Hi!
I recently received my order of 8 Sara SFF R410M boards. However, 5 out of 8 of them are unable to make a connection to the NB-IoT network. I have tried to change antennas with the ones working but there is no difference. I have also switched sim-cards between working boards and those not being able to connect and there is still no difference. All antennas and all sim-cards work on the 3 “good” boards and none work with the “bad” boards. All boards were ordered and delivered at the same time an all have, according to your support page, the latest firmware (L0.0.00.00.05.08,A.02.04). The AT command exchange of the good boards are as follows:
>> AT
<< timed out
>> AT
<< timed out
>> AT
<< timed out
>> AT
<< timed out
>> AT
<< AT
<< OK
<< timed out
<< timed out
>> AT+CMEE=2
<< AT+CMEE=2
<< OK
>> AT+UGPIOC=16,255
<< AT+UGPIOC=16,255
<< OK
>> ATE0
<< ATE0
<< OK
>> AT+CFUN?
<< +CFUN: 1
<< OK
>> AT+UMNOPROF?
<< +UMNOPROF: 100
<< OK
>> AT+URAT?
<< +URAT: 8
<< OK
>> AT+COPS=3,2
<< OK
>> AT+COPS?
<< +COPS: 1
<< OK
>> AT+COPS=1,2,"24001"
<< OK
>> AT+CGDCONT?
<< +CGDCONT: 1,"IP","lpwa.telia.iot","xx.xx.xx.xxx",0,0,0,0 //ip is obtained, but masked
<< OK
>> AT+CSQ
<< +CSQ: 22,99
<< OK
>> AT+CPIN?
<< +CPIN: READY
<< OK
-> Connected successfully!
>> AT+CPSMS=0
<< OK
>> AT+CEDRXS=0
<< OK
>> AT+UPSV=0
<< OK
And with the bad ones:
>> AT
<< timed out
>> AT
<< timed out
>> AT
<< timed out
>> AT
<< timed out
>> AT
<< AT
<< OK
<< timed out
<< timed out
>> AT+CMEE=2
<< AT+CMEE=2
<< OK
>> AT+UGPIOC=16,255
<< AT+UGPIOC=16,255
<< OK
>> ATE0
<< ATE0
<< OK
>> AT+CFUN?
<< +CFUN: 1
<< OK
>> AT+UMNOPROF?
<< +UMNOPROF: 100
<< OK
>> AT+URAT?
<< +URAT: 8
<< OK
>> AT+COPS=3,2
<< OK
>> AT+COPS?
<< +COPS: 1
<< OK
>> AT+COPS=1,2,"24001"
<< +CME ERROR: no network service
-> Network connection failed
