Android Question confirmation of receipt in MQQT

Erel said:

Set the QOS to 1+: https://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels/

If you are worried about offline clients then best to implement something on the application layer. Send a confirmation message.

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thank you. yes indeed, I think I should develop a routine to evaluate the offline, there is no idea of how this routine should be, I have several ideas but I would like something that does not complicate the programming