main.cpp

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

#define LEDPIN 5

SoftwareSerial imbleSerial(2, 3);

void setup() {
	Serial.begin(115200);
	pinMode(LEDPIN, OUTPUT);
	imbleSerial.begin(19200);
}

void loop() {
	while(imbleSerial.available()){
		String receivedData = imbleSerial.readString();
		int indexOfColon = receivedData.indexOf(':');
		if(indexOfColon){
			/* コマンドを受信 */
			String receivedCommand = receivedData.substring(indexOfColon + 1, indexOfColon + 3);
			switch (receivedCommand.toInt()){
			case 1:
				digitalWrite(LEDPIN, HIGH);
				break;
			case 2:
				digitalWrite(LEDPIN, LOW);
				break;
			default:
				break;
			}
			Serial.println(receivedCommand);
		}else{
			Serial.println("err invalid message");
		}
	}
}