shield GSM GPS SIM808 UNO - Serial communication problem - jumpers

Hardware Arduino GSM Shield
1

Hello,

Arduino novice user I try to make a moto alarm based on SIM808 shield and arduino UNO.

I buy this kit SIM808 kit : https://www.aliexpress.com/snapshot/0.html?orderId=82650808744830&productId=32271825455

The shield is well plugged on arduino UNO

I tried different software librairies first to communicate by software serial
such as :

#include <SoftwareSerial.h>
SoftwareSerial GSMSerial(7, 8);
void setup()
{
*GSMSerial.begin(19200); // the GPRS/GSM baud rate *
*Serial.begin(19200); // the GPRS/GSM baud rate *
}
void loop()
{
if(Serial.available())
GSMSerial.print((char)Serial.read());
else if(GSMSerial.available())
Serial.print((char)GSMSerial.read());
}

or other basic soft with "specific" librairy :

#include <Arduino.h>
#include "SoftwareSerial.h"
#include "ElementzGSM.h"
SoftwareSerial myserialOut(6, 7);
ElementzGSMshield GSM(&myserialOut);
void setup(/* arguments */) {
_ /* code */_

  • Serial.begin(9600);*
  • GSM.begin(9600);*
  • Serial.println("Starting");*
  • delay(2000);*
  • GSM.SendAT("AT", "OK", 1000, 2);*
  • GSM.SendAT("AT+CREG?", "+CREG: 0,0", 1000, 2);*
    }
    void loop(/* arguments */) {
    }

My soft is ok and compiles well but I did not succeed to establish serial communication :
serie monitor does not return any data.

First I thank it was due to supply power (UNO card current limit) of the shield then
I supplied with external 5V alimentation but without success...

My main question is about jumpers configuration. I did not find accurate jumpers position
for software serial conf for my shield (some shield have 6 PIN but mine have 8 PIN)

Has anybody used this shied or can find the jumper position by deduction ?
Or has any other idea to know why it does not work. ?

Cf attached file to see my jumpers conf based on other shield information and photo
on the web...

Thanks for your answers!

Alexis

SIM808 jumpers config.jpg