[$1000 bounty +community] Rivian: read set speed

[adeebshihadeh]

Rivian longitudinal control is ready to go... we just can't read the set speed or the button presses from the car.

This bounty is for something that can ship to openpilot release, so should be the same harness, no FW flashing, etc. We can consider a "sub bounty" for something that's alpha-long quality, but really we want this to ship to release.

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EDIT: the communtiy has organized a GoFundMe for additional incentive on the project.

[abhishek818]

@adeebshihadeh Is this open to external contribution?

[BBBmau]

(https://github.com/adeebshihadeh) Is this open to external contribution?

all issues are open to anyone but bounties tend to be geared for external ones.

[andiradulescu]

can you share a route?

[gerrylum]

can you share a route?

I made sure to do a lot of set speed changes and follow distance changes:
https://connect.comma.ai/2d2da5dea63b5c5e/00000031--0d63761b15/215/893