AT commands for BG95-M3 low power mode that can receive SMS?

IoT Modules LPWA Module
1

I’m finding PSM, DRX, etc. confusing. I’d like to get my BG95-M3 online (CATM1) which I can do OK and get my ESP32 into PPP mode, and do data etc.

What I’d then like to do is drop out of online mode and leave the BG95 on the CATM1 network, using minimum power, but can be sent SMS and have the BG95 wake the ESP32 and go back into online data mode.

Can somebody help with the AT commands that can achieve this? My preference would be no UART activity till the SMS arrives, and the BG95 alerts the DTE using unsolicited text on the UART port. (I don’t have RI pin or other signals hooked up to wake the host)

Thanks in advance.

2

Hi @tpbedford

For PSM mode, module can not receive any data from network or remote server(including SMS).
But in DRX or eDRX or sleep mode, it can be receive SMS or DL data from network or remote server.

3

Thank you - I can see DRX is a good setting for our scenario

I have tried it with interval set to 20.48s, but still receive SMS after around 4s - so I do not think the setting is active. How can I check if the unit is currently using DRX mode? When setting CEDRXS does the setting take effect immediately?