Making Things Talk

SESSIONLESS NETWORKS 243

You can see a few PHP tags in the

HTML. These add the PHP variables to

the HTML. Next, you need some code

in the script to read the form. Add the

following near the beginning of the

program, after the global variables,

but before you open the socket to the

XPort:

8

//if a filled textbox was submitted, get the values:

if ((isset($_POST["ip"])) &&

(isset($_POST["port"])) &&

(isset($_POST["packetsToRead"]))) {

$ip = $_POST["ip"];

$port = $_POST["port"];

$packetsToRead = $_POST["packetsToRead"];

}

Figure 7-11

The final web page of the toxic report.

Add two new variables to the

beginning of the program, one to get

the time, and one to make the HTML

code simpler to write:

// $messageString is used to return messages for printing in the HTML:

$messageString = "No Sensor Reading Taken";

// Get the time and date:

$timeStamp = $date = date("m-d-Y H:i:s");

8

To use these two variables, change

the lines that average and print the

sensor reading like so. You’ll get a page

that looks like Figure 7-11.

8

// average the readings from all the packets to get a

// final sensor reading:

$totalAverage = averagePackets($packets);

// update the message for the HTML:

$messageString =

"Sensor Reading at: ". $timeStamp . ": " . $totalAverage;

Continued from opposite page.

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