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https://issues.apache.org/jira/browse/AMQ-9592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Baptiste Onofré updated AMQ-9592:
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Fix Version/s: 6.2.0
6.1.4
5.18.7
> Incorrect MQTTv3.1.1 behaviour: QoS2 messages were delivered to unintended
> consumers
> -------------------------------------------------------------------------------------
>
> Key: AMQ-9592
> URL: https://issues.apache.org/jira/browse/AMQ-9592
> Project: ActiveMQ Classic
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 5.18.5, 6.1.3
> Reporter: Ken Liao
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 6.2.0, 6.1.4, 5.18.7
>
>
> To replicate:
> - Run a subscriber with QOS2 to a topic with client ID say "1"and stop it
> - Publish 5 messages to the topic, do not consume these yet.
> - Run another subscriber with QOS2 to the topic with a different client ID
> say "2'.
> - This subscriber with different cliend ID receives 5 messages that were
> intended for the clientID "1". However, this does not mean that client ID "1"
> will not receive the 5 messages when it comes back online. I noticed that
> client ID "1" also received the 5 message.
> Now that both clientID 1 and 2 received messages, subscribing a new clientID
> doesn't receive these message. However, if we send 5 message again to the
> topic and do not consume it for all clientIDs, it would delivered to any new
> subscription.
> For new client Id broker must create new session, so messages sent after
> client 1 disconnected should route to client 1 only since client 2 because it
> was connected after those 5 messages were sent (hence the new session of
> client 2 shouldn't contain old messages).
> Here are sample codes to reproduce:
> The producer Python script
> {code:python}
> import paho.mqtt.client as mqttClient
> import time
> import ssl
> # context = ssl.create_default_context()
> Connected = False
> broker_address= "localhost"
> port = 1883
> user = "admin"
> password = "admin"
> 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")
> client = mqttClient.Client(client_id="producer",transport="tcp") #
> client.username_pw_set(user, password=password) #set username and password
> client.on_connect=on_connect
> # client.tls_set_context(context=context)
> client.connect(broker_address, port=port)
> client.loop_start()
> i=0
> while True:
> time.sleep(1)
> i=i+1
> client.publish("test/data", "This is my test msg 123.",2,False)
> print("Sent"+str(i))
> {code}
> The consumer Python script
> {code:python}
> import paho.mqtt.client as mqttClient
> import time
> import ssl
> Connected = False
> broker_address= "localhost"
> port = 1883
> user = "admin"
> password = "admin"
> def on_connect(client, userdata, flags, rc):
> if rc == 0:
> print("Connected to broker")
> global Connected #Use global variable
> Connected = True #Signal connection
> print(flags)
> client.subscribe("test/data",2)
> else:
> print("Connection failed")
> def on_message(client, userdata, msg):
> print(msg.topic+" "+str(msg.payload))
> client =
> mqttClient.Client(client_id="id2",transport="tcp",clean_session=False) #
> client.username_pw_set(user, password=password) #set username and password
> client.on_connect=on_connect
> client.on_message=on_message
> # client.tls_set_context(context=context)
> client.connect(broker_address, port=port)
> client.loop_start()
> while Connected != True:
> time.sleep(0.1)
> time.sleep(1000)
> {code}
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