Heading or Bearing

I also noticed that sometimes they don't send the speeds, and never heading 8)

id=61171705&lat=xx.1921871&lon=yy.9033072&timestamp=1785438639&accuracy=19.44499969482422&altitude=146.50001525878906&batt=64&charge=false
id=61171705&lat=xx.1921449&lon=yy.9032632&timestamp=1785438678&accuracy=20.856000900268555&altitude=146.3000030517578&batt=64&charge=false
id=61171705&lat=xx.19214074&lon=yy.90311832&timestamp=1785438780&accuracy=12.252382278442383&altitude=168.241455078125&speed=0.0&batt=63&charge=false

ok, 5 days i tested client on 5 phones, all samsung, nobody dont send heading-bearing-course :(
app version 10.0.7

What accuracy valuea do you get?

10-20 meters

That sounds like WiFi based location accuracy. For some reason your devices don't want return GPS and fallback to WiFi instead.

I just drove to the petrol station and back specifically to test it, with Wi-Fi turned off. The tracks from my phone and the tracker match. I checked the log of what the phone is sending, and there was no course/bearing information. And again, this issue only started after an update a couple of weeks ago.

And there’s one more problem :) I added your demo server as a second URL to several Teltonika trackers. One of the trackers is showing me its location from a month ago, but when I check its history, everything is correct up to the latest data :)

P.S. I’ll probably just quickly make my own client to suit my needs ;)

Let's not pile more things into this thread. From my understanding, Teltonika uses second server as a backup, so it is expected that you won't receive anything, unless the main server is down. Not sure if that's behavior is configurable. But if you want to discuss this, I recommend a separate thread.

As for the app, heading information is coming directly from the location provider on your phone. We don't do any calculations. If it worked before, then something must have been different. What is the exact configuration you're using?

one day system location, next off

What about the rest?

I checked the database to see what we're receiving from the rest, and there's no direction vector there either. Samsung A55, A56, A57 phones.

Closing the topic, we found a solution for ourselves. We'll take the angle between the last two points.