Paho.mqtt.golang客户端连接示例

Search…

需注意收SetDefaultPublishHandler对应的Handler func不允许有业务代码阻塞，必须通过channel进行缓冲列表，否则会导致连接不稳定。

1
package main
2
​
3
import (
4
	"flag"
5
	"fmt"
6
	MQTT "github.com/eclipse/paho.mqtt.golang"
7
	"log"
8
	"os"
9
	"os/signal"
10
	"syscall"
11
	"time"
12
)
13
​
14
func main() {
15
	topic := flag.String("topic", "aaa/bbb", "The topic name to/from which to publish/subscribe")
16
	broker := flag.String("broker", "tcp://192.168.101.254:1883", "The broker URI. ex: tcp://10.10.1.1:1883")
17
	password := flag.String("password", "", "The password (optional)")
18
	user := flag.String("user", "", "The User (optional)")
19
	id := flag.String("id", "testgoid", "The ClientID (optional)")
20
	cleansess := flag.Bool("clean", false, "Set Clean Session (default false)")
21
	qos := flag.Int("qos", 0, "The Quality of Service 0,1,2 (default 0)")
22
	payload := flag.String("message", "", "The message text to publish (default empty)")
23
	store := flag.String("store", ":memory:", "The Store Directory (default use memory store)")
24
	flag.Parse()
25
​
26
	if *topic == "" {
27
		fmt.Println("Invalid setting for -topic, must not be empty")
28
		return
29
	}
30
​
31
	fmt.Printf("Sample Info:\n")
32
	fmt.Printf("\tbroker:    %s\n", *broker)
33
	fmt.Printf("\tclientid:  %s\n", *id)
34
	fmt.Printf("\tuser:      %s\n", *user)
35
	fmt.Printf("\tpassword:  %s\n", *password)
36
	fmt.Printf("\ttopic:     %s\n", *topic)
37
	fmt.Printf("\tmessage:   %s\n", *payload)
38
	fmt.Printf("\tqos:       %d\n", *qos)
39
	fmt.Printf("\tcleansess: %v\n", *cleansess)
40
	fmt.Printf("\tstore:     %s\n", *store)
41
​
42
	opts := MQTT.NewClientOptions()
43
	opts.AddBroker(*broker)
44
	opts.SetClientID(*id)
45
	opts.SetUsername(*user)
46
	opts.SetPassword(*password)
47
	opts.SetCleanSession(*cleansess)
48
	opts.SetKeepAlive(60)
49
	////自动重连机制，如网络不稳定可开启
50
	//opts.SetAutoReconnect(true)//启用自动重连功能
51
	//opts.SetMaxReconnectInterval(30)//每30秒尝试重连
52
	if *store != ":memory:" {
53
		opts.SetStore(MQTT.NewFileStore(*store))
54
	}
55
​
56
	quit := make(chan bool)
57
	choke := make(chan [2]string)
58
	opts.SetDefaultPublishHandler(func(client MQTT.Client, msg MQTT.Message) {
59
		choke <- [2]string{msg.Topic(), string(msg.Payload())}
60
	})
61
	go func() {
62
		for {
63
			select {
64
			case incoming := <-choke:
65
				fmt.Printf("RECEIVED TOPIC: %s MESSAGE: %s\n", incoming[0], incoming[1])
66
			case <-quit:
67
				return
68
			default:
69
​
70
			}
71
		}
72
	}()
73
​
74
	client := MQTT.NewClient(opts)
75
	if token := client.Connect(); token.Wait() && token.Error() != nil {
76
		panic(token.Error())
77
	}
78
​
79
	if token := client.Subscribe(*topic, byte(*qos), nil); token.Wait() && token.Error() != nil {
80
		fmt.Println(token.Error())
81
		os.Exit(1)
82
	}
83
​
84
	signalChan := make(chan os.Signal, 1)
85
	cleanupDone := make(chan bool)
86
	cleanup := make(chan bool)
87
	signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
88
	go func() {
89
		for range signalChan {
90
			quit <- true
91
			go func() {
92
				go func() {
93
					client.Disconnect(250)
94
				}()
95
				time.Sleep(260 * time.Millisecond)
96
				cleanup <- true
97
			}()
98
			<-cleanup
99
			log.Println("safe quit")
100
			cleanupDone <- true
101
		}
102
	}()
103
	<-cleanupDone
104
}
Copied!

COOLPY7领域应用 - Previous

使用MQTT.js库连接CP7

Next - MQTT协议基础知识

MQTT协议

Last modified 1yr ago

Copy link