added simple client/server

cmd/rrecv/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"os"
+
+	"mcquay.me/robo"
+)
+
+func main() {
+	ln, err := net.Listen("tcp", fmt.Sprintf(":%d", robo.Port))
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+
+	}
+
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%v\n", err)
+			os.Exit(1)
+		}
+
+		s := bufio.NewScanner(conn)
+		for s.Scan() {
+			txt := s.Text()
+			fmt.Printf("sending: %s\n", txt)
+			_, err := conn.Write([]byte(txt + "\n"))
+			if err != nil {
+				break
+			}
+		}
+		if err := s.Err(); err != nil {
+			fmt.Fprintf(os.Stderr, "%v\n", err)
+			os.Exit(1)
+		}
+
+		fmt.Printf("disconnect: %+v\n", conn)
+	}
+}