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    Cannot Connect to 5G network

    Qualcomm Flight RB5 5G Drone
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    • tomT
      tom admin
      last edited by

      @chris_macdonald One note, after running through rb5-modem-configure it'll setup a rb5-modem background service. I recommend disabling that service if you're experimenting with initializing a connection manually: systemctl stop rb5-modem && systemctl disable rb5-modem

      Otherwise you may have the same script running twice at the same time.

      What cellular provider are you attempting to use?

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        chris_macdonald @tom
        last edited by

        @tom Noted. Stopping and disabling the service before manually running the modem start script appears to have not changed the outcome. Letting the service start it by itself does not seem to work to establish a connection either.

        The carrier network we tried was Verizon. We have switched back to our private network.

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        • tomT
          tom admin
          last edited by

          @chris_macdonald Okay, Verizon is not supported by Quectel. They won't allow a Quectel modem to connect to their network.

          Internally we test with GoogleFi (uses TMobile)

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            chris_macdonald @tom
            last edited by

            @tom Gotcha. We had the same issue on our private network that does support Quectel.

            Eric KatzfeyE 1 Reply Last reply Reply Quote 0
            • tomT
              tom admin
              last edited by

              @chris_macdonald Okay another thought, we had another customer who needed to unlock their SIM using a PIN in order to enable it: https://forum.modalai.com/topic/783/sim-card-pin-issue-for-lte-v2-module?_=1647023788468

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                chris_macdonald @tom
                last edited by

                @tom Just checked it on a phone and SIM card doesn't seem to have a PIN

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                • Eric KatzfeyE
                  Eric Katzfey ModalAI Team @chris_macdonald
                  last edited by

                  @chris_macdonald What band is your private network using?

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                    chris_macdonald @Eric Katzfey
                    last edited by

                    @Eric-Katzfey N41 (2.5Ghz)

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                      chris_macdonald @chris_macdonald
                      last edited by

                      Are there any forcing options? Can we force the drone to be on 5G only?

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                      • tomT
                        tom admin
                        last edited by tom

                        There are, however most carriers require an initial connection to 4G and then a handoff to 5G, therefore the modem may not be able to make a connection when setting to 5G only.

                        By default it is set to both LTE and 5G and will always prefer 5G if it's available.

                        We set this setting in /usr/bin/set-mode-pref
                        which sends an AT command to the modem.

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                          chris_macdonald @tom
                          last edited by

                          @tom The link is coming back bad on my end. We will try a different carrier as well.

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                          • tomT
                            tom admin
                            last edited by

                            @chris_macdonald Oops, my bad. It is on board at /usr/bin/set-mode-pref

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