Didier,

Am 25.02.21 um 00:15 schrieb didier@ernotte.com:

I can easily read a PID value using the shell syntax in the web browser : "obdii can1 request device 7e4 7ec 22ddd00" for example.

I understand that "0x22" is used to read data by identifier, and I read that "0x2E" would be used to write data by identifier but what would be the correct syntax to write a value to a PID in the shell ? or it is not possible yet ?

You can send any OBD request that fits into a single frame.

If 2E is the write command for your device & PID (there are others and even non standard ones), it's simply…

obdii can1 request device 7e4 7ec 2e<pid><value>

The poller doesn't yet support multi frame requests (only responses), so the max request length for standard addressing mode is 7 bytes, leaving 4 bytes payload for a 16 bit PID command.

See ISO 15031 and ISO 14229 for standard OBD/UDS requests and responses.

Regards,
Michael

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