Connect To Firebase Functions Emulators Over Local Network From A Flutter App

I am trying to connect to my Firebase functions emulators from my test Android device. When I run the emulators the output is: ┌────────────────�

Solution 1:

By default, all the emulators will listen to localhost only and not your local network.

I tried replicating your issue by running my hosting emulator on the whole network and functions emulator only on localhost as in the following screenshot.

const firebaseConfig = {...}
firebase.initializeApp(firebaseConfig);

firebase.functions().useEmulator("192.168.0.102", 5001);

var addMessage = firebase.functions().httpsCallable('addMessage');
addMessage({ text: "messageText" }).then((result) => {
  // Read result of the Cloud Function.var sanitizedMessage = result.data.text;
}); 

I copied the sample function from the documentation and tried calling the function and as expected:

If you serve the functions using firebase serve --only functions --host 0.0.0.0 it should make functions available for your network.

Alternatively, you can specify that in your firebase.json like this:

{
  "functions": {
    "predeploy": "npm --prefix \"$RESOURCE_DIR\" run build"
  },
  "emulators": {
    "functions": {
      "port": 5001,
      "host": "0.0.0.0"
    }
  }
}

Then you can simply start the emulators using firebase emulators:start.