Bad batch of boards? Fails to connect

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

Hi @mmolder,

Can you send an email to shop@sodaq.com to get the “bad” boards replaced?

Can you check on top of the module the production date of the module?
Is this the same for the “good” and the “bad”?
image

Best regards,
Jan

Hi!

Yes, the number on the Ublox module is the same for all (19/27). The number before, 03 in your picture, differs between them, but I assume this is the production number in that batch? I will get in contact with the shop to have them replaced. There will be marks after soldering to the GPIO pins on all boards, hopefully this is fine.