mqtt 服务器/客户端搭建实例

数据库 2020-04-20 10:22:56 阅读次数: 0

Mqtt最开始是为石油管道的监控而设计的一个协议，占用带宽小，低功耗。在iot领域有广泛应用。

  • 服务端用erlang编写的一个开源项目：emqqtd
  • 客户端用golang客户端的库：“github.com/eclipse/paho.mqtt.golang”

服务器端搭建：

下载预编译安装包：

root@ubuntu:/home/jack# wget https://github.com/emqx/emqx/releases/download/v4.0.4/emqx-ubuntu18.04-v4.0.4.zip
--2020-04-18 18:54:51--  https://github.com/emqx/emqx/releases/download/v4.0.4/emqx-ubuntu18.04-v4.0.4.zip
Resolving github.com (github.com)... 52.74.223.119
Connecting to github.com (github.com)|52.74.223.119|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/7202769/4b404580-5fa4-11ea-9fe4-73ad70b12bdc?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200419%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200419T015452Z&X-Amz-Expires=300&X-Amz-Signature=6f5336e167fccc50b81ab189f5e3f8edfd1ccf4daa862af3a5d564a4cc17893b&X-Amz-SignedHeaders=host&actor_id=0&repo_id=7202769&response-content-disposition=attachment%3B%20filename%3Demqx-ubuntu18.04-v4.0.4.zip&response-content-type=application%2Foctet-stream [following]
--2020-04-18 18:54:52--  https://github-production-release-asset-2e65be.s3.amazonaws.com/7202769/4b404580-5fa4-11ea-9fe4-73ad70b12bdc?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200419%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200419T015452Z&X-Amz-Expires=300&X-Amz-Signature=6f5336e167fccc50b81ab189f5e3f8edfd1ccf4daa862af3a5d564a4cc17893b&X-Amz-SignedHeaders=host&actor_id=0&repo_id=7202769&response-content-disposition=attachment%3B%20filename%3Demqx-ubuntu18.04-v4.0.4.zip&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 52.217.46.76
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|52.217.46.76|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 23267163 (22M) [application/octet-stream]
Saving to: ‘emqx-ubuntu18.04-v4.0.4.zip’

emqx-ubuntu18.04-v4.0.4.zip              100%[=================================================================================>]  22.19M  1.45MB/s    in 16s     

2020-04-18 18:55:10 (1.36 MB/s) - ‘emqx-ubuntu18.04-v4.0.4.zip’ saved [23267163/23267163]

root@ubuntu:/home/jack

解压，查看目录结构：

root@ubuntu:/home/jack# unzip emqx-ubuntu18.04-v4.0.4.zip
root@ubuntu:/home/jack/mqttd/emqx# tree -L 1
.
├── bin
├── data
├── erts-10.5.2
├── etc
├── lib
├── log
└── releases

7 directories, 0 files
root@ubuntu:/home/jack/mqttd/emqx#

启动服务器:

root@ubuntu:/home/jack/mqttd/emqx# ./bin/emqx start
EMQ X Broker v4.0.4 is started successfully!
root@ubuntu:/home/jack/mqttd/emqx#

查看状态：

root@ubuntu:/home/jack/mqttd/emqx# ./bin/emqx_ctl status
Node '[email protected]' is started
emqx 4.0.4 is running
root@ubuntu:/home/jack/mqttd/emqx#

停止服务器：

root@ubuntu:/home/jack/mqttd/emqx# ./bin/emqx stop
ok
root@ubuntu:/home/jack/mqttd/emqx#

mqtt服务器的ip查看：

root@ubuntu:/home/jack/mqttd/emqx# ifconfig 
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.243  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::20c:29ff:fef4:a0f6  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:f4:a0:f6  txqueuelen 1000  (Ethernet)
        RX packets 193799  bytes 60667948 (60.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 140410  bytes 12827731 (12.8 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1328  bytes 127242 (127.2 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1328  bytes 127242 (127.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@ubuntu:/home/jack/mqttd/emqx#

服务器启动后，可以通过dash board来监控mqtt broker的状态
在浏览器输入：http://192.168.1.243:18083/#/clients，用户名为：admin，密码为：public。如下图：
在这里插入图片描述
vscode IDE，git。
注意：依赖的net包容易下载失败：go get golang.org/x/net/proxy，用git从github下载后，将包拷贝到D:\GOPATH\src\golang.org\x\net目录即可

mqtt客户端实现：

package main

import (
	"fmt"
	"log"
	"os"
	"time"

	mqtt "github.com/eclipse/paho.mqtt.golang"
)

//创建全局mqtt publish消息处理 handler
var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
	fmt.Println("发布消息：")
	fmt.Printf("TOPIC: %s\n", msg.Topic())
	fmt.Printf("MSG: %s\n", msg.Payload())
}

//创建全局mqtt sub消息处理 handler
var messageSubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
	fmt.Println("收到订阅消息：")
	fmt.Printf("Sub Client Topic : %s \n", msg.Topic())
	fmt.Printf("Sub Client msg : %s \n", msg.Payload())
}

func main() {
	mqtt.DEBUG = log.New(os.Stdout, "", 0)
	mqtt.ERROR = log.New(os.Stdout, "", 0)
	//opts := mqtt.NewClientOptions().AddBroker("tcp://broker.emqx.io:1883").SetClientID("emqx_test_client")

	// 创建消息发布go程
	go func() {
		opts := mqtt.NewClientOptions().AddBroker("tcp://192.168.1.243:1883").SetClientID("emqx_test_client66666")
		opts.SetKeepAlive(60 * time.Second)
		// Message callback handler，在没有任何订阅时，发布端调用此函数
		opts.SetDefaultPublishHandler(messagePubHandler)
		opts.SetPingTimeout(1 * time.Second)

		client := mqtt.NewClient(opts)
		if token := client.Connect(); token.Wait() && token.Error() != nil {
			panic(token.Error())
		}

		for i := 0; i < 6; i++ {
			time.Sleep(1 * time.Second)
			fmt.Println("发布一条天气预报消息")
			token := client.Publish("testtopic/1", 0, false, "Hello World，深圳天气晴朗")
			token.Wait()
		}

		fmt.Println("发布客户端断开与broker的连接")
		client.Disconnect(250)
	}()

	// 创建消息订阅go程
	go func() {
		opts := mqtt.NewClientOptions().AddBroker("tcp://192.168.1.243:1883").SetClientID("emqx_test_client99999")
		opts.SetKeepAlive(60 * time.Second)
		opts.SetPingTimeout(1 * time.Second)

		client := mqtt.NewClient(opts)
		if token := client.Connect(); token.Wait() && token.Error() != nil {
			panic(token.Error())
		}

		// Subscription
		/*if token := client.Subscribe("testtopic/#", 0, messageSubHandler); token.Wait() && token.Error() != nil {
			fmt.Println(token.Error())
			os.Exit(1)
		}*/
		for i := 0; i < 6; i++ {
			time.Sleep(time.Duration(3) * time.Second)
			//发布消息
			if token := client.Subscribe("testtopic/#", 1, messageSubHandler); token.Wait() && token.Error() != nil {
				fmt.Println(token.Error())
				os.Exit(1)
			}
		}

		// Cancel subscription
		if token := client.Unsubscribe("testtopic/#"); token.Wait() && token.Error() != nil {
			fmt.Println(token.Error())
			os.Exit(1)
		}

		fmt.Println("订阅客户端断开与broker的连接")
		//c.Disconnect(250)
	}()

	// Disconnect
	time.Sleep(10 * time.Second)
}

按F5，执行效果：

API server listening at: 127.0.0.1:34378
[client]   Connect()
[client]   Connect()
[store]    memorystore initialized
[store]    memorystore initialized
[client]   about to write new connect msg
[client]   about to write new connect msg
[client]   socket connected to broker
[client]   Using MQTT 3.1.1 protocol
[client]   socket connected to broker
[client]   Using MQTT 3.1.1 protocol
[net]      connect started
[net]      connect started
[net]      received connack
[client]   client is connected
[client]   exit startClient
[pinger]   keepalive starting
[net]      logic started
[net]      logic waiting for msg on ibound
[net]      outgoing started
[net]      outgoing waiting for an outbound message
[net]      incoming started
[net]      received connack
[pinger]   keepalive starting
[client]   client is connected
[client]   exit startClient
[net]      logic started
[net]      logic waiting for msg on ibound
[net]      outgoing started
[net]      outgoing waiting for an outbound message
[net]      incoming started
发布一条天气预报消息
[client]   enter Publish
[client]   sending publish message, topic: testtopic/1
[net]      obound wrote msg, id: 0
[net]      outgoing waiting for an outbound message
发布一条天气预报消息
[client]   enter Publish
[client]   sending publish message, topic: testtopic/1
[net]      obound wrote msg, id: 0
[net]      outgoing waiting for an outbound message
[client]   enter Subscribe
[client]   SUBSCRIBE: dup: false qos: 1 retain: false rLength: 0 MessageID: 1 topics: [testtopic/#]
[client]   sending subscribe message, topic: testtopic/#
[client]   exit Subscribe
[net]      obound priority msg to write, type *packets.SubscribePacket
[net]      outgoing waiting for an outbound message
[net]      Received Message
[net]      logic got msg on ibound
[store]    memorystore del: message 1 was deleted
[net]      received suback, id: 1
[net]      granted qoss [1]
[net]      logic waiting for msg on ibound
发布一条天气预报消息
[client]   enter Publish
[client]   sending publish message, topic: testtopic/1
[net]      obound wrote msg, id: 0
[net]      outgoing waiting for an outbound message
[net]      Received Message
[net]      logic got msg on ibound
[net]      received publish, msgId: 0
[net]      putting msg on onPubChan
[net]      done putting msg on incomingPubChan
[net]      logic waiting for msg on ibound
收到订阅消息：
Sub Client Topic : testtopic/1 
Sub Client msg : Hello World，深圳天气晴朗2
发布一条天气预报消息
[client]   enter Publish
[client]   sending publish message, topic: testtopic/1
[net]      obound wrote msg, id: 0
[net]      outgoing waiting for an outbound message
[net]      Received Message
[net]      logic got msg on ibound
[net]      received publish, msgId: 0
[net]      putting msg on onPubChan
[net]      done putting msg on incomingPubChan
[net]      logic waiting for msg on ibound
收到订阅消息：
Sub Client Topic : testtopic/1 
Sub Client msg : Hello World，深圳天气晴朗3
[pinger]   ping check 1.9993801
[pinger]   ping check 0.9978095
发布一条天气预报消息
[client]   enter Publish
[client]   sending publish message, topic: testtopic/1
[net]      obound wrote msg, id: 0
[net]      outgoing waiting for an outbound message
[net]      Received Message
[net]      logic got msg on ibound
[net]      received publish, msgId: 0
[net]      putting msg on onPubChan
[net]      done putting msg on incomingPubChan
[net]      logic waiting for msg on ibound
收到订阅消息：
Sub Client Topic : testtopic/1 
Sub Client msg : Hello World，深圳天气晴朗4
[client]   enter Subscribe
[client]   SUBSCRIBE: dup: false qos: 1 retain: false rLength: 0 MessageID: 1 topics: [testtopic/#]
[client]   sending subscribe message, topic: testtopic/#
[client]   exit Subscribe
[net]      obound priority msg to write, type *packets.SubscribePacket
[net]      outgoing waiting for an outbound message
[net]      Received Message
[net]      logic got msg on ibound
[store]    memorystore del: message 1 was deleted
[net]      received suback, id: 1
[net]      granted qoss [1]
[net]      logic waiting for msg on ibound
发布一条天气预报消息
[client]   enter Publish
[client]   sending publish message, topic: testtopic/1
[net]      obound wrote msg, id: 0
[net]      outgoing waiting for an outbound message
发布客户端断开与broker的连接
[client]   disconnecting
[net]      obound priority msg to write, type *packets.DisconnectPacket
[net]      outbound wrote disconnect, stopping
[pinger]   keepalive stopped
[net]      incoming stopped
[msgids]   cleaned up
[client]   disconnected
[store]    memorystore closed
[net]      Received Message
[net]      logic got msg on ibound
[net]      received publish, msgId: 0
[net]      putting msg on onPubChan
[net]      done putting msg on incomingPubChan
[net]      logic waiting for msg on ibound
收到订阅消息：
Sub Client Topic : testtopic/1 
Sub Client msg : Hello World，深圳天气晴朗5
[client]   enter Subscribe
[client]   SUBSCRIBE: dup: false qos: 1 retain: false rLength: 0 MessageID: 1 topics: [testtopic/#]
[client]   sending subscribe message, topic: testtopic/#
[client]   exit Subscribe
[net]      obound priority msg to write, type *packets.SubscribePacket
[net]      outgoing waiting for an outbound message
[net]      Received Message
[net]      logic got msg on ibound
[store]    memorystore del: message 1 was deleted
[net]      received suback, id: 1
[net]      granted qoss [1]
[net]      logic waiting for msg on ibound
Process exiting with code: 0
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