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by nebulous1
1990 days ago
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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 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. |
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