LTE connection issues

Hello, i’m trying to connect my boat over lte for weeks now, I have a 4g router, and a pi zerow connected to the pixhawk.

here is what I tried :

  • tcp with ngrok and mavproxy : working both way (telemetry and WP updates) and i managed to have a script working for auto connect.
    problem : very high latency, sometimes 2 minutes of latency on the telemetry…

  • udp with zerotier and mavproxy : Not working well, I mean I have no latency on the telemetry, but I can’t working on WPs (can’t read or write WPs) and MP crash when I try to modify WP_speed for example.
    And I need to retry to download parameters from board 9 times /10

Thank you in advance for your help