event.forward.url no send POST data.

Hello,
My problem is that the app calls the bellit link but doesn't send it any DATA.

< entry key="event.forward.enable" >true< /entry >
< entry key='event.forward.url' >http://192.168.1.2/textevent.php< /entry >

The php code is here
php

session_start();
        if(isset($_POST)){
            $conn = new mysqli('localhost','root','7ryu1KP5wRkSCxGT','Uctovnictvo','3306');
            mysqli_set_charset($conn,"utf8");
                if ($conn->connect_error) {
                die("Connection failed: " . $conn->connect_error);
                } 

$text=implode("|",$_POST);				
        $addevent= "INSERT INTO `Dieta`( `spz`, `geoenter`, `geoid`, `time`, `poznamka`) VALUES ('{$_POST['device']['name']}','{$_POST['geofence']['name']}','{$_POST['event']['id']}','{$_POST['event']['serverTime']}','$text')";

if($conn->query($addevent) === TRUE){
            echo "OK" ;} 
    else {
        echo "Error" . $conn->error;
}
$conn->close();
}	 else {
                header("Location: index.php");
                exit;
            }
            
The ?_POST array is empty.

And why call the link 3x if is only one event?