CAN transmitting

[theogonzalez]

Hello,

I am investigating to replace my current SKODA Connect service with one of my own, DIY. I came across the freematics devices which are perfect for my project, however, there is something missing, CAN bus transmission.

Sorry if I do not fully understand how car buses work, my though are: Sniff the CAN bus for door lock/unlock messages and then re-transmit them to perform the action myself.

Just sniffing CAN bus is enough to know if the car is locked and will fullfil 99% of my requirements but what about retransmitting those messages? Is that even possible? How? Are these devices capable? Maybe with some work in the library?

Thanks.

[limeglum]

Yes, it is possible to retransmit CAN bus messages using devices like Freematics, but you may need to modify or develop additional functionality in the library to handle message injection.

[flippantvessel]

Most Freematics devices can send and receive CAN messages, but you'll need to confirm the specific model and its capabilities.

[IlaHaley]

Retransmitting messages to perform actions such as unlocking a door is technically possible but may require modifying the Freematics library. Retransmitting over the CAN bus can present challenges such as determining the correct message ID and ensuring proper signal timing.