NB-IoT at+cgatt always returns 0

NB-IoT
1

Hi All,

I finally had some time to set up my NB-IoT shield. I have an N200 attached to a Pi Zero and use minicom for serial communication. Unfortunately, I am not able to get a connection, I keep receiving AT+CGATT=0 for at least 30 minutes, despite repeated attempts. I have the latest firmware, version 6.57. The signal level seems good. For the log, see below. Any pointer would be appreciated. Thanks!

AT+NRB
REBOOTING
REBOOT_CAUSE_APPLICATION_AT
u-blox
OK
AT+NCONFIG?
+NCONFIG: “AUTOCONNECT”,“FALSE”
+NCONFIG: “CR_0354_0338_SCRAMBLING”,“FALSE”
+NCONFIG: “CR_0859_SI_AVOID”,“FALSE”
+NCONFIG: “COMBINE_ATTACH”,“FALSE”
+NCONFIG: “CELL_RESELECTION”,“FALSE”
+NCONFIG: “ENABLE_BIP”,“FALSE”
OK
AT+CFUN?
+CFUN: 0
OK
AT+NCDP?
+NCDP: “172.16.14.22”,5683
OK
AT+CGDCONT?
+CGDCONT: 0,“IP”,0,0,1
OK
AT+CGDCONT=1,“IP”,“oceanconnect.t-mobile.nl”
OK
AT+CGDCONT?
+CGDCONT: 1,“IP”,“oceanconnect.t-mobile.nl”,0,0,1
OK
AT+NBAND?
+NBAND: 8
OK
AT+CFUN=1
OK
AT+COPS=1,2,“20416”
OK
AT+CSQ
+CSQ: 25,99
OK
AT+CGMM
SARA-N200
OK
AT+CGMR
06.57
OK
AT+NUESTATS
“Signal power”,-805
“Total power”,-662
“TX power”,0
“TX time”,7161
“RX time”,29824
“Cell ID”,17162343
“ECL”,1
“SNR”,1
“EARFCN”,3747
“PCI”,34
“RSRQ”,-140
OK
AT+CGATT?
+CGATT: 0
OK

2

What I forgot to add is that this board is from the Kickstarter campaign and I use it in the Netherlands with the T-Mobile SIM card provided. Is there a way to check if the card is registered with T-Mobile?

3

Hey @attila,

Most of the time, it takes a while to make the first connection. I would try a few times again.
If this is not working, please send an email to info@sodaq.com describing the problem and a picture of the NB module (clear enough that we could read the IMEI, the number on the sticker) and we will check it.

4

Hi @ItayDagan,
Thanks for your kind reply. This seems to be a persistent problem to me, so I will send an email with further details.