(WiFi UDP) Mission Planner/QGC connection is good, but mavproxy shows “data link lost”

I want to set up a WiFi LAN, mavproxy forwards the data, Mission Planner/QGC communicates well with the vehicle (UDP), but the Mavproxy connection fails. Show “data link lost”.
The command “link”, the data is largely lost.
How can I solve this problem? Thank you!