jm + android + nat   1

Push notifications delayed, Hearbeat Interval not reliable - Google Product Forums
Good thread on GCM notifications and their interactions with NAT -- they are delivered over a single TCP connection to port 5228 to the google servers, kept alive, and NAT timeouts can hang the conn resulting in delayed notifications.

Particularly useful is the *#*#426#*#* dial code, which displays a log screen on Android devices with GCM debugging info.
android  gcm  google  push-notifications  nat  tcp 
june 2016 by jm

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