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    LilyGo T-Call SIM800L board location issues

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    • K
      kakka0903 last edited by

      Hello Everyone,

      I really need some help troubleshooting location issues for the SIM800L. I am using the LiliyGO T-Call Sim800L and the R14.18 firmware. This is the response from the ATI command: SIM800 R14.18. My sim provider is Lebara (Netherlands) multimedia.lebara.nl is 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:

      AT+SAPBR=3,1,"Contype","GPRS"

      This gives me an ERROR response 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.

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      • S
        Sukaibin last edited by

        reference

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