Freematics Forum

We just found the initializing procedure may have too short timeout value (2 seconds) for some cars. Could you try delaying for some time after ATZ command is issued.

Indicating power and OBD activity.

After switching protocol, re-connect the device.

Yes, this is an option. We can credit you 80% for a used item if it remains intact.

What you've got is 3.2" LCD instead of 2.8". It seems you did that wrong in config.h.

This might be an individual case of compatibility issue. Meanwhile I have no idea and I will discuss with my partner for possible cause.

It is possible to change everything. It is open-sourced. You get the source code and can modify it to fit your application.

BLE does need pairing. It is connected programatically. BT SPP needs pairing.

24V voltage should be no problem. You also need to check the protocol. Some trucks use J1939 which our OBD-II adapter does not support.

Our OBD-II adapter does not suppot J1850.