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

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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);
}

arduino ino file download: 
  10-4g-sim7600.zip (Size: 1.04 KB / Downloads: 40)
BIN file (you can use esp32 download tool download to ESP32-S3 with address 0x0 then directly to use) download: 
  10-4g-sim7600.ino.merged.zip (Size: 182.27 KB / Downloads: 49)