CAN Transport layer

[vChavezB]

First of all thanks for this project, it looks like a promising alternative to the rust and go variants :)

I just wanted to give an idea. I am working at the moment with some automotive mcus from NXP with Zephyr. The devices I am building only have a CAN interface. For this reason in the near future I might need to add a transport layer to MCU Boot with CAN.

I like the smpclient project as it has an abstraction to add more protocols, so thanks for that!

My proposal is to add a CAN interface. The project from https://github.com/hardbyte/python-can might be a good solution to abstract CAN with python.

If we decide to add CAN support we will probably use this project as a starting point. 👍

[JPHutchins]

Adding this discussion for context since CAN was validated to some extent: intercreate/smpclient#19

MCUBoot fork/commit with CAN as SMP transport: vChavezB/mcuboot@60872b4