how to send notification to another device when one device is less than 1km

There is a requirement like a bus driver of a school having mobile device and i want to trigger notification when bus driver device is 1km less than parents home for eg  pick up your child as message. Is it possible in outsytems and How we can do it.

Hi Aayush,

Adding more to Rahul's reply you need to to look for a a gps plugin with realtime location and a realtime DB like functionality also for tracking the bus and a distance api to calculate the distance between the two points you get from location plugin. And for notification you should use firebase mobile plugin suggested in Rahul's reply, it is very easy to use and understand.