go run tcp_writer.go

$ go run src/github.com/ajackson/misc/tcp_writer.go 
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Wrote data successfully
Failed to write data write tcp 127.0.0.1:12345: broken pipe
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused
Failed to dial dial tcp 127.0.0.1:12345: connection refused

nc -l 12345

$ nc -l 12345
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
Some data for you
^C
$

tcp_writer.go

package main

import "net"

func main() {

	data := []byte("Some data for you\n")
	for {
		conn, err := net.Dial("tcp", "localhost:12345")
		if err != nil {
			println("Failed to dial", err.Error())
			continue
		}
		for {
			_, err = conn.Write(data)
			println("Wrote data successfully")
			if err != nil {
				println("Failed to write data", err.Error())
				break
			}
		}
	}
}