A PPP example application and library can be found here.
The web page to be loaded by the KW41z is shown below. Pressing the LED ON button sends a POST request with button=1. Conversely with LED OFF the it sets button=0.
<html>
<head><title>A simple Web Server</title></head>
<body>
<h1>COMP3215</h1>
<form action="" method="post">
<button name="button" value='1'>LED ON</button>
<button name="button" value='0'>LED OFF</button>
</form>
</body>
</html>
In lines 893-894 in the httpResponse() function, the value of button is extracted using strstr().
...
httpGetLedOff = strstr(dataStart,"button=0");
httpGetLedOn = strstr(dataStart,"button=1");
...At the bottom of the response handler the LED state is then handled (lines 943-953).
...
if(httpGetLedOn) {
// put something here to send RF to turn on LED
led1 = 0;
memcpy(n+dataStart,body,sizeof(body));
n = n + sizeof(body)-1; // one less than size
} else if(httpGetLedOff) {
// put something here to send RF to turn off LED
led1 = 1;
memcpy(n+dataStart,body,sizeof(body));
n = n + sizeof(body)-1; // one less than size
}
...After setting the state of the LED, the webpage is then reserved to the host.