I am observing interesting behaviour. FXT009, running 7.45
- Connect GPRS
- Run AT+CGATT=2 (kills both GSM and GPRS)
- Run AT+CGATT=1
LED starts flashing normally, GPRS can be brought up and is operational, but AT+CREG? returns 2,2 (searching)
It appears that modems in the field get into situation where GPRS is up, but modem reports loss of GSM registration. Use of AT+CGATT command is just one way I managed to reproduce it. We do not do that in the field.
Did anyone see situation where GSM registration appears lost, but GPRS operates?
This creates a particular problem for us, as we monitor modem status and attempt to recover (reset) if registration is lost for a while. We get quite a few of “false positive” resets where GPRS traffic is active and modem resets due to loss of registration. (Do not ask why we do not check for gprs traffic in decision making – it is a long story with lots of legacy code)