问题
I am currently developing an Android app and I would like to include Firebase Cloud Messaging. I was planning to have a Raspberry Pi checking a website every 5 Minutes or so and sending push notifications when something changed. In the official documentation they say that I need an 'app-server' in order to send messages via Firebase.
Does that mean I need to have my Raspi up and running as a server 24/7 and need a static IP / Domain for it? Or is it enough to have my Raspi send the message via the Api (https://fcm.googleapis.com/fcm/send) as I only need downstream messages?
Any help and explanation would be highly appreciated as I can't find a definite answer in any thread or documentation.
回答1:
You don't as such need an app-server for just one device. If you have some sort of internet connectivity on your Raspberry Pi device, all you need to do is make a request to the firebase API.
Firebase (Google servers) will handle the rest by pushing notifications to all the registered devices.
回答2:
Sending downstream messages (messages to devices) requires that you specify the FCM server key. This key allows sending FCM messages on your behalf, so should only be used on environments you trust.
Typically this means a server that you control. But the recently launched Cloud Functions for Firebase can also serve as such a trusted environment. After all: only developers who have access to your Firebase project can access your Cloud Functions code, and those developers can already send messages using the Notification panel in the Firebase console.
Any device you control in your own environment is also fine as a trusted environment. It doesn't have to have a fixed IP address, since the FCM server typically receives its instructions through XMPP or (more commonly these days) through the Firebase Database. Both of these approaches initiate the connections from the trusted device to Google's servers, so can run without accepting incoming connections.
回答3:
You don't need any server to implement FCM.
来源：https://stackoverflow.com/questions/45016835/is-a-server-required-for-firebase-cloud-messaging