ELI5 CANBUS android development

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New member
May 22, 2022
I am professional java developer, I did minor "regular" cellphone development, I am looking to implement a hobby piece of software exposing my vehicle CAN bus to the internet via 4G.

Q1: what is "external CAN bus decoder"? are there android units with CAN bus input which I can access from my won app?
Q2: I can put my own software on those head units just as I can put my own software into my android phone right?
Q3: any recommendations for a drama-free unit to play with custom apps with CANbus and 4G connectivity?
Q4: any open source java code with canbus more or less any subject just for inspiration?

Andrey, the rusEFI guy

Thank you :)