Python簡單試用MQTT服務器

前言

經歷過各種問題的磨難終於基本搭建完成了自己的MQTT服務器,接下來我就趕緊寫個Python程序測試下.

安裝

這裏採用paho.mqtt.python編寫程序,詳情參閱這裏
打開powershell,執行pip install paho-mqtt安裝模塊

程序

# coding=utf-8
import json
import threading

import paho.mqtt.client as mqtt

# 當連接上服務器後回調此函數
import time

from my_lib.code_handle.code_handle import auto_code
from windows_info.read_info import Win_psutil


class MqttClient:
    client = mqtt.Client('tester')

    def __init__(self, host, port):
        self._host = host
        self._port = port
        self.client.on_connect = self._on_connect  # 設置連接上服務器回調函數
        self.client.on_message = self._on_message  # 設置接收到服務器消息回調函數

    def connect(self, username='tester', password='tester'):
        self.client.username_pw_set(username, password)
        self.client.connect(self._host, self._port, 60)  # 連接服務器,端口爲1883,維持心跳爲60秒

    def publish(self, topic, data):
        self.client.publish(topic, data)

    def loop(self, timeout=None):
        thread = threading.Thread(target=self._loop, args=(timeout,))
        # thread.setDaemon(True)
        thread.start()

    def _loop(self, timeout=None):
        if not timeout:
            self.client.loop_forever()
        else:
            self.client.loop(timeout)

    def _on_connect(self, client, userdata, flags, rc):
        print("\nConnected with result code " + str(rc))
        client.subscribe("test-0")

    def _on_message(self, client, userdata, msg):  # 從服務器接受到消息後回調此函數
        print "\n主題:" + auto_code(str(msg.topic)) + " 消息:" + auto_code(str(msg.payload))

    def _is_json(self, data):
        try:
            json.loads(data)
        except ValueError:
            return False
        return True

    def publish_loop(self):
        pass


if __name__ == '__main__':
	host=None
    client = MqttClient(host, 1883)
    client.connect('tester','tester')
    client.publish('test-0', '我上線啦!')
	client.loop()
    wp = Win_psutil()#自己定義的一個類
    while True:
        data_json=wp.auto_json()#方法返回一個包含CPU和進程信息的JSON字符串
        client.publish('test-0',data_json)
        time.sleep(2)

這裏自己封裝了類,主要功能是連上服務器訂閱默認主題,接收到消息即打印出來.
在主程序中先實例化類,接着使用默認用戶名與密碼登陸,在主題"test-0上"發佈信息,接着定時將打包成JSON信息的數據發佈到"test-0"這個主題