How to send Android push notification locally using ADB without need network connection

Requirements:

• Device should be a rooted (simulator’s are rooted by default)
  
• adbd should be started as root. (Rub command: adb root )
  

Now, send local push message using command:

adb shell am broadcast \
  -n com.your.app/com.google.firebase.iid.FirebaseInstanceIdReceiver \
  -a "com.google.android.c2dm.intent.RECEIVE" \
  --es "extra1" "65" \
  --es "guid" "1f400184-9215-479c-b19a-a9cd9a1d9dc9" \
  --es "extra3" "VALUE" \
  --es "extra4" "'Long string with spaces'"

What’s happening?

• Simply, using adb we are broadcasting message with parameters.
  
• adb shell am broadcast command that broadcasts.
  
• -n parameter for define component (see IntentSpec@ADB Documentation)
  
• We are broadcasting for com.google.firebase.iid.FirebaseInstanceIdReceiver, because we are using Firebase Messaging Service
  
• We are sending action -a com.google.android.c2dm.intent.RECEIVE because FirebaseInstanceIdReceiver defines this in AndroidManifest.xml file.
  
  • Also, this is why we need to be root. This action requires Signature level permission.
    
• We are adding extras with --es parameter.
  

Now, we can get data in onMessageReceived under the FirebaseMessagingService. When user taps notification remoteMessage.getData().get("extra1") should be return "65".

Related gist page:
https://gist.github.com/tolpp/45801406e13ed7c88fb768352bb39f9b