python 简单的udp发送和接收

server端 

# udp_gb_server.py
'''服务端（UDP协议局域网广播）'''

import socket,time,struct

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

PORT = 6454

network ='127.0.0.1'# '<broadcast>'
s.sendto('Client broadcast message!'.encode('utf-8'), (network, PORT))


def formatdata(dvcid,dat):
    sendBuf=[0x41, 0x72, 0x74, 0x2D, 0x4E, 0x65, 0x74, 0x00, 0x00, 0x50, 0x00, 0x0E, 0x77, 0x01]

    #sendBuf[14]设备节点
    #sendBuf[15] = 0x00;
    sendBuf.append(dvcid& 0xff)
    sendBuf.append(0x00)

    # 发送的字节数 512
    #sendBuf[16] = 0x02;
    #sendBuf[17] = 0x00;
    datlen = len(dat)
    sendBuf.append((datlen & 0xff00) >> 8)
    sendBuf.append(datlen & 0xff)
    # 发送的数据
    #sendBuf[17+n] = 0x00;
    print( datlen)

    for x in range(datlen):
        pass
        sendBuf.append((dat[x] & 0xff))#.to_bytes(1,'big')
    #data = [1, 2, 3]
    #buffer = struct.pack("!ihb", *data)

    packstyle=str(18+datlen)+'B'#B 0-255
    #req = struct.pack('14b',*sendBuf) 0-127
    req = struct.pack(packstyle, *sendBuf)
    return req


import struct
from ctypes import create_string_buffer
def pack():
    # 创建一个9字节大小的缓存区，初始化默认全部为\x00 
    buf = create_string_buffer(9)# buf.raw: '\x00\x00\x00\x00\x00\x00\x00\x00\x00'

    # 冲缓存区buf的第0个字节开始打包两个4字节无符号整型数据1和2
    struct.pack_into(">II", buf, 0, 1, 2)#  buf.raw: '\x00\x00\x00\x01\x00\x00\x00\x02\x00'
    # 然后我们想再打包一个布尔型数据到buf中就可以改变以下偏移量
    struct.pack_into(">?", buf, 8, True)# buf.raw: '\x00\x00\x00\x01\x00\x00\x00\x02\x01'
    return buf

c=0
while True:
    c=c+1
    d=[200,1,2,3,4,5,6,7]
    #d = [0 for i in range(512)]
    a= []
    for i in range(512):
        a.append(i)#'''
    print(a)
    print(c)
    #senddata(2,d)
    req = struct.pack('8B', int('3F', 16), int('20', 16), int('63', 16), int('31', 16), int('0D', 16), int('0A', 16), int('0D', 16), int('0A', 16))

    #s.sendto((b"\x78\x78\x11\x01\x07\x52\x53\x36\x78\x90\x02\x42\x70\x00\x32\x01\x00\x05\x12\x79\x0D\x0A"),(network, PORT))
    #s.sendto(req, (network, PORT))
    s.sendto(formatdata(128,a), (network, PORT))
    #s.sendto(pack(), (network, PORT))
    time.sleep(1)


'''
byte[] sendBuf = new byte[530];//设置发送缓存区

            //41 72 74 2D 4E 65 74 00 00 50 00 0E 77 01
            //按照协议报文填充数据

            //固定格式
            sendBuf[0] = 0x41;
            sendBuf[1] = 0x72;
            sendBuf[2] = 0x74;
            sendBuf[3] = 0x2D;
            sendBuf[4] = 0x4E;
            sendBuf[5] = 0x65;
            sendBuf[6] = 0x74;
            sendBuf[7] = 0x00;
            sendBuf[8] = 0x00;
            sendBuf[9] = 0x50;
            sendBuf[10] = 0x00;
            sendBuf[11] = 0x0E;
            sendBuf[12] = 0x77;
            sendBuf[13] = 0x01;

            //设备节点
            if (Convert.ToInt16(textBox7.Text) > 0 && Convert.ToInt16(textBox7.Text) < 5)
            {
                sendBuf[14] = Convert.ToByte(Convert.ToInt16(textBox7.Text)-1);
            }
            else
            {
                MessageBox.Show("设备节点输入有误");
            }
            sendBuf[15] = 0x00;

            //发送的字节数
            sendBuf[16] = 0x02;
            sendBuf[17] = 0x00;


            //后面的字节就是DMX512对应的512个通道的数据了
            
            
            if (Convert.ToInt16(textBox1.Text) >= 1 && Convert.ToInt16(textBox1.Text) <= 512 && Convert.ToInt16(textBox2.Text) >= 0 && Convert.ToInt16(textBox2.Text) <= 255)
            {
                sendBuf[17 + Convert.ToInt16(textBox1.Text)] = Convert.ToByte(textBox2.Text);
            }
            else
                MessageBox.Show("通道或数值参数输入有误");





'''

client端

# udp_gb_client.py
'''客户端（UDP协议局域网广播）'''

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

PORT = 6454

s.bind(('127.0.0.1', PORT))
print('Listening for broadcast at ', s.getsockname())

while True:
    data, address = s.recvfrom(65535)
    print('Server received from {}:{}'.format(address, data))