Is DTR flow control supported?
There's a comment in comm.c in SetCommState that says it's not, but
EscapeCommFunction has a SETDTR case and a CLRDTR case.
Below are the lines I'm talking about.
I'm working on an app that asks for DTR flow control and uses overlapped
IO when using a modem. It establishes a modem connection, but then it
can't send any data over the connection. I'm using an external modem on
a serial port.
------------------------------------------------------------------------
if (lpdcb->fDtrControl == DTR_CONTROL_HANDSHAKE)
{
WARN("DSR/DTR flow control not supported\n");
}
comm.c line 1069
-------------------------------------------------------------
case SETDTR:
TRACE("SETDTR\n");
#ifdef TIOCM_DTR
direct=TRUE;
result= COMM_WhackModem(fd, 0, TIOCM_DTR);
break;
#endif
comm.c line 548
