To change the ELM327's serial settings, please refer to its data
sheet. This needs to be done before attaching the line discipline.
+Once the ldisc is attached, the CAN interface starts out unconfigured.
+Set the speed before starting it:
+
+ # The interface needs to be down to change parameters
+ sudo ip link set can0 down
+ sudo ip link set can0 type can bitrate 500000
+ sudo ip link set can0 up
+
+500000 bit/s is a common rate for OBD-II diagnostics.
+If you're connecting straight to a car's OBD port, this is the speed
+that most cars (but not all!) expect.
+
+After this, you can set out as usual with candump, cansniffer, etc.
+
Known limitations of the controller