├── LICENSE
├── README.md
└── gochat-mqtt.go


/LICENSE:
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 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2014 Al S-M
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy of
 6 | this software and associated documentation files (the "Software"), to deal in
 7 | the Software without restriction, including without limitation the rights to
 8 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 9 | the Software, and to permit persons to whom the Software is furnished to do so,
10 | subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
17 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
18 | COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 | 


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/README.md:
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 1 | gochat-mqtt
 2 | ===========
 3 | 
 4 | A simple chat program to demonstrate [MQTT](http://mqtt.org) with Go, using the [Eclipse Paho](http://eclipse.org/paho) Go client
 5 | 
 6 | **Build**
 7 | 
 8 | Requires Go, obviously...
 9 | 
10 | Set the `GOPATH` and `GOBIN` variables appropriately, then...
11 | 
12 | ```
13 | $ go get git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git
14 | $ go install gochat-mqtt.go
15 | ```
16 | 
17 | **Run**
18 | 
19 | ```
20 | $ gochat-mqtt --help
21 | Usage of gochat-mqtt:
22 |   -name="user201": Username to be displayed
23 |   -room="gochat": The chat room to enter. default 'gochat'
24 |   -server="tcp://iot.eclipse.org:1883": The MQTT server to connect to
25 | ```
26 | 


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/gochat-mqtt.go:
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 1 | package main
 2 | 
 3 | import (
 4 | 	"bufio"
 5 | 	"flag"
 6 | 	"fmt"
 7 | 	MQTT "git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git"
 8 | 	"io"
 9 | 	"math/rand"
10 | 	"os"
11 | 	"strconv"
12 | 	"strings"
13 | 	"time"
14 | )
15 | 
16 | func messageReceived(client *MQTT.Client, msg MQTT.Message) {
17 | 	topics := strings.Split(msg.Topic(), "/")
18 | 	msgFrom := topics[len(topics)-1]
19 | 	fmt.Print(msgFrom + ": " + string(msg.Payload()))
20 | }
21 | 
22 | func main() {
23 | 	stdin := bufio.NewReader(os.Stdin)
24 | 	rand.Seed(time.Now().Unix())
25 | 
26 | 	server := flag.String("server", "tcp://iot.eclipse.org:1883", "The MQTT server to connect to")
27 | 	room := flag.String("room", "gochat", "The chat room to enter. default 'gochat'")
28 | 	name := flag.String("name", "user"+strconv.Itoa(rand.Intn(1000)), "Username to be displayed")
29 | 	flag.Parse()
30 | 
31 | 	subTopic := strings.Join([]string{"/gochat/", *room, "/+"}, "")
32 | 	pubTopic := strings.Join([]string{"/gochat/", *room, "/", *name}, "")
33 | 
34 | 	opts := MQTT.NewClientOptions().AddBroker(*server).SetClientID(*name).SetCleanSession(true)
35 | 
36 | 	opts.OnConnect = func(c *MQTT.Client) {
37 | 		if token := c.Subscribe(subTopic, 1, messageReceived); token.Wait() && token.Error() != nil {
38 | 			panic(token.Error())
39 | 		}
40 | 	}
41 | 
42 | 	client := MQTT.NewClient(opts)
43 | 
44 | 	if token := client.Connect(); token.Wait() && token.Error() != nil {
45 | 		panic(token.Error())
46 | 	}
47 | 	fmt.Printf("Connected as %s to %s\n", *name, *server)
48 | 
49 | 	for {
50 | 		message, err := stdin.ReadString('\n')
51 | 		if err == io.EOF {
52 | 			os.Exit(0)
53 | 		}
54 | 		if token := client.Publish(pubTopic, 1, false, message); token.Wait() && token.Error() != nil {
55 | 			fmt.Println("Failed to send message")
56 | 		}
57 | 	}
58 | }
59 | 


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