Hi all, I'm using mqtt (mosquitto v3.1) in a wireless sensor network of embedded devices which are subscribed to certain topics of a broker. On the other side, there is a mobile app publishing topics to the broker. The pub / sub process works fine, and with the advantage of Keep Alive messages and Will Topics, the mobile app can detect when an embedded device has been disconnected (usually due to battery exhaustion).
The weak point here occurs during the 'time window' in which the embedded device has drained it's battery and the broker is not still aware of that. In such case, if the mobile app publishes a topic it won't be received by the subscriber. Of course, I could queue messages, but that's not the way this scenario should work. Any advices on how to proceed? Thanks in advance. Regards, Juan
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