CRX DVR GPS unit
What server? What data?
Ive set up a traccar server using Ubuntu on Hetzner. Its recieving an initialize and a server check, but not any GPS data. Im fairly new to this, so not quite sure what i'm doing!
Please provide logs.
I dont have access to the ssh at the moment (im away from my desktop)
Its a CRX3008 MDVR attempting to connect to a self-hosted Traccar 6.13.3 server on Ubuntu.
Traccar recognises the incoming protocol as cellocator.
Current setup:
- Server IP: 188.245.150.94
- Port: 5033
- LiveTrack2 selected (manufacturer confirmed LT2 contains GPS)
- Device online and recording
- GPS active on device
- Connection via onboard 4G router + Ethernet
The device successfully reaches Traccar and repeatedly sends:
- POST /Initialize
- POST /ServerCheck
- Content-Type: application/dms4; version=5.5
But no device/position appears in the Traccar GUI.
Example logs:
2026-05-09 16:08:51 INFO: [T63f7df10: cellocator < 31.94.29.2] POST /Initialize HTTP/1.1
Host: 188.245.150.94:5033
Accept: */*
Content-Type: application/dms4; version=5.5
Connection: Keep-Alive
User-Agent: dms_api/1.0
Content-Length: 113
2026-05-09 16:08:51 INFO: [T63f7df10: cellocator < 31.94.29.2] 120030303a31343a45373a31433a32443a3242000900445036372042484100010000010000ea0705091008330000000348f949b507b9b440f302eca3532d69c0000000009f000000000000000000000004003f0004000a004343472d312e332e300003003f0020fd7000dcccff40010000
Later it settles into periodic:
POST /ServerCheck
Content-Length: 0
The manufacturer stated:
- LiveTrack2 contains GPS coordinate PINGs
- DRV data contains telemetry including GPS
- uploads occur every 10 minutes
- no licensing/provisioning required
Do you know whether:
- Traccar’s Cellocator decoder supports SmartWitness CRX/DRV uploads?
- The GPS/device ID is visible inside the payload above?
- There’s a different protocol/port that would be more appropriate?
So you do have logs or you don't have logs? What are these logs?
Ive got 4 ex NHS ambulances and i'm trying to get the DVR/Telematics unit back to life. Ive set up a server, and the server is receiving data, but showing as offline in the GUI.
Any thoughts?