NG_BTSOCKET_RFCOMM_DLC_SENDING
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_SENDING;
if (!(pcb->flags & NG_BTSOCKET_RFCOMM_DLC_SENDING)) {
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_SENDING;