RFCOMM_V24_FC
if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
d->v24_sig |= RFCOMM_V24_FC;
d->v24_sig &= ~RFCOMM_V24_FC;
v24_sig |= RFCOMM_V24_FC;
v24_sig &= ~RFCOMM_V24_FC;