Script php to receive wifi data

I have a Wi-Fi sender sensor (CC3200 from texas instruments) and I want to send the data via wifi to a database MySQL local (local PC).

The sensor metric is configured as a http client.

In the PC I have installed XAMPP , the database already developed, a Script PHP ( servidor.php ) that serves as the gateway for the data of the speck.

I put said Script below:

<?php

//incluimos el script insertarbd.php donde tenemos la función crear_base_datos()    
include 'insertarbd.php';
//incluimos el script de emergencias.php
include 'emergencias.php';

//Cogemos de la url el valor de los sensores enviados por el PIC mediante $_GET
@$buffer=$_GET["value"];
//@$buffer=$_POST["value"];

//Llamamos a la función crear_base_datos que se va encargar de almacenar en la base 
//de datos los valores de los sensores
crear_base_datos($buffer);

//llamamos a la función de emergencias
//emergencias();

//Almacenamos los datos en un fichero de texto (Opcional)
$DescriptorFichero = fopen("fichero_prueba.txt","w"); 

//Escribimos la primera línea dentro de él 
fputs($DescriptorFichero,$buffer); 

//Cerramos el fichero 
fclose($DescriptorFichero); 

?>

In a previous project all this worked for me, but now I have changed my sensor and when I send the data the following happens to me (according to the capture with Wireshark ):

**HTTP/1.1 400 Bad Request**

My questions are:

• Should I put the directory in the "GET" message? That is, do I have to do a GET with "/servidor.php?value=123456\n" or do I have to include the directory "/xampp/htdocs.../servidor.php?value=123456" ?
• Is there a problem for this connection between the sensor and the database to occur using a Script PHP that you have not taken into account?