Receives a packet, then returns a tuple containing (cls, pkt_data, time)

def recv_raw(self, x=MTU):
        """Receives a packet, then returns a tuple containing (cls, pkt_data, time)"""  # noqa: E501
        pkt, sa_ll = self.ins.recvfrom(x)
        if self.outs and sa_ll[2] == socket.PACKET_OUTGOING:
            return None, None, None
        ts = get_last_packet_timestamp(self.ins)
        return self.LL, pkt, ts