How to send a FCM when a time event occurs in the

问题:

I am positive that I can send a Firebase Cloud Message when a record is added to the database or when some other database event occurs. My question is, if I have a record that needs to send a notification to a certain group of devices at a certain time, would I be able to do that easily? Is this something I could do on Google App Engine?

Example:

I have a list of records with different time values in them. When the time value of that record is equal to that of the server machine, send the message.

回答1:

There is no hidden magic here. You'll have to write code that listens for the changes in the database and then calls Firebase Cloud Messaging.

ref.on('child_added', function(snapshot) {
  request({
     url: 'https://fcm.googleapis.com/fcm/send',
     method: 'POST',
     headers: {
       'Content-Type' :' application/json',
       'Authorization': 'key=AI...8o' 
     },
     body: JSON.stringify(
       { data: {
           message: "your message"
         },
         to : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
       }
     )
   }, function(error, response, body) {
     if (error) { 
       console.error(error); 
     }
     else if (response.statusCode >= 400) { 
       console.error('HTTP Error: '+response.statusCode+' - '+response.statusMessage); 
     }
     else {
       console.log('Message sent');
     }
   });      
})

The above snippet of JavaScript would run in code and calls the Firebase Cloud Messaging HTTP endpoint to send a message.

Also see:

• How can I send a Firebase Cloud Messaging notification without use the Firebase Console?
• Firebase, send message to specific platform (Android)