How send method POST with JSON? Arduino UNO R3 + SIM900

Question

Why is the server side of php not loading any data from arduino? What did I do wrong?

 String reading="{\"latitude\": 12.983027, \"longitude\": 80.2594}";
 mySerial.println("AT+HTTPINIT"); 
 toSerial(1000);
 mySerial.println("AT+HTTPPARA=\"CID\",1"); 
 toSerial(1000);
 mySerial.println("AT+HTTPPARA=\"URL\",\"http://gerro.usermd.net/updateData.php\"");
 toSerial(1000);
 mySerial.println("AT+HTTPPARA=\"CONTENT\", \"application/json\"");
 toSerial(1000);
 mySerial.println("AT+HTTPDATA=" + String(reading.length()) + ",100000");
 toSerial(5000);
 mySerial.println(reading);
 toSerial(1000);
 mySerial.println("AT+HTTPACTION=1"); 
 toSerial(15000);
 mySerial.println("AT+HTTPREAD"); 
 toSerial(1000);
 mySerial.println("AT+HTTPTERM"); 
 toSerial(500);

Result:

AT+HTTPINIT
OK
AT+HTTPPARA="CID",1
OK
AT+HTTPPARA="URL","http://gerro.usermd.net/updateData.php"
OAT+HTTPPARA="CONTENT", "application/json"
OK
AT+HTTPDATA=46,100000
DOWNLOAD
OK
AT+HTTPACTION=1
OK
+HTTPACTION:1,200,55
AT+HTTPREAD
+HTTPREAD:55
array(0) {
}
array(0) {
}
nic ciekAT+HTTPTERM
OK

EDITING

void toSerial(int delay_ms)
 {
 delay(delay_ms);
 while(mySerial.available()) 
 {
 Serial.write(mySerial.read());
 }
 }

PHP

<?php
var_dump($_POST);
if (isset($_POST['latitude']) && isset($_POST['longitude']) && $_SERVER['REQUEST_METHOD'] === 'POST') {
//code
} else {
echo 'nic';
}

• SoreDakeNoKoto: What exactly does toSerial() do? Post all of it.
• wgerro: @hcheung as it tests with postman it all works and returns data from $ _POST. I think you tested it badly. In the php file there is var_dump ($ _ POST) and hence the result array (0) {}
• wgerro: @TisteAndii I've already edited the post.
• wgerro: on the server php shows that it does not receive CONTENT-TYPE and CONTENT-LENGTH from arduino
• wgerro: @hcheung maybe you haven't enabled the POST method

Answer 1

You had to change the php file:

var_dump($_POST);

to:

echo print_r(json_decode(file_get_contents("php://input")));

Thank you !