Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
Collapse
Brand Logo

ModalAI Forum

  1. ModalAI Support Forum
  2. General Questions
  3. LTE strength

LTE strength

Scheduled Pinned Locked Moved Unsolved General Questions
11 Posts 2 Posters 1.6k Views 2 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • tomT Offline
    tomT Offline
    tom
    admin
    wrote on last edited by
    #2

    You can use a variety of AT commands in order to read / write to the modem. One command that we often use to query signal strength is AT+QENG="servingcell". You can send this command and read the output to the terminal all in a single command using echo -ne "AT+QENG=\"servingcell\"\r" | busybox microcom -t 1000 /dev/ttyUSB2.

    1 Reply Last reply
    0
    • Aldo Castro FreireA Offline
      Aldo Castro FreireA Offline
      Aldo Castro Freire
      Regular
      wrote on last edited by
      #3

      thank you I will try that

      1 Reply Last reply
      0
      • Aldo Castro FreireA Offline
        Aldo Castro FreireA Offline
        Aldo Castro Freire
        Regular
        wrote on last edited by
        #4

        @tom said in LTE strength:

        busybox microcom -t 1000 /dev/ttyUSB2.

        Hi just one question what does this mean ? : busybox microcom -t 1000 /dev/ttyUSB2

        1 Reply Last reply
        0
        • tomT Offline
          tomT Offline
          tom
          admin
          wrote on last edited by
          #5

          @Aldo-Castro-Freire microcom is a program that can be used to talk to devices over a serial port (/dev/ttyUSB2). It handles sending AT commands to the modem cleanly.

          1 Reply Last reply
          0
          • Aldo Castro FreireA Offline
            Aldo Castro FreireA Offline
            Aldo Castro Freire
            Regular
            wrote on last edited by
            #6

            I also have another modem that is 5g that I would like to connect to the microusb? what device would that be ? it would be ttyUSB1 ?

            1 Reply Last reply
            0
            • tomT Offline
              tomT Offline
              tom
              admin
              wrote on last edited by
              #7

              What 5g modem are you attempting to use? The drivers would need to be integrated into the kernel in order for it to be recognized.

              1 Reply Last reply
              0
              • Aldo Castro FreireA Offline
                Aldo Castro FreireA Offline
                Aldo Castro Freire
                Regular
                wrote on last edited by
                #8

                I am getting "ERROR" when running this command

                1 Reply Last reply
                0
                • tomT Offline
                  tomT Offline
                  tom
                  admin
                  wrote on last edited by
                  #9

                  Check here for Sierra's AT command documentation: https://source.sierrawireless.com/resources/airprime/software/airprime_wpx5xx_wp76xx_wp77xx_at_command_reference/

                  1 Reply Last reply
                  0
                  • Aldo Castro FreireA Offline
                    Aldo Castro FreireA Offline
                    Aldo Castro Freire
                    Regular
                    wrote on last edited by
                    #10

                    I am not sure but none of the commands are running.
                    Also, it does not have the command AT+QENG for me to check out

                    1 Reply Last reply
                    0
                    • tomT Offline
                      tomT Offline
                      tom
                      admin
                      wrote on last edited by
                      #11

                      Can you show an example output of what you are seeing? Also, which modem are you using?

                      1 Reply Last reply
                      0

                      Reading along? Create a free ModalAI Forum account to join in.

                      With an account you can reply, ask your own question, get an email when a ModalAI engineer answers, and mark the reply that solved it. Your place in each thread is saved between visits.

                      Questions about VOXL, Flight Core, ESCs and ModalAI drones are answered here by the engineers who build them.

                      Register Login
                      Reply
                      • Reply as topic
                      Log in to reply
                      • Oldest to Newest
                      • Newest to Oldest
                      • Most Votes


                      ModalAI
                      Categories Recent Tags ModalAI.com Docs
                      © 2026 ModalAI® · Accelerating autonomy for smaller, smarter, safer drones · Powered by NodeBB
                      • Login

                      • Don't have an account? Register

                      • Login or register to search.
                      • First post
                        Last post
                      0
                      • Categories
                      • Recent
                      • Tags
                      • Popular
                      • Users
                      • Groups