From time to time command COPS=…,13 hangs without response (no OK, ERROR, anything)
I discovered relation that once last notification from modem of +QUSIM is 0. For example:
+QINISTAT: last noti is +QINISTAT: 1
+QSIMSTAT: last noti is +QSIMSTAT: 1,1
+QUSIM: last noti is +QUSIM: 0 <—
+CFUN: last noti is +CFUN: 1
+CPIN: last noti is +CPIN: READY
then: AT+COPS=1,2,“26001”,13 always hangs during execution
but in different runtime once +QUSIM is 1 then COPS would be always executed normally without any disturbances.
I did lots of tries and it looks like constant pattern of behavior.
I get to assumption once:
+QSIMSTAT: 1,1 - inserted
+QINISTAT: 1 - initialized
+QUSIM: 0 - usim not initialized
then its considered as SIM and is allowed to attach only GSM - That’s why COPS hangs once its trying to attach to 5G.
Once:
+QSIMSTAT: 1,1 - inserted
+QINISTAT: 1 - initialized
+QUSIM: 1 - usim initialized
then in situation its detected as USIM - That’s why its allowed to attach to 4G, 5G and in consequence COPS successfully executes?
