python udp广播发送但收不到

Question

我正在尝试一个应该稍后自定义的基本脚本，但现在我需要它从连接的网络 raspberry Pi 向同一网络上的多台笔记本电脑发送摄像头源。

我将 udp 流式传输到具有特定设备地址的单个设备，并使用以下代码作为 a，它就像一个魅力，从来没有任何问题

发件人

class FrameSegment():
    """ this class inits the socket in the main file then sends the frames of a video in a loop with the udp_frame method """
    MAX_IMAGE_DGRAM = 2**16 - 64 # minus 64 bytes in case UDP frame overflown

    def __init__(self, port=5000):
        self.s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # for linux use SO_REUSEPORT
        self.s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        self.s.settimeout(0.2)
        self.PORT = port

    def udp_frame(self, img):
        compress_img = cv2.imencode(".jpg", img)[1]
        dat = compress_img.tostring()
        size = len(dat)
        num_of_segments = math.ceil(size/(self.MAX_IMAGE_DGRAM))
        array_pos_start = 0

        while num_of_segments:
            array_pos_end = min(size, array_pos_start + self.MAX_IMAGE_DGRAM)
            msg = struct.pack("B", num_of_segments) + dat[array_pos_start:array_pos_end]
            self.s.sendto(msg, ('192.168.1.110', self.PORT))
            array_pos_start = array_pos_end
            num_of_segments -= 1

接收者

class RovCam():
    """ inits the socket in main then reads the transmitted data from said socket in a loop to display the video """
    MAX_DGRAM = 2**16 - 16

    def __init__(self,port=5000):
        self.s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # for linux use SO_REUSEPORT
        self.s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        self.s.bind(("", port))
        self.dat = b''
        self.dump_buffer()
        print("ROV CAM : Connected successfully")

    def dump_buffer(self):
        while True:
            seg, addr = self.s.recvfrom(self.MAX_DGRAM)
            if struct.unpack("B", seg[0:1])[0] == 1:
                break

    def read(self):
        seg, addr = self.s.recvfrom(self.MAX_DGRAM)
        while struct.unpack("B", seg[0:1])[0] > 1:
            self.dat += seg[1:]
            seg, addr = self.s.recvfrom(self.MAX_DGRAM)
            
        self.dat += seg[1:]
        img = cv2.imdecode(np.fromstring(self.dat, dtype=np.uint8), 1)
        self.dat = b''
        return img

但是问题是如果我像这样将接收设备的地址更改为广播地址 ** 在发件人文件中**

self.s.sendto(msg, ('192.168.1.255', self.PORT))

它停止工作，接收设备无法读取任何内容。

然后我用 tcpdump 工具确认接收设备确实正在通过指定端口接收发送的流，但脚本很难看到这一点。

Answer 1

事实证明这是一个网络错误，当我从网络中删除路由器并在其中一个设备上使用一个交换机和一个板载 DHCP 服务器创建一个较小的网络时，它成功地处理了连接

python udp广播发送但收不到

python udp broadcast sending but not receiving

python

sockets

opencv

udp

broadcast