在Django中写mqtt脚本并使用

 1 # __author: gy-chen
 2 # data: 2020/5/23
 3 # -*- coding: UTF-8 -*-
 4 
 5 
 6 # 为了能在外部脚本中调用Django ORM模型，必须配置脚本环境变量，将脚本注册到Django的环境变量中
 7 import os, sys
 8 import django
 9 # 第一个参数固定，第二个参数是工程名称.settings
10 os.environ.setdefault(‘DJANGO_SETTING_MODULE‘, ‘backend.settings‘)
11 django.setup()
12 
13 # 引入mqtt包
14 import paho.mqtt.client as mqtt
15 # 使用独立线程运行
16 from threading import Thread
17 # from app名 import models
18 from backend import models    # import models可以操作数据
19 
20 import time
21 import json
22 
23 
24 # 建立mqtt连接
25 def on_connect(client, userdata, flag, rc):
26     print("Connect with the result code " + str(rc))
27     client.subscribe(‘data/receive‘, qos=0)
28 
29 
30 # 接收、处理mqtt消息
31 def on_message(client, userdata, msg):
32     out = msg.payload.decode(‘utf-8‘)
33     # print("topic:"+msg.topic)
34     # print(out)  # string类型
35     # out = json.loads(out)
36 
37     # 收到消息后执行任务
38     if msg.topic == ‘data/receive‘:
39 
40         # 处理model层业务
41         # 增
42         # obj = models.MqttData(topic=msg.topic, msg=out)
43         # obj.save()
44         # print("==>" + out)
45         # 查
46         # data = models.MqttData.objects.all()
47         # print(data)
48         # 改
49         models.MqttData.objects.filter(topic=msg.topic).update(msg=out)
50 
51 
52 # mqtt客户端启动函数
53 def mqttfunction():
54     global client
55     # 使用loop_start 可以避免阻塞Django进程，使用loop_forever()可能会阻塞系统进程
56     # client.loop_start()
57     # client.loop_forever() 有掉线重连功能
58     client.loop_forever(retry_first_connection=True)
59 
60 
61 client = mqtt.Client(client_id="test", clean_session=False)
62 
63 
64 # 启动函数
65 def mqtt_run():
66     client.on_connect = on_connect
67     client.on_message = on_message
68     # 绑定 MQTT 服务器地址
69     broker = ‘120.79.57.0‘
70     # MQTT服务器的端口号
71     client.connect(broker, 1883, 4000)
72     client.username_pw_set(‘admin‘, ‘admin‘)
73     client.reconnect_delay_set(min_delay=1, max_delay=2000)
74     # 启动
75     mqttthread = Thread(target=mqttfunction)
76     mqttthread.start()
77 
78 
79 # 启动 MQTT
80 # mqtt_run()
81 
82 
83 if __name__ == "__main__":
84     mqtt_run()