#MAVLink Telemetry Passthrough not working

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wind glen
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Good morning,
I am having trouble trying to link my RadioMaster TX12 MKII to QGroundControl.
I am using Ubuntu 22.04 and QGroundControl with AppImage.

The complete build is:

  • Pixhawk 6x
  • Matek ExpressLRS R24-D
  • RadioMaster TX12 MKII

At the moment, my controller works fine for RC and the controller can see telemetry, allowing me to see battery, GPS, etc.
The problem I have is when connecting the TX controller to my PC to see the telemetry through QGroundControl, I can't see anything, I can't even get the link using mavproxy.py.
I'll explain my procedure and configuration in case anyone can help me:

In RadioMaster TX12:

  • Hardware Setup:
    • Serial Port, AUX1: OFF, USB-VCP: Telem Mirror
    • Internal RF, Type: CRSF, Baudrate: 115k

In the Tools -> ExpressLRS (Lua Script) section:

  • Packet Rate: 250Hz
  • Switch Mode: Hybrid
  • Link Mode: MAVLink

My Matek R24-D is connected via Telem2 to my Pixhawk 6X, and Pixhawk 6X is configured as follows:

  • SER_TEL2_BAUD: 460800 8N1
  • MAV_0_CONFIG: TELEM2
  • MAV_0_RATE: 9600 B/s
    The controller connects to the /dev/ttyACM0 port on my computer.

RadioMaster TX12 Backpack:

  • DVR Rec: OFF
  • DVR Srt Dly: 0s
  • DVR Stp Dly: 0s
  • HT Enable: Off
  • HT Start Char: AUX1
  • Telemetry: ESPNOW (or Wi-Fi)

I've tried Wi-Fi Backpack with QGroundControl with UDP port 14550, but also not receiving anything on QGroundControl.
Whenever I connect Pixhawk 6x to QGroundControl, everything works perfectly and I can configure the Pixhawk correctly.

Controller versions:
Both the RadioMaster TX12 MKII and Matek ExpressLRS R24-D controllers have ExpressLRS version 3.5.2, and the TX12 MKII has Backpack version 1.5.1.

Once the controller is linked to the Matek R24-D, I connect the controller to my computer (USB Serial VCP) and I cannot see telemetry data with either QGroundControl or mavproxy.py.
I would appreciate any help and information about mistakes I may have made.

stray sageBOT
# wind glen Good morning, I am having trouble trying to link my RadioMaster TX12 MKII to QGr...

✨AI-Generated response✨

To use MAVLink telemetry with your RadioMaster TX12 (Internal ELRS), you must use the TX Backpack WiFi method. A USB cable from the TX to a PC does not support MAVLink forwarding for internal modules; it is only an option for external modules.

  1. In the ELRS LUA script, ensure Link Mode is set to MAVLink.
  2. In the Backpack section of the LUA, set Telemetry to WiFi.
  3. Connect your PC to the WiFi access point named ExpressLRS TX Backpack xxx (password: expresslrs).
  4. In QGroundControl, create a UDP connection using port 14550.

Note: Since you are using an internal module, the USB-VCP setting in your radio's Hardware menu should be set to CLI, not Telem Mirror.

For more details, see the MAVLink configuration guide.

please follow up in #help-and-support or #general-quad-help

-# {'cause': 'thread creation'}

summer osprey
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#mavlink-rc message

wind glen