QUECTEL BC95-B8 not connecting to Network
jonasled last edited by Aleksandra Klinkner
Hi, I’ve bought a dev kit with the QUECTEL BC95-B8 and trying to connect it to the network in Germany. I first tried the Tutorial for the SARA N211, which was recommendet here, but a lot of the commands are not available (always getting ERROR as response). After some more googling I’ve found this PDF file which describes the connecting with the exact same firmware as my device has, but I stuck at the point where I have to wait for the attachment.
Output of at+nuestats:
Signal power:0 Total power:-32767 TX power:0 TX time:0 RX time:1226182 Cell ID:0 DL MCS:0 UL MCS:0 DCI MCS:0 ECL:0 SNR:0 EARFCN:0 PCI:0
This is the Dev Board: https://www.quectel.com/product/gsmevb.htm
I tried also getting data from the Debug Serial, but the bitrate from the manual doesn’t work
OK, I’ve got the log viewer and the network working (I get a signal), but my device gets rejetet. The rejection status in UE Log Viewer is EMM_CAUSE_UNKNOWN
@jonasled Can you check if you have a working SIM card? Try AT+CPIN?
It should return OK
AT+CPIN? returns error, but this can also be caused by the module, because there are a lot of commands producing errors.
But the card gets detectetd, becauser AT+CIMI returns the number
@jonasled You can enable more verbose error reporting with AT+CMEE=2. That will tell you what kind of error you have.
Quectel usually has their own version for every command so SARA N211 commands will not work.
What I can think of:
- Make sure you have the latest firmware
- Make sure the SIM works (try with a different module?)
- Make sure the antenna is properly connected
- Make sure you are in range of a network (scan with AT+COPS=?)
- Make sure you have a proper powersupply/cable (especially some USB supplies can be bad)
- Make sure you have the correct LTE bands enabled
- It should autoconnect to an available network but if it doesn’t you can force it with AT+COPS
Thank you for the quick answer, AT+CMEE=2 is not working, I can only select between 0 and 1, firmware updating is also not possible, because I can’t find any firmware online (I’ve already contacted Quectel, but no answer at the moment). I also don’t have another device to test the card. But it looks like that I have a signal:
AT+NUESTATS Signal power:-1004 Total power:-873 TX power:23 TX time:27010 RX time:358251 Cell ID:31251973 DL MCS:0 UL MCS:0 DCI MCS:0 ECL:2 SNR:-20 EARFCN:3740 PCI:58 OK AT+COPS? +COPS:0,2,"" OK AT+COPS=? +COPS:(2,,,"26201"),,(0-2),(2) OK AT+NCONFIG? +NCONFIG:AUTOCONNECT,TRUE +NCONFIG:CR_0354_0338_SCRAMBLING,TRUE +NCONFIG:CR_0859_SI_AVOID,TRUE OK AT+CSQ +CSQ:13,99 OK AT+NBAND? +NBAND:8 OK AT+CEREG? +CEREG:0,2 OK AT+CGATT? +CGATT:0 OK
@jonasled “EMM_CAUSE_UNKNOWN” is hard to diagnose. Any time I have seen this error it could either be some operator issue, a SIM issue or a modem FW related issue. So I would suggest to update the FW first and then try again
Do you know where to get the firmware update. I’ve seen here a link to a nextcloud from telekom, but it doesn’t exist anymore.
@jonasled I got mine through a supplier. So try asking the company you bought the devkit from. I do not like how quectel handles this, it is very inconvenient and old fashioned…
The problem is, I bought this from a private person used on ebay. I hope they answer next week on my mail.