https://github.com/khoih-prog/BlynkEthernet_WM

This is the library designed to help you eliminate hardcoding your Blynk Credentials in Teensy (3.x, 4.0) and Arduino Mega 1280, Mega 2560 boards using Ethernet shields (W5100, W5200, W5500, etc).

You can update Blynk Credentials any time you need to change via Configure Portal. Data are saved in configurable locations in EEPROM.

This is the link to Blynk

http://docs.blynk.cc

Blynk was designed for the Internet of Things. It can control hardware remotely, it can display sensor data, it can store data, visualize it and do many other cool things.

Click image for larger version. 

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