The reason of the problem with ioctl(tty_fd, TIOCSETD, N_TTY) is
that modem turn off RTS, and tty_driver can't sent bytes to
modem, but LCP echo requests is in tty bufer & driver can't
change line discipline while in bufer there are some bytes,
but modem never turn RTS on. To reset this situation I must
turn DTR off or flush output bufer or turn off CTS/RTS flow
control in driver, but all of this impossible with N_PPP
discipline.
Any sugestition how fix this problem ?
Stanislav Voronyi.
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