按钮触发这段代码

UDPSocket.send() 报错 onError: send: fail sendUDPSocketMessage:fail function cannot run on service

同时UDPSocket.bind()没有返回port

    const udpClient = wx.createUDPSocket();
    const udpPort = udpClient.bind();
    console.log("udp client port: " + udpPort);  // 这里输出是： undefined
    udpClient.onListening((res) => {
      console.log("onListening: ")
      console.log(res)
    });
    udpClient.send({
      address: '255.255.255.255',
      port: 8266,
      message: data
    });
    udpClient.onError((err) => {
      console.log("onError: ")
      console.log(err)   // send: fail sendUDPSocketMessage:fail function cannot run on service
    });
    udpClient.onMessage((res) => {
      console.log("onMessage: ")
      console.log(res)
      udpClient.close()
    });