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](jie.tang@dfrobot.com)

* @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());

}

}