what is fcm

fcm, the full name of "Firebase Cloud Messaging", is a cross-platform solution for messages and notifications for Android, iOS and web applications. It is currently available for free; the service is provided by Firebase, a company owned by Google.

#The operating environment of this tutorial: IOS13 system, iphone11 mobile phone.

Firebase Cloud Messaging (English: Firebase Cloud Messaging, usually referred to as FCM), also known as Firebase Cloud Messaging, formerly Google Cloud Messaging (GCM), is a A cross-platform solution for messaging and notifications for Android, iOS and web apps, currently available for free.

The service is provided by Firebase, a company owned by Google. Firebase was announced to be acquired by Google on October 21, 2014, and the price was not announced. [2] The official website of Google Cloud Messaging now points to Firebase Cloud Messaging as the new version of Google Cloud Messaging.

Due to the poor connection between mainland China and Google, most domestic applications in mainland China (such as QQ, etc.) are not connected to FCM and instead use the heartbeat mechanism to ensure message push. [4] WeChat was found to have built-in FCM in some Play versions, but it is believed that it may only be used to wake up related processes rather than push chat messages. In addition, Japan's instant messaging application Line also implements heartbeat mechanism push for accounts registered with mobile phone numbers in China and Taiwan, while accounts in other countries or regions and unbound mobile phone numbers use FCM push.

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