XMPP and FCM

- MFB Website in progress. Last updated August 2021 -

This project consisted in the backend to communicate mobile applications using push notifications.

One App plays both roles, as a passanger and as a driver depending on the user login.

The flow starts by registering the user in the backend as a passenger or as a driver. Then, when a passenger requests a Taxi, the backend delivers a push notification to all drivers that are not currently driving a passenger.

That App counts with a state diagram that allows each of the Apps to display the proper UI or react to incoming notifications.

Important blocks of this Architecture are:

- The GCM Connection Server accepting downstram messages from the App server (runing on Google App Engine and programmed in Java) and sending them to the Android client (acting as a driver and passenger based on their email)

- The App Server implements the XMPP protocol to communicate with the GCM connection server.

-The Client App (Android) is a GCM-enabled client.