FL_NEED_RESEND
if (sc->state & FL_NEED_RESEND) {
sc->state |= FL_NEED_RESEND;
sc->state &= ~FL_NEED_RESEND;
sc->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
sc->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
if (sc->state & FL_NEED_RESEND)
sc->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);