WP7702 fails to switch off radio

Legato Application Framework
1

We are seeing some rare issues when doing a test that continuously tries to connect in a test that powers the device for a while and then unpowers it for a while. We’ve added some code that uploads the logfile when it failed to connect on previous attemps and we’re seeing a strange thing where rarely the gateway fails to switch off the radio using le_mrc_SetRadioPower(LE_OFF);

This the excerpt from a correct device:

 myAt[1253]/at T=main | atCommands.c PrintLine() 340 | Unsollicited: 2023-09-19 05:57:38: Cannot Establish connection, switch radio off
 dcsDaemon[1162]/dcsCellular T=main | dcsCellular.c DcsCellularConnEventStateHandler() 254 | State of connection 1 transitioned from up to down
 dcsDaemon[1162]/dcsCellular T=main | dcsCellular.c le_dcsCellular_RetryConn() 1300 | Initiated retrying connection 1; retry attempt 1, backoff 1 secs
 dcsDaemon[1162]/dcsCellular T=main | dcsCellular.c DcsCellularConnEventStateHandler() 311 | Wait for the next retry before failing connection 1
 dcsDaemon[1162]/dcsDaemon T=main | dcsServer.c ChannelEventHandler() 780 | Received for channel reference 0x1a9 event Temporary Down

In the case where it fails we see the following:

myAt[1250]/at T=main | atCommands.c PrintLine() 340 | Unsollicited: 2023-09-20 08:18:35: Cannot Establish connection, switch radio off
swi-mdm9x28-wp user.warn kernel: [  208.409847] PSM: Modem oprt mode - 6

What does this error mean, and what can we do to clear it? As it looks like it is only cleared with a full power cycle and not with an AT!RESET or similar.

2

When you use “cm radio off”, it actually uses le_mrc_SetRadioPower(LE_OFF).
After that you can check at+cfun?, it will return “+CFUN: 0”.

have you tried using AT command instead?

3

Unfortunately this was only passive data collection, so I don’t have that date. I will see if I can get one on my desk with this issue.

4

I’ve still been unable to reproduce this issue, but it has only happened so far when the sim was suspended.

I will see if I can find time next week to see if I can replicate it.