Configure PAJ PET Finder 4G for Traccar

Sebastian5 days 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 :(

GPS4PETS5 days 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

GPS4PETS5 days ago

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

Sebastian5 days 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#

Sebastian5 days ago

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

Sebastian5 days ago

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

GPS4PETS5 days ago

good to hear.

the trackers are a bit picky

Sebastian5 days ago

@GPS4PETS thanks for your support and software!

Sebastian5 days ago

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

GPS4PETS4 days 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

GPS4PETS4 days 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

GPS4PETS4 days 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

GPS4PETS4 days ago

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

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

GPS4PETS4 days ago

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

Sebastian4 days ago

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

Clever idea to sniff the commands on the interface ;)