[arduino code examples for A32 Pro]-10 How to test AT command with SIM7600 4G modulde

Code:
/*

  Made by KinCony IoT: https://www.kincony.com

  All rights reserved.



  ESP32-S3 with SIM7600 and RS485 Communication

  This program sends an AT command to the SIM7600 4G module every 3 seconds to query its model number.

  The response from the SIM7600 is then sent out through the RS485 interface.



  Connections:

  SIM7600:

    TXD: GPIO18

    RXD: GPIO17

  RS485:

    TXD: GPIO9

    RXD: GPIO8

*/



#include <HardwareSerial.h>



// Create a hardware serial object for SIM7600 communication using UART2

HardwareSerial sim7600(2); // UART2: TXD on GPIO18, RXD on GPIO17



// Create a hardware serial object for RS485 communication using UART1

HardwareSerial rs485(1);   // UART1: TXD on GPIO9, RXD on GPIO8



void setup() {

  // Initialize the default serial port for debugging (Serial Monitor)

  Serial.begin(115200);        // Baud rate of 115200 for debugging



  // Initialize the SIM7600 serial port with baud rate of 115200

  // Set TX to GPIO18 and RX to GPIO17

  sim7600.begin(115200, SERIAL_8N1, 17, 18);



  // Initialize the RS485 serial port with baud rate of 9600

  // Set TX to GPIO9 and RX to GPIO8

  rs485.begin(9600, SERIAL_8N1, 8, 9);



  // Wait for 3 seconds before starting (optional, can be used for initialization delay)

  delay(3000); 

}



void loop() {

  // Send the AT command to query SIM7600 module model number

  // "AT+CGMM" is the command used to get the model of the SIM7600

  sim7600.println("AT+CGMM");



  // Wait for 1 second to allow time for the SIM7600 to respond

  delay(1000);



  // Check if there is any data available from the SIM7600 module

  if (sim7600.available()) {

    // Create a string to store the response from the SIM7600

    String simResponse = "";



    // While data is available from the SIM7600, read it byte by byte

    while (sim7600.available()) {

      // Read one byte from the SIM7600 serial

      char c = sim7600.read();

      // Append the byte to the response string

      simResponse += c;

    }

    

    // Send the SIM7600 response to the RS485 serial port

    rs485.print(simResponse);



    // Also print the response to the Serial Monitor for debugging

    Serial.println(simResponse);

  }



  // Wait for 3 seconds before sending the next query

  delay(3000);

}