laravel4cookbook

Embedded Systems 296
43 $this->socket
44 )
45 ),
46 $port
47 );
48
49 $this->info("Listening on port " . $port . ".");
50 $server->run();
51 }
52
53 protected function getOptions()
54 {
55 return [
56 [
57 "port",
58 null,
59 InputOption::VALUE_REQUIRED,
60 "Port to listen on.",
61 8081
62 ]
63 ];
64 }
65 }
.
This file should be saved as workbench/formativ/embedded/src/Formativ/Embedded/Command/Serve.php.
These four files create a means with which we can start a socket server, listen for messages and
respond to them. The shared.js file connects to this server and allows us to send and receive these
messages. It’s simpler than last time; but sufficient for our needs!
Connection To Arduino
Real-time communication is typically done through a software layer called Firmata. There are
Firmata libraries for many programming languages, though PHP is not one of them. While there is
one library listed on the official Firmata website, I could not get it to work.
So we’re going to create our own simple Firmata-like protocol. I managed to put one together that
handles analog reads, analog writes and servo control. It does this by parsing strings received over
serial connection. This is what it looks like: