Chris,

Am 04.02.25 um 23:49 schrieb Chris Box:

Am 15.01.25 um 11:11 schrieb Michael Balzer via OvmsDev:

Speaking of the Leaf, the code there actually does something fishy in `CommandWakeup()`:

unsigned char data = 0;
...
m_can1->WriteStandard(0x5C0, 8, &data); //Wakes up the VCM (by spoofing empty battery request heating)

I agree that is dodgy. It's going to write 8 bytes of data onto the bus, but only the first byte's contents are known. The other 7 are nondeterministic - just whatever happened to be on the stack at that time. This doesn't seem like a recipe for predictable operation.

I'd say that seems like a recipe for an occasional car fault condition. If the message needs to be 8 bytes long, I'd expect the car to normally also process all 8 bytes.

The commit was https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/commit/09c58a2feda13c32f79c6599fdcb6a7512cf1a48 by dalathegreat.

Unfortunately my CAN knowledge is close to zero so I can't comment on the messages themselves.

You could try if the 8 is the error here by replacing that by 1, and if that then no longer works, you could try making data a deterministic 8 null bytes frame.

Regards,
Michael

-- 
Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
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