python - 如何在同一个 paho-mqtt 脚本下运行多个设备

Question

我正在编写一个脚本，该脚本将使用 paho-mqtt 记录具有不同凭据的多个设备。所有客户端都在相同的地址和相同的端口上运行。如果我更改用户名并通过，那么我会根据凭据获得不同的提要。如果我为不同的设备编写不同的脚本，它工作正常。但我想在 on_connet 中记录所有设备。我已经编写了脚本，但它仅适用于一台设备。这是脚本:

import paho.mqtt.client as mqtt
import time, json, threading, logging,ssl 

clients=[
   {"ursername":"username1","password": 'password1'},
   {"ursername":"username2","password":'password2'},
   {"ursername":"username3","password":'password3'}
]
nclients=len(clients)
run = True

def Create_connections():
   for i in range(nclients):
      t=int(time.time())
      client_id = "client" + str(t)
      client = mqtt.Client(client_id)
      
      username = credentials[i]["ursername"]
      password = credentials[i]["password"]
      
      client.on_log=on_log
      client.on_connect = on_connect
      client.on_subscribe=on_subscribe
      client.on_message = on_message
      client.on_disconnect = on_disconnect
      print("connecting to broker")
      
      client.tls_set("CXXXXX.crt", tls_version=ssl.PROTOCOL_TLSv1_2)
      client.tls_insecure_set(True)
      client.username_pw_set(username, password)
      client.loop_start()
      client.connect("XXXXX", XXXX, XX)
      print("Loop pass ")


def on_log(client, userdata, level, buf):
   print("message:" + str(buf))
   print("userdata:" + str(userdata))

   
def on_message(client, userdata, message):
   msg="message received",str(message.payload.decode("utf-8"))
   print(msg)

def on_connect(client, userdata, flags, rc):
   print("Connected with result code:"+str(rc))
   client.subscribe('v3/+/devices/+/up')


def on_disconnect(client, userdata, rc):
   pass

def on_publish(client, userdata, mid):
   print("mid: " + str(mid) + '\n')

def on_subscribe(mosq, obj, mid, granted_qos):
    print("Subscribed: " + str(mid) + " " + str(granted_qos))

mqtt.Client.connected_flag=False
no_threads=threading.active_count()
print("current threads =",no_threads)
print("Creating  Connections ",nclients," clients")

   
Create_connections()

回复

current threads = 1
Creating  Connections  2  clients
____________________________________________________________________________
client01597648398
<paho.mqtt.client.Client object at 0x7f73c0a5b1d0>
username1
connecting to broker
message:Sending CONNECT (u1, p1, wr0, wq0, wf0, c1, k60) client_id=b'client01597648398'
userdata:None
message:Received CONNACK (0, 0)
userdata:None
Connected with result code:0
message:Sending SUBSCRIBE (d0, m1) [(b'XX/+/devices/+/XX', 0)]
userdata:None
message:Received SUBACK
userdata:None
Subscribed: 1 (0,)
message:Sending PINGREQ
userdata:None
message:Received PINGRESP
userdata:None

任何帮助将不胜感激。提前致谢

Answer 1

你的问题在这里:

while run:
    client.loop_forever()

loop_forever()是一个阻塞调用，它只会在关联的客户端断开连接时返回:

This is a blocking form of the network loop and will not return until the client calls disconnect(). It automatically handles reconnecting. paho-mqtt

所以你的其他客户端永远不会被初始化/连接。您可能想使用 loop_start相反 - 这将使用一个单独的线程来处理每个客户端的通信:

def Create_connections():
   for i in range(nclients):
      # ...
      client.loop_start()
      client.connect("XXXXXXXXXX", XXXX, XX)

# ...
Create_connections()

while run:
   pass