Libraries:-
https://github.com/FirebaseExtended/f...
https://github.com/bblanchon/ArduinoJ...
How To Send Arduino/NodeMCU ESP8266 Sensor Data To Android App:-
1. Connect NodeMCU ESP8266 To Firebase realtime database:- • How To Send Arduino/NodeMCU ESP8266 S...
2. Create app using MIT App Inventor2:- https://appinventor.mit.edu/