[英]How to filter messages from MQTT topic?
我的問題是這個。 我想提取發送到我訂閱的頻道的消息,並相應地向系統添加功能。 這是我在代碼中想要的算法:
我使用 Qt5 作為 UI。 我可以發布特定主題的消息。 我的 MQTT 服務器和客戶端運行正常。 這是我的代碼:
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.Qt import *
from PyQt5.QtWebEngineWidgets import *
from PyQt5.QtWidgets import QApplication
import sys
import paho.mqtt.client as mqtt
def on_connect(client, userdata, flags, rc):
if rc == 0:
print("Connected successfully")
else:
print("Connect returned result code: " + str(rc))
# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
print("Received message: " + msg.topic + " -> " + msg.payload.decode("utf-8"))
class mqttbrokerconnection:
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.tls_set(tls_version=mqtt.ssl.PROTOCOL_TLS)
client.username_pw_set("usrnm", "pwd")
client.connect("server", port)
client.subscribe("deneme")
client.publish("deneme", "selam dünya!")
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("deneme")#pencere ismi
MainWindow.resize(1280, 960)#pencere boyutu
MainWindow.setStyleSheet("background-color: rgb(100, 100, 100);")#renk
self.centralwidget = QtWidgets.QWidget(MainWindow)#bu ne amk
self.centralwidget.setObjectName("centralwidget")#bunu da bilmiom
self.widget = QWebEngineView(self.centralwidget)#Webviev şeysi
self.widget.setGeometry(QtCore.QRect(320, 100, 640, 460))#Webviev boyutu
self.widget.setObjectName("widget")#Webview ismi
self.ileri = QtWidgets.QPushButton(self.centralwidget)
self.ileri.setGeometry(QtCore.QRect(600, 710, 71, 61))
self.ileri.setObjectName("ileri")
self.ileri.setStyleSheet("color: rgb(255, 255, 255);")
self.geri = QtWidgets.QPushButton(self.centralwidget)
self.geri.setGeometry(QtCore.QRect(600, 770, 71, 61))
self.geri.setObjectName("geri")
self.geri.setStyleSheet("color: rgb(255, 255, 255);")
self.sol = QtWidgets.QPushButton(self.centralwidget)
self.sol.setGeometry(QtCore.QRect(529, 770, 71, 61))
self.sol.setObjectName("sol")
self.sol.setStyleSheet("color: rgb(255, 255, 255);")
self.sag = QtWidgets.QPushButton(self.centralwidget)
self.sag.setGeometry(QtCore.QRect(671, 770, 71, 61))
self.sag.setObjectName("sag")
self.sag.setStyleSheet("color: rgb(255, 255, 255);")
MainWindow.setCentralWidget(self.centralwidget)#bunuda bilmiom mk
self.menubar = QtWidgets.QMenuBar(MainWindow)#sanırım menü barı
self.widget.load(QUrl("http://google.com"))#webviev yüklenecek url
self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 21))#menübar konum şeysi
self.menubar.setObjectName("menubar")#menübar isim
MainWindow.setMenuBar(self.menubar)#mainwindows'daki menübarın menübar olduğunu tanımlama
self.statusbar = QtWidgets.QStatusBar(MainWindow)#idfc
self.statusbar.setObjectName("statusbar")#idfc
MainWindow.setStatusBar(self.statusbar)#mainwindowdaki idfcin idfc olduğunu tanımlama
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):#çeviri kısm
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "skrt app"))
self.ileri.setText(_translate("MainWindow", "↑↑"))
self.geri.setText(_translate("MainWindow", "↓↓"))
self.sol.setText(_translate("MainWindow", "←←"))
self.sag.setText(_translate("MainWindow", "→→"))
if __name__ == "__main__":#uygulama çekirdeği
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
client.loop_forever()
正如@chrislondon 所提到的,您可以有子主題:例如your_topic/msg1
和your_topic/msg2
。 然后發布到這些主題。 使用client.message_callback_add("your_topic/msg1", on_message_msg1)
和client.message_callback_add("your_topic/msg2", on_message_msg2)
訂閱它們,並在msg1
或msg2
到達訂閱者的情況下執行您的自定義邏輯 - 在on_message_msg1()
和on_message_msg2()
回調。
請看一下這個例子: https : //github.com/eclipse/paho.mqtt.python/blob/master/examples/client_sub-multiple-callback.py
還有更多使用 Paho MQTT 的例子: https : //github.com/eclipse/paho.mqtt.python/tree/master/examples
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