Reading Tether turns

arend · December 14, 2020, 7:51am

Hello,
Is it possible to read Tetherturns via pymavlink or mavlink2rest ?

williangalvani · December 14, 2020, 2:43pm

Try this:

from pymavlink import mavutil

# Create the connection
master = mavutil.mavlink_connection('udpin:0.0.0.0:14550')
# Wait a heartbeat before sending commands
master.wait_heartbeat()

while True:
    msg = master.recv_match()
    if not msg:
        continue
    if msg.get_type() == 'NAMED_VALUE_FLOAT':
        if msg.name == "TetherTrn":
            print("Tether turns: %s" % msg.value)

patrickelectric · December 14, 2020, 4:45pm

Hi @arend,

Just a reminder that is also possible to fetch the value using mavlink2rest via the websocket feature:
You can use as argument --url http://192.168.2.2:4777/ws/mavlink\?filter\=NAMED_VALUE_FLOAT

github.com

patrickelectric/mavlink2rest/blob/master/examples/websocket_client.py

#!/usr/bin/env python3
import argparse
import asyncio
import aiohttp


async def start_client(url: str) -> None:
    ws = await aiohttp.ClientSession().ws_connect(url, autoclose=False, autoping=False)

    async def dispatch():
        while True:
            msg = await ws.receive()

            if msg.type == aiohttp.WSMsgType.TEXT:
                print("Text: ", msg.data.strip())
            elif msg.type == aiohttp.WSMsgType.BINARY:
                print("Binary: ", msg.data)
            elif msg.type == aiohttp.WSMsgType.PING:
                await ws.pong()
            elif msg.type == aiohttp.WSMsgType.PONG:

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arend · December 15, 2020, 3:24pm

Thank you very much for the replay @patrickelectric and @williangalvani

arend · January 19, 2021, 10:30am

Hi @patrickelectric ,
Sorry for the late replay.
When i try to fetch data i get:
aiohttp.client_exceptions.WSServerHandshakeError: 404, message=‘Invalid response status’, url=URL(‘http://0.0.0.0:4777/ws/mavlink?filter=.*’)
Unclosed client session

This happen when i try to run the example as well. Is there anything else i need to do before i can run a websocket request ?

williangalvani · January 19, 2021, 1:10pm

I believe you need to get a newer version of mavlink2rest. Download it here and replace the mavlink2rest file at ~/companion/tools/. Remember to make it executable (chmod +x).

patrickelectric · January 21, 2021, 12:05am

Hi,

@williangalvani is correct, you should have mavlink2rest 0.9.0+ version, also make sure to have the latest companion version available running.

arend · January 28, 2021, 8:02am

Thank you very much

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Reading Tether turns

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