implement pubsub command.

main.go

@@ -107,6 +107,51 @@ func subscribe(c *cli.Context) {
 	}
 }
 
+func pubsub(c *cli.Context) {
+	if c.Bool("d") {
+		log.SetLevel(log.DebugLevel)
+	}
+	opts := NewOption(c)
+	client, err := connect(c, opts)
+	if err != nil {
+		log.Error(err)
+		os.Exit(1)
+	}
+
+	qos := c.Int("q")
+	subtopic := c.String("sub")
+	if subtopic == "" {
+		log.Errorf("Please specify sub topic")
+		os.Exit(1)
+	}
+	log.Infof("Sub Topic: %s", subtopic)
+	pubtopic := c.String("pub")
+	if pubtopic == "" {
+		log.Errorf("Please specify pub topic")
+		os.Exit(1)
+	}
+	log.Infof("Pub Topic: %s", pubtopic)
+	retain := c.Bool("r")
+
+	go func() {
+		// Read from Stdin
+		scanner := bufio.NewScanner(os.Stdin)
+		for scanner.Scan() {
+			err = client.Publish(pubtopic, []byte(scanner.Text()), qos, retain)
+			if err != nil {
+				log.Error(err)
+			}
+
+		}
+	}()
+
+	err = client.Subscribe(subtopic, qos)
+	if err != nil {
+		log.Error(err)
+	}
+
+}
+
 func main() {
 	initFunc()
 
@@ -168,6 +213,16 @@ func main() {
 		},
 	)
 	subFlags := commonFlags
+	pubsubFlags := append(commonFlags,
+		cli.StringFlag{
+			Name:  "pub",
+			Usage: "publish topic",
+		},
+		cli.StringFlag{
+			Name:  "sub",
+			Usage: "subscribe topic",
+		},
+	)
 
 	app.Commands = []cli.Command{
 		{
@@ -182,6 +237,12 @@ func main() {
 			Flags:  subFlags,
 			Action: subscribe,
 		},
+		{
+			Name:   "pubsub",
+			Usage:  "subscribe and publish",
+			Flags:  pubsubFlags,
+			Action: pubsub,
+		},
 	}
 	app.Run(os.Args)
 }

mqtt.go

@@ -42,8 +42,9 @@ func (m *MQTTClient) Publish(topic string, payload []byte, qos int, retain bool)
 }
 
 func onMessageReceived(client *MQTT.MqttClient, message MQTT.Message) {
-	fmt.Print(string(message.Payload()))
+	fmt.Println(string(message.Payload()))
 }
+
 func (m *MQTTClient) Subscribe(topic string, qos int) error {
 	topicFilter, err := MQTT.NewTopicFilter(topic, byte(qos))
 	if err != nil {