Ping to the client

hello everyone Iā€™m new on Ionic and trying to make an app for ending my studies :slight_smile:
I need to create an app which ping to multiple clients and push a notifications if there is no answer and gives the error code :slight_smile:
also it must be connected to the server :slight_smile:
and finally i need to make a login for the user :slight_smile:
I would like to know what should I learn
and what should I use ?
and if there is any tutorials or documentations