After sending SLEEP0000 0 the tracker starts sending messages, and it doesn't stop after 5 minutes as before.
If I send SLEEP0000 1 , the messages stop after 1 minute.
This setting shouldn't be correct, since the interval of sending is set at 10 minutes, and SLEEP (if set) should be set to a larger time then the normal interval of sending.
Welcome to the club! My traccar version is 6.7.3. Do you have an ST-901L 4G? If so, then we have the same problem. It doesn't work properly on external servers, but it does work ‘somehow’ on the SinoTrack server, and I have the same problems as you on traccar. I emailed a sales manager at SinoTrack and didn't get any useful information on how to fix it, just a bunch of nonsense and a request to enter the usual commands, but nothing changed. I suspect that we've ended up with a Chinese GPS that officially reports its location to the regulatory chinese authorities every 2 seconds.
I am not sure if it has to do with traccar itself. I do not know if traccar can change the behavier of the tracker. There are a lot of 'secret' commands for this device existing, but nothing stops that 2 sec. send-intervall. And .... I do not play around any longer with that junk!
It should have something to do with an aknowledgement which needs to be send to confirm the receipt of the message. I think the tracker keeps on sending the same message again untill it receives an aknowledgement.
That is why 6.9 works better then 6.6 - some work has been done to implement this, but I think something is still missing.
It is not the 'HQ...' message which is being resend, but another message starting with a nr.
I haven't found yet what needs to be send to answer.
And yes, somebody at SinoTrack responds to questions, but doesn't respond with an answer to the above question ...
It looks like you have SLEEP set up.
Try turning it off by sending SMS
SLEEP0000 0
where0000
is your PIN