void setup() {
  Serial.begin(115200); // Serial Monitor for debugging
  Serial1.begin(115200); // Serial1 for RYLR998 at 9600 baud
  delay(2000); // Wait for RYLR998 to stabilize

  Serial.println("Starting RYLR998 receiver configuration...");

  // Configure RYLR998 with AT commands and verify responses
  sendATCommand("AT+FACTORY", "+OK"); // Reset to factory settings
  delay(1000);
  sendATCommand("AT+BAND=915000000", "+OK"); // Set frequency to 915MHz
  delay(1000);
  
  // Retry setting address up to 3 times
  for (int i = 0; i < 3; i++) {
    sendATCommand("AT+ADDRESS=2", "+OK"); // Set receiver address to 2
    delay(1000);
    String address = sendATCommand("AT+ADDRESS?", "+ADDRESS"); // Verify
    if (address.indexOf("+ADDRESS=2") != -1) {
      Serial.println("Address set successfully to 2");
      break;
    } else {
      Serial.println("Retry " + String(i + 1) + ": Failed to set address");
    }
  }
  
  sendATCommand("AT+NETWORKID=6", "+OK"); // Set network ID
  delay(1000);
  Serial.println("Receiver initialized");

  // Verify configuration
  sendATCommand("AT+BAND?", "+BAND"); // Check frequency
  sendATCommand("AT+ADDRESS?", "+ADDRESS"); // Check address
  sendATCommand("AT+NETWORKID?", "+NETWORKID"); // Check network ID
  sendATCommand("AT+UART?", "+UART"); // Check baud rate
  sendATCommand("AT+VER?", "+VER"); // Check firmware version
}

void loop() {
  // Check for incoming serial data from RYLR998
  if (Serial1.available()) {
    String received = Serial1.readStringUntil('\n'); // Read incoming message
    Serial.print("Received: ");
    Serial.println(received); // Print all data for debugging
  }
}

// Helper function to send AT command and print response
String sendATCommand(String command, String expected) {
  Serial1.println(command);
  Serial.print("Sent AT: ");
  Serial.println(command);
  String response = waitForResponse(2000); // Wait up to 2 seconds
  Serial.print("Response: ");
  Serial.println(response);
  if (!response.startsWith(expected)) {
    Serial.println("Warning: Unexpected response for " + command);
  }
  return response;
}

// Helper function to read response from RYLR998
String waitForResponse(unsigned long timeout) {
  unsigned long start = millis();
  String response = "";
  while (millis() - start < timeout) {
    if (Serial1.available()) {
      response += Serial1.readStringUntil('\n');
      if (response.length() > 0) return response; // Return on first complete response
    }
    delay(10); // Small delay to prevent tight loop
  }
  return response; // Return empty or partial response if timeout
}