build a database to help a procces of a school exit

the main idea is develop a list of fathers that come to a school to pick up their children. is a 200 meter internal way from the main door to the school to the place to pick up the student. if the parent have an app to send the data when he arrive the school, the procces to pick up their children can be faster and secure. the information can be sended to a voice speaker to call the student and leave the list whet the parent leave the school. everything using the mac address of their cellular phone.