Create Mavlink message to inject in Cockpit

Blue Robotics Software
1

Hi All,

I’m trying to display a custom value in Cockpit as a NAMED_VALUE_FLOAT message sent from my surface computer with a Python script, but Cockpit never shows it in the MAVLink Inspector.

Is there any guide or reference to do it?

Thanks in advance

2

There’s a chance the message is arriving but as there are many other NAMED_VALUE_FLOAT messages incoming, you never see yours.

An easier way to debug that is opening Menu>Tools>DataLake, searching for NAMED_VALUE_FLOAT and checking if your variable is there.

3

Please consider the python script is located on the topside PC . So i’m attempting to inject it directly into Cockpit. The Test script is the following but after i tried i’m unable to locate the paramenter inside the datalake:

#!/usr/bin/env python3
from pymavlink import mavutil
import time

# Try sending directly to BlueOS telemetry ports
TARGET_IPS = [
    ("udpout:192.168.2.2:14550", "Main Cockpit port"),
    ("udpout:192.168.2.2:14552", "Alternate telemetry"),
    ("udpout:192.168.2.2:14600", "Extra test port")
]

for conn, label in TARGET_IPS:
    print(f"\n[TRY] Sending to {conn} ({label})")
    try:
        m = mavutil.mavlink_connection(conn, source_system=245, source_component=191)
        for i in range(5):
            value = -0.812 + 0.001 * i
            m.mav.heartbeat_send(18, 8, 0, 0, 4)
            m.mav.named_value_float_send(int(time.time()), b"CP_VOLT\x00\x00\x00", value)
            print(f" → Sent CP_VOLT={value:.3f}")
            time.sleep(1)
        m.close()
    except Exception as e:
        print(f"[ERR] {e}")
4

Oh, ok, this changes things a little bit!

We didn’t merge yet the consumption from MAVLink sources other than the main vehicle. Coincidently I was working on that during last week and the PR is open for review. I would ask you to test it from those binaries, which also includes some modifications on Menu>Tools>DataLake to make it easier to find your data.

To enable it, go to Menu>Settings>General on Cockpit and click “Enable Pirate Mode”. After that go to Menu>Settings>MAVLink and click “Enable DataLake variables from other systems”. Than you can use Menu>Tools>DataLake to find your data. It should be under /mavlink/system=X/component=Y being X and Y the MAVLink SystemID and ComponentID of your script.

1 Like
5

Hi Rafael,

thanks for the quick reply.

I’ll have a look asap and come back on it.

6

I’ve downloaded and installed the Version 1.17.0-beta.7 . Can you confirm the “Enable DataLake variables from other systems” is something that need to be enabled somewhere? I’ve not found anything related on it.

7

It’s not on Beta7. It’s in the binaries from the PR (not merged yet) that I mentioned in my previous comment: Improve reading names on the DataLake tools menu · bluerobotics/cockpit@cbd71a8 · GitHub