Help with udp communication

[hdayi (Hacı Dayı)]

Hi there,
I am trying to connect a device using UDP. Document of the device says, I must send a broadcast command using UDP port 4113 and must listen to replay on UDP port 4114.

When I test my code usin Linux nc command I get this error message:

invalid connection to [192.168.0.145] from (UNKNOWN) [192.168.0.100] 4114

My code:

	command := []byte("%US1975**\r\n")
	///
	//
	//
	listenAddr, err := net.ResolveUDPAddr("udp4", "192.168.0.100:4114")
	if err != nil {
		return err
	}
	list, err := net.ListenUDP("udp4", listenAddr)
	if err != nil {
		return err
	}
	defer list.Close()

	addr, err := net.ResolveUDPAddr("udp4", "192.168.0.255:4113")
	if err != nil {
		return err
	}

	_, err = list.WriteTo(command, addr)
	if err != nil {
		return err
	}

	reply := make([]byte, 236)
	_, addrDevice, err := list.ReadFromUDP(reply)
	if err != nil {
		return err
	}
	fmt.Print("Device IP: ")
	fmt.Println(addrDevice.IP.String())
	fmt.Println("===================================================================")
	fmt.Println(string(reply))
	fmt.Println("===================================================================")