Intermittent EMM_CAUSE_ESM_FAILURE on EG800Q-EU

IoT Modules LTE-A Module
1

Hi,

I am experiencing intermittent +CEREG=0,3 errors when trying to attach to the network. AT+CEER indicates +CEER: EMM_CAUSE_ESM_FAILURE

Why would this happen intermittently? Is there a way for me to debug this on a lower level?

Thanks!

15:04:46.234 > AT+CGDCONT?
15:04:46.234 > +CGDCONT: 1,"IP”,”private.myapn.co.za,”0.0.0.0”,0,0,0,0
15:04:46.239 >
15:04:46.239 > OK
15:04:46.239 >
15:04:46.239 > AT+CGACT?
15:04:46.935 > +CGACT: 1,0
15:04:46.935 >
15:04:46.935 > OK
15:04:46.935 >
15:04:47.636 > AT+CEREG=2
15:04:47.636 > OK
15:04:47.636 >
15:04:48.036 > AT+CEREG?
15:04:48.037 > +CEREG: 2,2
15:04:48.037 >
15:04:48.037 > OK
15:04:48.037 >
15:04:50.141 > DBG> AT+CEREG?
15:04:50.141 > +CEREG: 2,3,“659E”,“573DD14”,7
15:04:50.141 >
15:04:50.141 > OK
15:04:50.141 >
15:04:50.843 > AT+CEER
15:04:50.844 > +CEER: EMM_CAUSE_ESM_FAILURE
15:04:50.849 >
15:04:50.849 > OK

2

This event is usually related to the SIM card and APN, you need to check whether the APN is correct or matches the SIM card correctly; You can also use other SIM cards for cross-verification