I'm new to push mobile app development, I have a requirement to push notifications on android and ios devices over wlan (without internet). I've searched about this so it seems its possible only with internet using FCM/APNs, but I want to achieve it without internet.
I have read about XMPP protocol, so setting up XMPP servers like OpenFire/Tigase can help me in this ?
I'm also wondering how smartwatch receive notifications over bluetooth without internet
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