如何发送推送通知Firebase

Question

I am new to Firebase and the main reason I adapted to it from my old MySql DB is the ability to send push notification and dynamic links. I have been trying for the past two days to send notification to a group of people who have subscribed to a topic from my node.js script. The script always returns InternalServerError . I am able to send notification from the Firebase console but that is not good enough for my app as I need to implement dynamic notification (ie triggered by one users action).

So far I did not understand what was in the official docs and tried following a tutorial I found and I am currently here

app.get('/push',function(req,res){
  /*var title = req.params.title;
  var body = req.params.body;*/
//  var confName = req.params.name;
  var message = { //this may vary according to the message type (single recipient, multicast, topic, et cetera)
      to: '/topics/ilisten',
    //  collapse_key: 'your_collapse_key',

      notification: {
          title: 'This is Title',
          body: 'This is body'
      },

      data: {  //you can send only notification or only data(or include both)
          my_key: 'Conf Name here'
      }
  };
  fcm.send(message, function(err, response){
    if (err) {
        console.log("Something has gone wrong!"+err);
    } else {
        console.log("Successfully sent with response: ", response);
    }
});
})

My first question is what should I do in the to field so that all the users in my app reciece the notification.

I would also like to take a look at correct and complete implementation of this concept with android code. If anyone has such code please share it here as it would help the future Firebase users who cannot understand the official docs like me.

Answer 1

Following is one approach using node-gcm ( https://github.com/ToothlessGear/node-gcm )

  var gcm = require('node-gcm');

  var sender = new gcm.Sender(<sender_key>);

  var message = new gcm.Message();
  message.addNotification('title', title);
  message.addNotification('body', body);

  sender.send(message, { topic: "/topics/" + topic }, function (err, response) {
    if (err) console.error(err);
    else console.log(response);
  });