DATA_STREAM rate of Mavlink mesages

Brian_Duvall · April 24, 2019, 1:10am

Hello all,
I am trying to use the DATA_STREAM common Mavlink message to verify the send rate. Here is the docs for how to spell out the DATA_STREAM message:
https://mavlink.io/en/messages/common.html#MAV_DATA_STREAM_ALL

I have added to this code to read the DATA_STREAM message:

gist.github.com

https://gist.github.com/vo/9331349

gistfile1.py

#!/usr/bin/env python

import sys, os
from optparse import OptionParser

# tell python where to find mavlink so we can import it
sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../mavlink'))
from pymavlink import mavutil

def handle_heartbeat(msg):

This file has been truncated. show original

Here is the code with the addition of DATA_STREAM
Mavlink_reader.txt (3.1 KB)

The problem is I never see the DATA_STREAM message go by to call DATA_STREAM.message_rate.

Dose anyone have any ideas??

Running code on laptop to original pixhawk with ArduPlane 3.9…

Thanks!

amilcarlucas · April 24, 2019, 11:45am

Instead of MAV_DATA_STREAM_ALL, use MAV_DATA_STREAM_POSITION or one of the others, It will work.

Brian_Duvall · April 24, 2019, 12:32pm

Thank you! I will try it today

Brian_Duvall · April 24, 2019, 4:59pm

Instead of MAV_DATA_STREAM_ALL, use MAV_DATA_STREAM_POSITION

So I tried the above statement with no success unfortunately. I don’t think this is my problem.

Take a look at the image below in the section that has the comment grab a mavlink message. Then find handle the message type. For all the message types except DATA_STREAM I can get. So for some reason this message type is not in any of the messages collected. All I want is to see at what rate the mavlink messages are being sent. Maybe there is a better way to do this…

Thank you for the help!

Brian_Duvall · May 6, 2019, 8:35pm

Solved,
I just created a while loop that runs for one second and counted the number of times I received my desired data type. Also in order to actually get the 50 hz rate I had to change the INS_FAST… parameter for IMU ONE and TWO in order to get the raw_imu data out at 50 hz