Having a bit of the same problem. When the signal is bad, the chip brownouts a lot. Did you solve the problem?

What debug log levels are necessary to verify if it does a full or partial calibration?

Is there any chance the AT library will end up open to the public? Sorry that AT lib is not open source, and maybe it will not change to open source in the future. Sorry for the inconvenience. That's all right with me if we could get it working without errors in the uart communication. I'm in the p...

Glad you solved the framing issue. What was the root cause? We run an automated test on our AT command firmware (which uses the UART driver) to ensure no loss of data at 2Mbps. So in theory the UART driver can keep up. Is it possible there's another task or a lot of interrupt activity on the same C...