/* Test of the variable transfer from a smartphone (P) to
   Arduino (A). It supposed to happen  only when the 
   corresponding value is changed in the smartphone phyphox. 
   The P to A  communication is manifested by blinking 
   of the builtin led.
*/
#include <phyphoxBle.h> 

float myFloatArduino; // variable to be received

void setup() {
  // put your setup code here, to run once:

  PhyphoxBLE::start(); //Start the BLE server
  // Initialize the variable transfer when the corresponding
  // value is changed in the smartphone phyphox
  PhyphoxBLE::configHandler = &PtoAcommunication; // !!
  
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  
  Serial.begin(9600);
  // blocks the program untill opening of the Serial Monitor.
  while (!Serial); 
} // end setup

void loop() {
  // put your main code here, to run repeatedly:
  delay(2000);
  // Serial.print("myFloat = ");
  // Serial.println(myFloatArduino);  
}

void PtoAcommunication(){
  int i;
  for(i=0; i<5; i++) {
    digitalWrite(LED_BUILTIN, HIGH);
    delay(100);
    digitalWrite(LED_BUILTIN, LOW);
    delay(300);
  }
  PhyphoxBLE::read(myFloatArduino);
  Serial.print("myFloat = ");
  Serial.println(myFloatArduino);
  /* Printing and blinking all the time even when
   * the value is not changed in the smartphone !!??? 
   */
}