As part of my Arduino Soil Moisture Transmitter and Receiver project this is the Android app which listens to the plants topic from Google Firebase and triggers an alert when an item on the topic is received.
This is a bare bones simple app with a horrible UI and no other features. It's simply meant to trigger a notification to myself when I receive an event from FCM. I might improve upon it in the future.
Soil Moisture Sensor Transmitter and Receiver: https://github.com/DaveBben/Soil_Moisture_Transmitter_Reciver Google Cloud Function: https://github.com/DaveBben/fcm_soil_notification_function