HTML can be printed directly using the client.println() function. When the server is running and a client is available (connected via a web browser), the client.println() function is used to send data to all the connected devices. Once the Ethernet class has been initialised, we need to tell the server to listen for incoming connections on port 80, this is the default port for HTML requests, you can change this port number, which I will be doing in the Node.js example. We start the Web Server by initialising the Ethernet class, to do this we need to call the Ethernet.begin() function and pass the required MAC and IP addresses to the function. Creating the Web Server in the Arduino IDE: Without any JavaScript or PHP, your page needs to be refreshed anytime the data changes. The example is pretty bare-bones, a HTML only website with no CSS styling or server side scripting functionality. This is not the ideal solution for creating a fully functioning HTML page but it is a very quick and easy way to control your Galileo via a web browser. The Arduino example does not conform to the full HTML page structure, and instead relies on printing text between the opening and closing HTML tags. The library supports up to four concurrent connection (incoming or outgoing or a combination). It can serve as either a server accepting incoming connections or a client making outgoing ones. The library allows the Arduino device to connect to the internet. Here’s how the library is explained on the Arduino website: The Galileo already has an Ethernet connection on board and fully supports the Ethernet library. The Web Server uses the Arduino Ethernet library to answer any HTTP requests made to the Galileo.
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