Configure PAJ PET Finder 4G for Traccar

Sebastiana month ago

@GPS4PETS: strange, i can see the messages on boot and shutdown, but commands send by serial do nothing. I testet two of my usb ttl converters without success :(

GPS4PETSa month ago

@Sebastian do ou use a ttl converter vor 3.3V or 5V?
you need one for 3.3V

i am using SSCOM:

https://www.gps4pets.de/de/downloads/SSCOM.zip

just got a new pet tracker 4g today and rewriting the h02 protocol

GPS4PETSa month ago

i am using a ch340 3.3V USB2TTL interface.
tested a pl2303 but that had the same problem like you

Sebastiana month ago

I tried two pl2303 and in this moment an ch340 3.3V interface. the problem persists, reading of bootloader and other messages works, sending an command (was corectly echoed by device self) returns nothing.

I was sending AT%TEST=START#

Sebastiana month ago

Bildschirmfoto vom 2025-03-29 21-48-06.png

Sebastiana month ago

@GPS4PETS With an windows laptop and your SSCOM it works :D

GPS4PETSa month ago

good to hear.

the trackers are a bit picky

Sebastiana month ago

@GPS4PETS thanks for your support and software!

Sebastiana month ago

@GPS4PETS did you manage to get light and sound activated via protocol / traccar commands?

GPS4PETSa month ago

i am at debugging stage.
one tracker is bound to original paj portal and i sniff traffic via the onboard usb interface of the lte modul

i will publish all my findings here

GPS4PETSa month ago

it reacts on S20 commands (curoff / recover engine).
but not on other standard commands like S26 for device information or CR for sending location

GPS4PETSa month ago

Found this for controlling light and sound with h02 protocol:

light on
*HQ,YYYYYYYYYY,X2,062108,1#

light off
*HQ,YYYYYYYYYY,X2,062108,0#

sound on
*HQ,YYYYYYYYYY,X1,062108,DURACTION_IN_SECONDS#

sound off
*HQ,YYYYYYYYYY,X1,062108,0#

YYYYYYYYYY = your tracker ID

GPS4PETSa month ago

livemode on
*HQ,YYYYYYYYYY,X5,062108,5,DURATION_IN_SECONDS#

livemode off
*HQ,YYYYYYYYYY,X5,062108,5,10#

GPS4PETSa month ago

WiFi Scan
*HQ,YYYYYYYYYY,CHWALL,062108,#

Sebastiana month ago

@GPS4PETS light and sound works with your commands and original firmware, great!

Clever idea to sniff the commands on the interface ;)