//Node 1

func main() {

addr := net.UDPAddr{
    Port: 7000,
    IP:   net.ParseIP("127.0.0.1"),
}
conn, err := net.ListenUDP("udp", &addr)

defer conn.Close()
if err != nil {
    panic(err)
}
for {
       b := make([]byte, 10)
       conn.Read(b)
       fmt.Println(string(b[:])) // prints first send
       conn.Write([]byte("sending back")) // this packet never gets sent
    }
}

//Node 2

func main() {

sock, _ := net.Dial("udp", "127.0.0.1:7000")
buf := make([]byte, 10)

sock.Write([]byte("first send")) // this datagram gets sent
sock.Read(buf) // nothing is ever recieved
fmt.Println(string(buf[:]))