struct t_MyStruct {
  int varA;
  float varB;
  float varC;
};

void myFunc_1(int param1, t_MyStruct param2){
  Serial.println("=================================");
  Serial.println("param1: " + String(param1));
  Serial.println(
    "param2 varA: " + String(param2.varA) + ", "
    + "varB: " + String(param2.varB) + ", "
    + "varC: " + String(param2.varC)
  );
}

void myFunc_2(int param1, t_MyStruct *param2){
  Serial.println("===== USING REFERENCE =========");
  Serial.println("param1: " + String(param1));
  Serial.println(
    "param2 varA: " + String(param2->varA) + ", "
    + "varB: " + String(param2->varB) + ", "
    + "varC: " + String(param2->varC)
  );
}

t_MyStruct& createStruct(){
  static t_MyStruct myStruct;   //MUST BE STATIC TO PERSISTS
  myStruct.varA = 100;
  myStruct.varB = 100.1;
  myStruct.varC = 100.2;

  return myStruct;
}

t_MyStruct wire_struct;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  wire_struct = createStruct();
}

void loop() {
  // put your main code here, to run repeatedly:

  t_MyStruct varStruct_1 = {22, 12.3, 11.3};
  myFunc_1(42, varStruct_1);

  t_MyStruct *varStruct_2;
  varStruct_2 = new t_MyStruct({22, 12.3});
  /*
  varStruct_2->varA = 99;
  varStruct_2->varB = 11.1;
  varStruct_2->varC = 22.2;
  */
  myFunc_2(81, varStruct_2);

  myFunc_1(99, wire_struct);

  delay(1000);
}