Scripting/GCS_MAVLink: set-message-interval doesn't appear to work for some Network ports

[rmackay9]

In this year's Japan Innovation Challenge (JIC) our vehicle uses Ethernet to connect the autopilot, camera and companion computer (setup as described here). With this setup the autopilot creates a mavlink connection using these params:

• NET_P2_TYPE = 2 (UDP Server)
• NET_P2_TYPE = 2 (MAVLink 2)
• NET_P2_IP0/1/2/3/Port: 0,0,0,0,14560

BlueOS running on the RPI then connects to the autopilot as a UDP Client. The GCS connects to BlueOS again as a UDP Client.

We've noticed that the set-message-interval.lua example script does not seem to work no matter what value we set the "serial_port" to. The regular set-message-interval run from a GCS (e.g. Mission Planner) does work however.

I don't think the problem is within the script though, instead I think maybe there's an issue in either GCS_MAVLink:: get_channel_from_port_number() or AP_SerialManager::get_serial_by_id() function.

[magicrub]

If you're using Mission Planner or MAVProxy, are you aware of how they overwrite the stream rate params upon connect? Not necessarily your problem here.. just wanted to make sure you're aware of it.

[magicrub]

@rmackay9 Have you tried applying the Network's virtual serial port number offset? https://github.com/ArduPilot/ardupilot/blob/master/libraries/AP_SerialManager/AP_SerialManager_config.h#L68