Failing with status = StatusCode.UNAVAILABLE, details = "Socket closed"

[Berruaa]

Hello! I am using Rasperry Pi 4B (Raspbian GNU/Linux 11) connecting a drone with Pixhawk 4 (PX4 v1.13.0 firmware), using FTDI FT232BL TTL to USB. The drone can be armed but I keep getting this error message when I run the script:

import asyncio
from mavsdk import System

async def run():
    drone = System()
    await drone.connect(system_address="serial:///dev/ttyPixhawk:921600")
    status_text_task = asyncio.ensure_future(print_status_text(drone))

    print("Waiting for drone to connect...")
    async for state in drone.core.connection_state():
        if state.is_connected:
            print(f"-- Connected to drone!")
            break

    print("-- Arming")
    await drone.action.arm()
    await asyncio.sleep(3) 

    print("-- Disarming")
    await drone.action.disarm()
    await asyncio.sleep(2)

    status_text_task.cancel()

async def print_status_text(drone):
    try:
        async for status_text in drone.telemetry.status_text():
            print(f"Status: {status_text.type}: {status_text.text}")
    except asyncio.CancelledError:
        return

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(run())`

When I run the mavsdk_server:

Could you help me with issue. Thank you very much!

[JonasVautherin]

Hmm something seems weird with the connection to mavsdk_server. Can you try running mavsdk_server manually (./mavsdk_server serial:///dev/ttyPixhawk:921600), and connect to it with:

drone = System(mavsdk_server_address="localhost")
await drone.connect()

[Berruaa]

It works! Thank you very much!

[JonasVautherin]

Did you run the embedded mavsdk_server, or did you download it?

I'm just wondering why your first version has this issue :thinking:. Which version of MAVSDK are you using?

[ghost]

We used the embedded 'mavsdk_server' that came with pip3 install mavsdk.

It was the latest version, mavsdk 1.4.0