Release request: slcan on Windows loses frames on 4.6.1, fixed on main #2121

Hi @zariiii9003,

Could a 4.6.2 or 4.7.0 be released that includes #2028? On Windows, the slcan interface in 4.6.1 loses frames whenever the bus is busy, and #2028 fixes it, but it is only on main so far.

What we see. The device under test sends 10000 frames to a CANable adapter running slcan firmware. With 4.6.1 the host receives between some fraction of (about half) them, and then nothing more arrives. The same test on Linux receives all 10000 frames.

slcanBus._read in 4.6.1 calls serial.read(1) once per byte. On Windows each call is a separate request to the serial driver. Bytes are dropped.

#2028 fixes it...

Until there is a release, we replace slcanBus._read in our own test tooling.

Thanks for all your efforts with python-can!