send push notification in android from device to another

Question

I am working on a cab booking app . I am developping two applications the first one is B2C side (for the client who 's going to book a taxi) and B2U side (for the driver of the taxi).I need when a client make a reservation and the taxi driver accept it ,can both communicate with each other by sending notifications for example :the driver can send to the client "i am about to arrive " etc and vice versa . I need a simple way to do this apart of GCM because it's not totally free .I need an easy way without the need of developping a web service and make my own server .

Answer 1

If you want to make your own server then go with socket programming. And implement your own push notification.But you don't have mention your server side platform so I am unable to provide exact implementation reference.