The reason I am looking at the AT commands is because ECM mode seems to shut down after some time, even if I am sending packets every 3 minutes… That lead me to look at what davidbonn published here: Another ECM Mode question
One problem compounded by another - Help?!
P.S. AT commands work fine, for a while, after a reboot of the entire system.
At the beginning I installed sixfab CORE using the install script on the Bullseye OS. Since the connection kept dropping, I started looking at the AT commands.
After I wrote the initial post above, I fell back to the Buster OS and followed the sixfab CORE install script again. Now the connection seems to be stable - It has been running overnight and is still running.
To make sure I understand, are you saying that using the sixfab CORE means that I should not be using any AT commands to “look” at the system? Or, in other words; use the sixfab CORE which sets up the wwan0 connection and “don’t worry” about it?
You can use AT commands through /dev/ttyUSB3 for your operation with the module, as Sixfab CORE uses /dev/ttyUSB2.
Both ECM and Sixfab CORE establish an internet connection, so you should use either.