around the manual to find all these commands.
If we manage to get a copy of the original code, we'll need rewrite quite a bit.
Armed with this information I should be able to test getting and sending information to a back end service from a serial terminal.
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The aim is to use the older working release of the Arduino code and modify it as little as possible. The first step is to update the few functions that send the AT commands over serial. I was told they weren't using any third party libraries other than those already built into the Arduino's base.
Are you sure? yes | no
Are you planning to use any new libraries or frameworks for the Arduino to accommodate the new AT commands, or will the rewritten firmware be built off the old version?
Are you sure? yes | no