Supports ESP SDK version 1.1.1 and above (AT version 0.25 and above). If you need to update the ESP firmware follow this guide.
The main WiFiEsp library features are:
- APIs compatible with standard Arduino WiFi library.
- Use of standard ESP firmware through AT commands (no need to flash a custom firmware).
- Support hardware and software serial ports.
- Configurable tracing for troubleshooting.
First of all you have to connect the ESP module to your Arduino board.
I have developed my own cheap ESP WiFi Shield using an ESP-01 module. Look at this Instructable on how to build it.
Now follow these set of articles to see how to use the WiFiEsp library for your projects.