@modaltb Thank you for your answer, it is true that the problem is caused by the lack of magnetic compass.

With the voxl-inspect-qvio command, state flashes rapidly in both Okey and Fail states

Sometimes we were able to connect to the ground station when it was first connected to the power supply and were able to go into position mode. But after about a few minutes the connection is lost

Unable to enter position flight mode，and only see "z" value in Mavlink inspector and (x&y are zero).
And we can’t connect QGC with wifi, we use telemetry to connect QGC.
thanks for help!

Using visual indoor positioning, the flight control can't get the position information of VOXL and QGC can't get the position information of XY, there is the position information of Z axis.
Reported error: gst_rtsp_server_attach failed.
Please help!

@modaltb Thank you for your answer, it is true that the problem is caused by the lack of magnetic compass.

when I connect flight core to QGC ground station, there is no response on the dash board, using mission planner I can find the info of sensors, but the dash board no response at all.

Please help me found the problem might be ,THX!