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Re:Gotify – a self-hosted push-notifications service by jjeaff on Sunday March 10, 2019 @12:05AM (#19350400)
Signal uses gcm to push to the phone thus waking it so it can download any messages. Not sure about the others though.
Re:Gotify – a self-hosted push-notifications service by zuron7 on Sunday March 10, 2019 @12:20AM (#19350458)
If you don't have Google Play Services, it doesn't use GCM.