Don't throw out pending rx data in zmodem_recv_init().
Don't reset the file position to an illegal offset from received ZRPOS. Send empty ZCRCW frame if ZRPOS to end of file (like HT does on "skip"). Avoid sending empty ZCRCW on files evenly divisible by 1024 (don't use feof).
Showing with 22 additions and 10 deletions