问python3套接字只接收来自netcat的数据

EN

#!/usr/bin/python3

import socket, threading, time
import datetime, sys



def main():
    """
    MAIN
    """
    #udp = rxUdp()
    #udp.startUDPRx()

    udp_ip = '192.168.1.100'
    udp_port = 6022

    sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM) #IP/UDP
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    sock.bind(('', udp_port))
    #sock.bind(('eth1', 0))


    expected_rtp_seq = None
    print('Running')
    ts_file = open('test.ts', 'wb')
    #while True:
    for i in range (1, 1000):

        data = b''
        data, addr = sock.recvfrom(1500) #buffer size
        rtp_sequence_no = data[2:4]
        rtp_sequence_no = int.from_bytes(rtp_sequence_no, byteorder='big')

        rtp_len = data[19:20]

        mpegts_data = data[12:len(data)]
        print(rtp_sequence_no)
        print('.', end='')
        sys.stdout.flush()
        ts_file.write(mpegts_data)
        print(len(data))      
        if expected_rtp_seq == None:
            expected_rtp_seq = rtp_sequence_no
        if expected_rtp_seq != rtp_sequence_no:
            print('\n%s: Sequence Mismatch.  Expected %d, got %d' %
              (datetime.datetime.now(), expected_rtp_seq, rtp_sequence_no))
            expected_rtp_seq = rtp_sequence_no

        if expected_rtp_seq == 65535:
            expected_rtp_seq = 0
        else:
            expected_rtp_seq += 1


    ts_file.close()



if __name__ == '__main__':
    main()