SIM7000E

i have an issue using SIM7000E , i have non response when i try to test AT command:

here is the code :

/*!

 * @file     DFRobot_SIM7000_ATtest.ino

 * @n        SIM7000 needs 7-12V DC power supply

 * @brief    This example use the serial port to send AT command to control the SIM7000

 * @n        With initialization completed, we can enter AT command to SIM7000 directly

 * @n        Common AT commands :

 * @n        AT+CPIN? : Check SIM card

 * @n        AT+CSQ   : Check signal quality

 * @n        AT+CGATT?: Check net attached state

 * @n        AT+CSTT  : Start net connect task

 * @n        AT+CIFSR : Get local IP

 *

 * @n        Get the AT command table in Resource folder :SIM7000 Series_AT Command Manual_V1.01.pdf

 * @n        If you use Mega please connect PIN8 PIN10 and set PIN_RX = 10

 * @n        The AT command must end with CRLF

 *

 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)

 * @license     The MIT License (MIT)

 * @author      [TangJie]([email protected])

 * @version     V1.0.1

 * @date        2021-09-16

 * @url         https://github.com/DFRobot/DFRobot_SIM7000

 */

#include <DFRobot_SIM7000.h>

#include <SoftwareSerial.h>

#define PIN_TX     7

#define PIN_RX   10

SoftwareSerial     mySerial(PIN_RX,PIN_TX);

DFRobot_SIM7000    sim7000(&mySerial);

void setup() {

  Serial.begin(9600);

  mySerial.begin(19200);

  Serial.println("Turn ON SIM7000......");

  if(sim7000.turnON()){                             //Turn ON SIM7000

    Serial.println("Turn ON !");

  }

  Serial.println("Set baud rate......");

  while(1){

    if(sim7000.setBaudRate(19200)){               //Set SIM7000 baud rate from 115200 to 19200 reduce the baud rate to avoid distortion

      Serial.println("Set baud rate:19200");

        break;

      }else{

        Serial.println("Faile to set baud rate");

        delay(1000);

      }

  }

  mySerial.begin(19200);

  Serial.println("For example, if you type AT\\r\\n, OK\\r\\n will be responsed!");

  Serial.println("Enter your AT command :");

}

void loop() {

  mySerial.listen();

  while(mySerial.available()){

    Serial.write(mySerial.read());

  }

  mySerial.flush();

  while(Serial.available()){

    mySerial.write(Serial.read());

  }

}