void setup() {
  Serial.begin(115200);
  
}

void loop() {
  maFonction(new byte[7]{8,9,10,11,12,13,14});
  delay(5000);
}

void maFonction(byte parm[]) {
  Serial.print("Ma fonction, lenght:");Serial.print(strlen(parm));Serial.print(", first: ");Serial.println(parm[0]);
Serial.print(", last: ");Serial.println(parm[6]);
}