Serial Responder

#include <Arduino.h>

void serialReadCall() {
  if (Serial.available() > 0) {
    String recivedDataStr = "";
    char recivedChar;
    while (Serial.available() > 0) {
      recivedChar = Serial.read();
      if (recivedChar != '\n') {
        // Concatena valores
        recivedDataStr.concat(recivedChar);
      }
    }
    //Serial.println(recivedDataStr);
    if (recivedDataStr.indexOf("$") >= 0) {
      Serial.println("Device");
    }
    
   
    }
    //FIM EVENTO READ

}

//SETUP INFORMATIONS
void setup() {
  Serial.begin(115200);

}

void loop() {
  serialReadCall();
}