blink-lora.cpp

#include <Arduino.h>
#include <SoftwareSerial.h>

#define RX_PIN 1
#define TX_PIN 2
#define LED 4

void handleCommand(const String &command);

SoftwareSerial LoRaSerial(RX_PIN, TX_PIN);


void setup() {
    LoRaSerial.begin(115200);

    pinMode(LED, OUTPUT);

    // Initialize LoRa module
    LoRaSerial.println("AT+RESET");
    digitalWrite(LED, HIGH);
    delay(2000); // Wait for module to reset
    digitalWrite(LED, LOW);

    // Set unique address for receiver
    LoRaSerial.println("AT+ADDRESS=2");
    delay(100);
    digitalWrite(LED, HIGH);

    // Set network ID
    LoRaSerial.println("AT+NETWORKID=10");
    delay(100);
    digitalWrite(LED, LOW);

    // Set RF frequency to 433 MHz
    LoRaSerial.println("AT+BAND=433000000");
    delay(100);
    digitalWrite(LED, HIGH);

    // Set RF parameters: SF=7, BW=125KHz, CR=4/5, Preamble=12
    LoRaSerial.println("AT+PARAMETER=7,7,1,12");
    delay(100);
    digitalWrite(LED, LOW);
}

void loop() {
    if (LoRaSerial.available()) {
        String response = LoRaSerial.readStringUntil('\n');

        if (response.startsWith("+RCV=")) {
            int firstComma = response.indexOf(',');
            int secondComma = response.indexOf(',', firstComma + 1);
            int thirdComma = response.indexOf(',', secondComma + 1);
            String data = response.substring(secondComma + 1, thirdComma);

            handleCommand(data);
        }
    }
}

void handleCommand(const String &command) {
    if (command == "COLOR BLUE") {
        digitalWrite(LED, HIGH);
    } else if (command == "COLOR RED") {
        digitalWrite(LED, HIGH);
    } else if (command == "COLOR OFF") {
        digitalWrite(LED, LOW);
    } else {
    }
}