用pyQt5写的一个简单的mqtt客户端demo

用pyQt5写的一个简单的mqtt客户端demo

软件包安装

1. pyQt5
2. paho-mqtt
3. json

使用方法

1. 确保配置好mqtt服务器，并连接网络。
2. 修改同级目录下setting.json文件中的服务器配置信息。

   {
       "broker":"129.211.xx.xxx",
       "port":1883,
       "client":"ternimal",
       "passwd":"Mjk2NTE3NDY5MTQ1OTg4OdawdawdaTg************AyNDA",
       "topic":"/python/mqtt"
   }
   

3. 然后即可运行客户端等待MQTT数据。

    python app.py
   

4. 用MQTT.fx发送话题，即可在客户端显示。
   
   

代码

import random
import time
import sys
import os

from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QLabel, QWidget, QHBoxLayout, QVBoxLayout, QTextEdit, QPushButton
from PyQt5.QtCore import pyqtSignal, QObject, Qt

from paho.mqtt import client as mqtt_client

import json

# 读取配置信息
with open("./setting.json", "r") as f:
    setting = json.load(f)
    broker = setting['broker']
    port = setting['port']
    username = setting['client']
    password = setting['passwd']
    topic = setting['topic']

# 随机生成Client ID
client_id = f'ternimal-mqtt-{random.randint(0, 100)}'


class MQTT(QObject):
    """MQTT通信"""

    signal = pyqtSignal(str, str)

    def __init__(self, parent=None):
        super().__init__(parent)

    def _connect_mqtt(self) -> mqtt_client:
        def on_connect(client, userdata, flags, rc):
            if rc == 0:
                print("Connected to MQTT Broker!")
            else:
                print("Failed to connect, return code %d\n", rc)

        client = mqtt_client.Client(client_id)
        client.username_pw_set(username=username, password=password)
        client.on_connect = on_connect
        client.connect(broker, port)
        return client

    def _subscribe(self, client: mqtt_client):
        def on_message(client, userdata, msg):
            print(f"Received `{msg.payload.decode()}` from `{msg.topic}` topic")
            self.signal.emit(msg.topic, msg.payload.decode())

        client.subscribe(topic)
        client.on_message = on_message

    def mqtt_run(self):

        client = self._connect_mqtt()
        self._subscribe(client)
        client.loop_start()  # 开启新线程处理MQTT数据


class Window(QWidget):
    """窗口界面"""

    def __init__(self, parent=None):
        super().__init__(parent)
        self._ui_init()

    def _ui_init(self):
        """绘制UI"""
        self.setWindowTitle("MQTT")
        self.setFixedWidth(900)
        self.setFixedHeight(450)

        self.topic_wgt = QTextEdit()
        self.data_wgt = QTextEdit()

        self.clear_btn = QPushButton("clear")

        layout_h1 = QHBoxLayout()
        layout_h2 = QHBoxLayout()
        layoutV = QVBoxLayout()
        layout_h1.addWidget(QLabel("Topic:"))
        layout_h1.addWidget(QLabel("Payload:"))
        layout_h2.addWidget(self.topic_wgt)
        layout_h2.addWidget(self.data_wgt)
        layoutV.addLayout(layout_h1)
        layoutV.addLayout(layout_h2)
        layoutV.addWidget(self.clear_btn)

        self.clear_btn.clicked.connect(self.clear_data)  # 连接槽函数
        self.setLayout(layoutV)

    def show_data(self, topic, payload):
        self.topic_wgt.append(topic)
        self.data_wgt.append(payload)
        pass

    def clear_data(self):
        self.topic_wgt.clear()
        self.data_wgt.clear()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    # 创建MQTT客户端
    client = MQTT()
    client.mqtt_run()
    # 显示界面
    Win = Window()
    Win.show()

    client.signal.connect(Win.show_data)  # 将MQTT数据接收信号和UI刷新槽关联
    sys.exit(app.exec())