alerts network

It is an application where a user can select one type of event among several or a generic event to which they can add images, audio, video or text.
Once the event is published, the notification groups of that user will be notified.
Users will not be able to agree to participate in the event and monitor the event and the users who participate in it, who will update their location in real time, being able to add content and participate in a general chat.
In this map you will not only see the location of the users who participate in it, which may be indicated as people, but also as different types of vehicles with movement animation.
The user who created the event must enter the location of the event and will be able to establish if the event happens where him.
Users who participate in the event will be able to notify the rest of the users of actions taken in attendance.
The database engine must be Firebase Realtime Database, Firestore, or another technology that competes with them on price and effectiveness.
The application must consider that a group of users update their location in real time with the lowest energy consumption. Other users will not constantly update their location and will only do so when creating an event or entering news
It is desirable that the application, even in the background, allows the press of a bluetooth button to bring the application to the foreground and trigger a specific event.
From the server side, the control of the user's status must be carried out according to the explanations that will be provided to the chosen company.

Required platforms: Ios, Android