We have just added CAN bus sniffing APIs to the Arduino library for Freematics ONE+. A simple CAN bus sniffing example sketch is also added.
![](https://blog.freematics.com/wp-content/uploads/2019/03/can_sniffing.png)
![](https://blog.freematics.com/wp-content/uploads/2020/11/can_sniffing_linux-1024x492.png)
CAN sniffing is interesting if you are have some insider information or good at reverse engineering, so some vehicle data outside the scope of standard OBD-II PIDs can be extracted.
Another product supporting CAN sniffing at the moment is Freematics OBD-II UART Adaper V2.1. This post has some information about the AT commands for CAN sniffing.