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my recollection: Signal uses Google cloud messaging to wake up the phone when the server receives a message for the user. The message itself does not go throu
by nebulous1 6y ago
my recollection:
Signal uses Google cloud messaging to wake up the phone when the server receives a message for the user. The message itself does not go through GCM. It does this because GCM was (is?) the only way to reliably wake up the phone on a push notification.
Libresignal removed GCM and used websockets for this wakeup message (?).
OpenWhisper didn't want them to use the Signal servers or the name Signal.