MQTT Paho Python 客户端订阅者，如何永远订阅？

Question

尝试在不断开与 Mosquitto 代理的连接的情况下进行简单订阅，以获取来自在特定主题中发布数据的设备的所有消息，将它们保存在 BD 中并 Post 它们到 php做 "staff".

这是我的subscribe.py

import paho.mqtt.client as mqtt
from mqtt_myapp import *

topic="topic/#"                 # MQTT broker topic
myclient="my-paho-client"           # MQTT broker My Client
user="user"                     # MQTT broker user
pw="pass"                       # MQTT broker password
host="localhost"                # MQTT broker host
port=1883                       # MQTT broker port
value="123"                     # somethin i need for myapp

def on_connect(mqttc, userdata, rc):
    print('connected...rc=' + str(rc))
    mqttc.subscribe(topic, qos=0)

def on_disconnect(mqttc, userdata, rc):
    print('disconnected...rc=' + str(rc))

def on_message(mqttc, userdata, msg):
    print('message received...')
    print('topic: ' + msg.topic + ', qos: ' + 
          str(msg.qos) + ', message: ' + str(msg.payload))
    save_to_db(msg)
    post_data(msg.payload,value)

def on_subscribe(mqttc, userdata, mid, granted_qos):
    print('subscribed (qos=' + str(granted_qos) + ')')

def on_unsubscribe(mqttc, userdata, mid, granted_qos):
    print('unsubscribed (qos=' + str(granted_qos) + ')')

mqttc = mqtt.Client(myclient)
mqttc.on_connect = on_connect
mqttc.on_disconnect = on_disconnect
mqttc.on_message = on_message
mqttc.on_subscribe = on_subscribe
mqttc.on_unsubscribe = on_unsubscribe
mqttc.username_pw_set(user,pw)
mqttc.connect(host, port, 60)
mqttc.loop_forever()

这是我的 mqtt_myapp.py:

import MySQLdb
import requests # pip install requests

url = "mydomain/data_from_broker.php"

def save_to_db(msg):
    with db:
        cursor = db.cursor()
        try:
            cursor.execute("INSERT INTO MQTT_LOGS (topic, payload) VALUES (%s,%s)", (msg.topic, msg.payload))
        except (MySQLdb.Error, MySQLdb.Warning) as e:
            print('excepttion BD ' + e)
            return None

def post_data(payload,value):
    datos = {'VALUE': value,'data-from-broker': payload}
    r = requests.post(url, datos)
    r.status_code
    print('response POST' + str(r.status_code))

db = MySQLdb.connect("localhost","user_db","pass_db","db" )

当我运行我的 python 脚本在后台使用 python -t mqtt_subscribe.py & 时，我收到了为其他客户端发布的消息，但是 在我的 subscribe.py 脚本运行ning，发生套接字错误。

Mosquito.log:

 ...
    1475614815: Received PINGREQ from my-paho-client
    1475614815: Sending PINGRESP to my-paho-client
    1475614872: New connection from xxx.xxx.xxx.xxx on port 1883.
    1475614872: Client device1 disconnected.
    1475614872: New client connected from xxx.xxx.xxx.xxx as device1(c0, k0, u'user1').
    1475614872: Sending CONNACK to device1(0, 0)
    1475614873: Received PUBLISH from device1(d0, q1, r0, m1, 'topic/data', ... (33 bytes))
    1475614873: Sending PUBACK to device1 (Mid: 1)
    1475614873: Sending PUBLISH to my-paho-client (d0, q0, r0, m0, 'topic/data', ... (33 bytes))
    1475614874: Received DISCONNECT from device1
    1475614874: Client device1 disconnected.
...
    1475625566: Received PINGREQ from my-paho-client
    1475625566: Sending PINGRESP to my-paho-client
    1475625626: Received PINGREQ from my-paho-client
    1475625626: Sending PINGRESP to my-paho-client
    1475625675: New connection from xxx.xxx.xxx.xxx on port 1883.
    1475625675: Client device1 disconnected.
    1475625675: New client connected from xxx.xxx.xxx.xxx as device1 (c0, k0, u'user1').
    1475625675: Sending CONNACK to device1 (0, 0)
    1475625677: Received PUBLISH from device1 (d0, q1, r0, m1, 'topic/data', ... (33 bytes))
    1475625677: Sending PUBACK to device1 (Mid: 1)
    1475625677: Sending PUBLISH to my-paho-client (d0, q0, r0, m0, 'topic/data', ... (33 bytes))
    1475625677: Socket error on client my-paho-client, disconnecting.
    1475625677: Received DISCONNECT from device1
...

可能是什么问题？有什么想法或建议吗？

提前致谢

Answer 1

如果您在方法 "on_message" 中的代码抛出异常而您没有捕获它，您将断开连接。尝试取消注释除 print 语句之外的所有语句。可能以下语句之一抛出异常。

 save_to_db(msg)
 post_data(msg.payload,value)

Answer 2

插入数据库时，使用 ? 而不是 %s。 link for reference

cursor.execute('''INSERT INTO users(name, phone, email, password)
                  VALUES(?,?,?,?)''', (name1,phone1, email1, password1))

MQTT Paho Python 客户端订阅者，如何永远订阅？

MQTT Paho Python Client subscriber, how subscribe forever?

python

mqtt

mosquitto

paho