Implementing a simple web server

The Arduino WiFi Shield can also be configured and programmed as a web server to serve client requests similar to the Arduino Ethernet shield. In the next step, we will be making a simple web server to send Wi-Fi signal strength over the Internet to a client. This requires that the WiFi shield has 1.1.0 firmware to work. The default factory loaded version 1.0.0 will not work. (See the Firmware upgrading section.)

Reading the signal strength over Wi-Fi

To read the signal strength over Wi-Fi:

1. Open a new Arduino IDE and copy the sketch named B04844_02_07.ino from the Chapter 2 sample code folder.
2. Verify and upload the Arduino sketch in to the Arduino board. Type the IP address of your WiFi shield in your web browser and hit the Enter key. The web page will load and display the current RSSI of the Wi-Fi network and refresh every 20 seconds. If you don't know the IP address of your Arduino WiFi shield assigned by the DHCP, open the Arduino Serial Monitor and...