Question

如何为PUBACK和PUBREL生成数据包，最重要的是，您如何知道收到的消息的packetId是什么？

我希望能够自己处理PUBREL和PUBACK的逻辑。下面的代码应该暗示我正在尝试做什么。

import paho.mqtt.client as mqtt
import paho.mqtt.publish as publish
from multiprocessing import Process, Queue  
# 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("/test")

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))
def my_function(id):
    client = mqtt.Client(client_id="id", clean_session=False,userdata=None, protocol=MQTTv311)
    client.on_connect = on_connect
    client.on_message = on_message

    client.connect("127.0.0.1", 1883, 60)
    msgs = [{'topic':"/test", 'payload':"ClientId: " +id }, 'QoS': 2, 'retain': False),
    {'topic':"/test", 'payload':"ClientId: " +id }, 'QoS': 2, 'retain': False),
    {'topic':"/test", 'payload':"ClientId: " +id }, 'QoS': 2, 'retain': False)]
    publish.multiple(msgs, hostname="127.0.0.1", port=1883,client_id=id, keepalive=60,will=None, auth=None, tls=None, protocol=mqtt.MQTTv311)
    # 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()
for i in range(0,10):
    p = Process(target=my_function, args=(str(i))

Answer 1

在研究可能的MQTT漏洞时遇到了这个问题。据我所知，Paho没有任何模块可以处理更多的低级数据包，因此您可以使用Scapy's MQTT module。

Scapy是Python中的一个模块，允许您处理各种协议的数据包，以下是使用scapy发送MQTT CONNECT的方法：

from scapy.contrib.mqtt import MQTTConnect
from scapy.all import send, IP, TCP

mqtt_broker_ip = '192.168.0.1'
mqtt_broker_port = 1883

ip_pkt = IP(dst=mqtt_broker_ip)
tcp_pkt = TCP(dport=mqtt_broker_port)
mqtt_pkt = MQTTConnect(clientId='my_client_id')

# use slashes (/) to stack protocols 
final_pkt = ip_pkt/tcp_pkt/mqtt_pkt

send(mqtt_pkt)

你如何在python mqtt（paho库）中设置puback和pubrel？

1 个答案: