I try to create a push notifications project that send to iOS and Android concurrently in the same moment.
I'm going to try V-Play plugin: https://v-play.net/doc/plugin-gcm/ but from guide, I can't find how to set Google Cloud Messaging in Firebase.
There is a tutorial that step by step permit to configure and try the cross platform notifications? Or could anyone see how to set the code correctly? Also I saw OneSignal, is it better then GCM?
OneSignal is one of the most used push notification services now and a great solution. You can find an integration guide with step-by-step instructions and example code to make it work with Qt & QML here: https://v-play.net/doc/plugin-onesignal/
The push notifications are available in the Firebase Qt Plugin: https://v-play.net/doc/plugin-firebase/