UDP发送广播包失败 HarmonyOS 鸿蒙Next

UDP发送广播包失败 HarmonyOS 鸿蒙Next

UDP发送广播包一直失败，不知道为什么，有没有udp发送广播包的完整的demo案例，看文档是写了TCP的

let udp: socket.UDPSocket = socket.constructUDPSocketInstance()

udp.bind({

  address: '192.168.124.85',
  port: 4123
}, err => {
  if (err) {
    console.log('bind fail');
    return;
  }
  console.log('bind success');
  let buffer = new ArrayBuffer(0)
  udp.send({
    data: '1',
    address: {
      address: '255.255.255.255',
      port: 7683
    }
  }, err => {
    if (err) {
      console.log('send fail');
      return;
    }
    console.log('send success');
  });
});