Mission Planner Can't Connect Through UDP

ArduPlane Plane 4.6
1

UDP
UDP1172×203 20.7 KB

I am trying to connect Win 11 / Mission Planner to my SpeedyBee 405 Wing /HappyModel EP2 via the ELRS built in wifi, but I am getting the above error. It connects fine using a com port over USB. I configured the transmitter and receiver according to the instructions at MAVLink - ExpressLRS. I can connect to the resulting Backpack wifi network, but when trying to connect with Mission Planner using UDP, baud rate = 460800, and port = 14550, I keep getting the above error. Netstat -an does not show that port in use, and I have the Defender firewall disabled. I also find it strange that the file paths in the error do not exist on my PC. Is there a way to troubleshoot this?

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If you have multiple GCS things running, this can happen, like mavproxy. This message means two applications are trying to listen on port 14550.

C:\Users\jkord>netstat -ano | findstr 14550
  UDP    0.0.0.0:14550          *:*                                    1631768

C:\Users\jkord>tasklist | findstr 1631768
MissionPlanner.exe         1631768 Console                    1    270,816 K

The last line will be the process number and will be different in your case, I expect you’ll see what is running.

TIL that the windows command line now supports pipes…

3

Thanks for those shortcuts. They confirmed what I was seeing when I looked at the entire output of netstat. Mission Planner is the only task listening on that port. Interestingly, I just left the error displaying and while I was using netstat, it suddenly attempted to connect, but timed out. The new error is “No heartbeat packets received.” Here are the new details. Again, C:\Users\mich1 is not a directory that exists on my PC.

Sequence contains no elements
at System.Linq.Enumerable.Aggregate[TSource](IEnumerable1 source, Func3 func)
at MissionPlanner.MAVLinkInterface.OpenBg(IProgressReporterDialogue PRsender, Boolean getparams) in C:\Users\mich1\Desktop\CubePilot\MissionPlanner\ExtLibs\ArduPilot\Mavlink\MAVLinkInterface.cs:line 886
at MissionPlanner.Controls.ProgressReporterDialogue.RunBackgroundOperation(Object o) in C:\Users\mich1\Desktop\CubePilot\MissionPlanner\ExtLibs\Controls\ProgressReporterDialogue.cs:line 111

4

On Windows you need to disable the firewall to allow unsolicited UDP to get to your applications. Disable or figure out how to allow Mission Planner through. Especially if you’re expecting a UDP stream to be initiated from the craft to your GCS Laptop

1 Like
5

Thanks, yes, Defender has always been turned off for both public and private networks. I also double-checked the UART on my flight controller to ensure that it was set to a protocol of 2 (Mavlink2) baud 460, and RSSI_TYPE=5. I think I will attack this from the radio side and make sure all of this is supported on Ethos and HappyModel. It is looking that as long as I wait for everything to initialize MissionPlanner is doing everything it can to connect.

1 Like
6

你的设置是对的。
再看看接收机是否正确。
Uploading: MAVLink.png…

Serial Protocol
MAVLINK

7

Thanks Peter. I do have that set correctly on my receiver. However, I have found that the Link Mode setting on my transmitter will not persist to the setting of MAVLink. If I leave that configuration page and return, the value always reverts back to Normal. I am filing an issue against the Lua script to narrow down whether it is a problem with the script or the module firmware.

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OK, it turns out I could only change that setting when the receiver was not linked. The setting persists now and I get a connection to Mission Planner. However, the connection dialog just spins at Getting Parameters and never loads the parameter list. I have left it for 10 minutes in case it was just a slow link. Mission Planner is updating telemetry though from the flight controller. Also once I set the UART on my receiver to the correct MavLink settings, I lose RC control from the transmitter. I’m not sure how much of this is ArduPilot related but wanted to pass it along and see if I can get it working.

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I have encountered the issue where you get telemetry but never get params. As a workaround, I set SRx_PARAMS to a nonzero value, which worked in that case.

You can probably also make sure that Mission Planner is configured to change the relevant stream rate values.

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Thanks for those tips. SRx_PARAMS was set to 10 for all streams on my flight controller. All the stream rates in MP are set to 2 with the exception of Altitude, which is set to 4, so I believe MP can change those since they are not -1. This sounds like a fairly new feature in ELRS so I may just look into a UART based wifi module instead.