ST87M01 does not generate +CEREG 5 URC when it registers to the network

[Thierry Didi]

Dear ST team,

I have configured the ST87M01 for sending +CEREG URCs when registration state changes with AT+CEREG=5.

But the modem attaches, but does not sent +CEREG notification (see traces below): Is this a nominal behavior ?

AT+CEREG=5
OK
AT+CEREG=?
+CEREG: (0,1,2,3,4,5)

OK
AT+CEREG?
+CEREG: 5,2,"","",,,,"",""

OK

+CEREG: 0,"","",,,,"",""

+CEREG: 2,"","",,,,"",""

+CSCON: 1

+CEREG: 0,"","",,,,"",""

+CSCON: 0

+CEREG: 2,"","",,,,"",""

+CSCON: 1

+CEREG: 0,"","",,,,"",""

+CSCON: 0

+CEREG: 2,"","",,,,"",""

+CSCON: 1

+CEREG: 0,"","",,,,"",""

+CSCON: 0

+CEREG: 2,"","",,,,"",""

+CSCON: 1

+CEREG: 0,"","",,,,"",""

+CSCON: 0

+CEREG: 2,"","",,,,"",""

+CSCON: 1

+CSCON: 0

+CEREG: 0,"","",,,,"",""

#STENG: ECID=08507721,SRV1=FFB11868,PLMN=0002F802,EDRX=00000001,PSM=00000000,ENRG=000045D7

#SLEEP DRX 2.4s

#WAKEUP DRX

#STENG: ECID=08507721,SRV1=FFB21868,PLMN=0002F802,EDRX=00000001,PSM=00000000,ENRG=00000016

#SLEEP DRX 1.7s

#WAKEUP DRX

 

Best regards,

Thierry

[Thierry Didi]

Hello,

It looks like the problem comes from the Wireless Logic SIM card which is shiped into the EVKITST87M01-2 dev kit box. This SIM card does not support (as of today) NBIOT in France. This  was confirmed by Wireless Logic support.

I have tested with another SIM card and the +CEREG 5 is generated as expected,

Best Regards

Thierry