<?
// this file is executed once a second by the CRON scheduler on Wattmon

// open a file for read/write

$f = fopen("/counter.txt",'r');

// get the contents as a string and convert to an int

$cnt = intval(fgets($f));

// if the value does not match the old value, echo it to the console (serial)

if ($cnt != $_GLOBALS['rwcnt']) {
printf("Mismatch in write, value=%d but expected=%d",$cnt,$_GLOBALS['rwcnt']);
log("Mismatch in write, value=%d but expected=%d",$cnt,$_GLOBALS['rwcnt']);
}

$cnt++;
$_GLOBALS['rwcnt']=$cnt;

// echo the value to the console

print("Write counter: ".$cnt."\r\n");

// reopen the file for writing

fclose($f);
$f = fopen("/counter.txt",'w');

// write the new value back to the SD card

fwrite($f,strval($cnt)."\r\n");

// close file
fclose($f);
?>