laravel4cookbook

Embedded Systems 301
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This file should be saved as workbench/formativ/embedded/src/Formativ/Embedded/Command/Serve.php.
We’re using PHP file read/write methods to communicate with the Arduino. In our fire() method,
we open a connection to the Arduino and store it in $this->device. We also set the stream to nonblocking.
This is so that read requests to the Arduino don’t wait until data is returned before allowing
the rest of the PHP processing to take place.
In the __construct() method we also modify the message event listener to write the incoming
message (from the browser) to the Arduino. We read any info the Arduino has and send it back
to the socket. This effectively creates a bridge between the Arduino and the socket.
We’ve also added two additional methods. The getArguments() method stipulates a required device
argument. We want the serve command to be able to use any device name, so this argument makes
sense. We’ve also added a __destruct() method to close the connection to the Arduino.
Finally, we need to add some JavaScript to read and write from the Arduino:
1 try {
2 if (!WebSocket) {
3 console.log("no websocket support");
4 } else {
5
6 var socket = new WebSocket("ws://127.0.0.1:8081/");
7 var sensor = $("[name='sensor']");
8 var led = $("[name='led']");
9 var x = $("[name='x']");
10 var y = $("[name='y']");
11
12 socket.addEventListener("open", function (e) {
13 socket.send("pinMode,6,output.");
14 socket.send("pinMode,3,servo.");
15 socket.send("pinMode,5,servo.");
16 });
17
18 socket.addEventListener("error", function (e) {
19 // console.log("error: ", e);
20 });
21
22 socket.addEventListener("message", function (e) {
23
24 var data = e.data;