基於Python 語言的Eclipse paho mqtt 示例

開發環境Pycharm + paho-mqq包。
本示例的mqtt 是阻塞式的。

# encoding=utf8
import paho.mqtt.client as mqtt
import paho.mqtt.publish as publish
import json

# 參考：
# Eclipse Paho - MQTT and MQTT-SN software
# https://www.eclipse.org/paho/clients/python/
# python paho-MQTT_qq_38059635的博客-CSDN博客_python paho mqtt
# https://blog.csdn.net/qq_38059635/article/details/88583800

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("suanfa/#")


# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))
    print(str(msg.topic))
    s = json.loads(msg.payload)
    print("type:" + s["type"])
    client.publish("test","hello")

def on_message_msgs(mosq, obj, msg):
    # This callback will only be called for messages with topics that match
    # $SYS/broker/messages/#
    print("MESSAGES: " + msg.topic + " " + str(msg.qos) + " " + str(msg.payload))

client = mqtt.Client("pythonclient")
client.message_callback_add('suanfa/a', on_message_msgs)
client.on_connect = on_connect
client.on_message = on_message


# client.connect("mqtt.eclipse.org", 1883, 60)
client.connect("xxx.216.xx.138", 1883, 60)# 換成自己的IP


# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()