@Lilygo Hey could you please respond to my problem in the
technical discussion page about location problems on the LilyGo T-Call SIM800?
Latest posts made by kakka0903
LilyGo T-Call SIM800L board location issues
I really need some help troubleshooting location issues for the SIM800L. I am using the LiliyGO T-Call Sim800L and the
R14.18firmware. This is the response from the
SIM800 R14.18. My sim provider is Lebara (Netherlands)
multimedia.lebara.nlis their APN.
It seems most other functions than location are working fine. I can communicate with the modem by sending AT commands. I connect to the GPRS network and can send HTTP requests and SMS messages.
At first i tried using the GSM location feature trough the Arduino TinyGSM library. That never worked, so i tried doing it myself with AT commands. The following code blocks shows my steps.
/* make bearer profile correct, activate it */ // make sure bearer profile one is correct AT+SAPBR=3,1,Contype,GPRS OK // specify APN name AT+SAPBR=3,1,APN,multimedia.lebara.nl OK // activate bearer profile AT+SAPBR=1,1 OK
In many examples on the internet and in the datasheets from simcom's webpage they use double quotes for the string parameters like this:
This gives me an
ERRORresponse instead of
OK. So as you saw i do them without the double quotes which evidently seems to work fine.
After completing these commands, the indicator light on the LilyGO
board starts blinking faster (~3 per sec) indicating a gprs connection. After that i try getting the location.
/* Now for fetching the actual location */ // set lbs server AT+CLBSCFG=1,3,lbs-simcom.com:3002 OK // try getting location + time AT+CLBS=4,1 +CLBS: 1 OK // try getting only location AT+CLBS=1,1 +CLBS: 1 OK
Both these commands gives me a locationcode 1 error, which indicates no location. Specified in the GSM location datasheet. Earlier i would commonly get locationcode 3 which would indicate NET error, but i think that maybe was due to incorrect bearer profile settings.
One problem might be that the LBS server from simcom is not working correctly, so i also tried another server address
www.c4a.com.cn:3002. This one is from china.
/*Trying chinese LBS server */ // change lbs server setting AT+CLBSCFG=1,3,www.c4a.com.cn:3002 OK // trying to get location again AT+CLBS=1,1 +CLBS: 1 OK // and the other one AT+CLBS=4,1 +CLBS: 1 OK
There is also this redundant location command, using
AT+CIPGSMLOC, which does not work anymore. As expected not for me either.
/* trying redundant command */ AT+CIPGSMLOC=1,1 +CIPGSMLOC: 0,0.000000,0.000000,2021/10/23,16:38:47 OK
One last thing is that it might take some time for the network to calibrate before being able get location properly. I have tried this many times. Letting it sit connected for up to 2 hours, and trying every five minutes.
Some people have problems with power delivery to the board, but i do not think this is the case for me since i never have expected dropouts or restarts when using the board. My signal quality is also very good.
/* testing signal quality */ AT+CSQ +CSQ: 31,0 OK
I have already reached out multiple places for help this github issue seems really similar to mine, but he is actually able to get a location. I left a comment at the bottom. I also posted in TinyGSM's gitter chat, and in the Arduino stack exchange
So yeah that is my problem. I feel like i have exhausted every option, I even tried a sim from another country. If anyone are able to help, that would be greatly appreciated.