I'm building an open source application which is intended for users to self-host. Now, I would like to add push notifications on Android and iOS that would be sent from the self-hosted server application. Is there any alternative push notification service that does not require an API key (FCM, APNS) or per hosted instance registration (PushBullet) for this use case?
I've googled for this, but the only thing I've come across which even remotely resembles this is Pushjet.
Open source projects seem not to rely on Push Notifications, which is a shame considering how many great things can be done with them. I would really appreciate any and all suggestions.
To clarify, the project can't use Firebase, PushBullet, APNS or similar because all of these either require the developer to publish an API key in their app (Firebase) or require the user to register their clients and servers individually with a service like Pushbullet.
This question is specifically about avoiding this registration requirement and using some "public push" type service (if one exists).
Some examples of exactly what I'm trying to avoid:
- https://julienrenaux.fr/2015/06/25/ios-android-push-notifications-100-free-and-self-hosted-for-wordpress-using-cordova-and-ionic/
- https://home-assistant.io/components/notify.pushbullet/
- https://github.com/mattermost/mattermost-push-proxy/blob/master/README.md
For anyone who's curious, the project is here: http://gitlab.mccollum.enterprises/icing/