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python-3.x - 如何在 python 上使用 PAHO-MQTT 订阅多个主题

转载 作者:行者123 更新时间:2023-12-03 01:28:37 49 4
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我正在尝试使用单个订阅者客户端订阅三个不同的主题。但通过下面提到的代码,我只能从一台服务器获取数据。请建议对我的代码进行 ant 修改,以便从不同的发布者客户端获取所需的数据。

# Define Variables
MQTT_BROKER = "10.97.143.44"
MQTT_PORT = 11883
MQTT_TOPIC = [("Server1/kpi1"),("Server2/kpi2"),("Server3/kpi3")


def on_connect(client, userdata, flags, rc):
if rc == 0:
print("Connected to broker")
global Connected #Use global variable
Connected = True #Signal connection
else:
print("Connection failed")

def on_message(client, userdata, message):
data = message.payload
receive=data.decode("utf-8")
m_decode = json.loads(receive)
#print(m_decode)
#print (m_decode['Server_name'])
print ("Message received: " + str(m_decode))


Connected = False #global variable for the state of the connection

client = mqttClient.Client("Python") #create new instance
client.on_connect= on_connect #attach function to callback
client.on_message= on_message #attach function to callback
client.connect(MQTT_BROKER,MQTT_PORT) #connect to broker



client.loop_start() #start the loop

while Connected != True: #Wait for connection

time.sleep(0.1)

client.subscribe(MQTT_TOPIC)

try:

while True:

time.sleep(1)

except KeyboardInterrupt:

print ("exiting")

List item

client.disconnect()

client.loop_stop()

最佳答案

您的 MQTT_TOPIC 数组应包含 QOS 级别以及主题名称。

来自doc :

String and integer tuple

e.g. subscribe(("my/topic", 1))

topic

a tuple of (topic, qos). Both topic and qos must be present in the tuple.

qos

not used.

例如

MQTT_TOPIC = [("服务器1/kpi1",0),("服务器2/kpi2",0),("服务器3/kpi3",0)]

关于python-3.x - 如何在 python 上使用 PAHO-MQTT 订阅多个主题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48942538/

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