android - mqtt client active on the smart device to be usable -
can confirm in order use mqtt protocol, app on smart device (ios or android) embedding mqtt client code, must active? if so, how can wake-up app remote server enable mqtt conversation? maybe push notification should alert smartphone user open app because important messages outstanding him?
for android app can start service run in background , receive published messages time.
for ios need wake application connect broker, usual approach use apple push notification service wake app up.
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