Hello, everyone. This is my first post in internet. First I mean really first for all the time :) So let's try to explain. We use broker activeMQ version 5.15.4 and MQTT 3.1.1 client (mobile application). I adjusted broker and wrote MQTT client. I have only one problem now with durable subscriptions. MQTT client make successfull connect to Topic (let it be ABC) with specified parameters and subscribe. So durable subscription created. I see this durable subscription in ActiveMQ brkoer in Active durable subscriptions. When I manually disconnect active durable subscription moves to offline durable subscriptiion. After that I send messages to this Topic ABC and they keeps enqueued. When I connect I use subscribe method and Offline durable subscription becomes Active durable subscription and I get all these messages from Topic ABC. But if I connect to Topic ABC and not disconnect manually and connection lost (mobile internet turned off or wi-fi turned off, no matter) this subscription stays Active durable subscription (but in fact client is offline). And if there were sent messages to this Topic ABC while client was offline due to connection problem, all messages are dequeued automatically but nowhere. So logically, when client becomes offline he can not inform broker that he is offline, but is it real or maybe there something on broker side, that could tell broker not to dequeue message. I mean maybe broker can send some kind of ping request to client before dequeueing this message and if no ping response move this active durable subscription to offline durable subscription.
For now due to this problem we have to connect, send all messages, that were manually stored before and recieve all messages in subscription topic and then disconnect to make it offline, so in that case messages won't be lost (of course if for this period connect-disconnect there was not unexpectable disconnect). Sorry for my English and if there were same posts already. Could you please help me if it can be solved. -- Sent from: http://activemq.2283324.n4.nabble.com/ActiveMQ-User-f2341805.html
