4.92/Rx buffer bug with ymodem
this bus has already been reported (#34824 or #33708) with older version but still present.
As you can see on log, teraterm takes as input data, the 'C' my program sends. Problem is that the 'C' is sent before starting transfer. This brings then my program to retransmit several times the same packet until getting ACK from teraterm.
I think a quick issue could be to flush Rx buffer when starting transfer.
What do you think?