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A comment on Gotify – a self-hosted push-notifications service. Parent comment

Re:Gotify – a self-hosted push-notifications service by fyfy18 on Saturday March 09, 2019 @05:20PM (#19348878)
TCP connection can be open and idle for hours without keep alives. This can easily be configured with kernel parameters:

https://www.tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepaliv...

I suspect the hard bit for normal apps is keeping the app active on the device while it is in the background. Google has their FCM receiver running as a low level service so can make sure it is always running.

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Re:Gotify – a self-hosted push-notifications service by ktjfi on Saturday March 09, 2019 @07:40PM (#19349497)
You can configure it locally in your kernel, but your ISP will most likely close your connections for you, especially if you're behind a CGNAT.
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Re:Gotify – a self-hosted push-notifications service by londons_explore on Sunday March 10, 2019 @12:43AM (#19350558)
Even if you have native IPv6, some carriers do connection tracking anyway to prevent random port scans from the internet waking up your phone or trying various exploits.
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