Add public and private SSE notifications to a laravel 11 app

Hi developers,

I am developing a website using laravel 11 and would like to add to it the capability to send server-to-browser real time notifications or updates based on certain events.

The server sent event (sse) should, as much as possible, follow these criteria:

1- be based on laravel's real-time mechanisms (event broadcasting, controllers, redis, etc).
2- Public message to be sent to all authenticated users.
3- Private messages to be sent to users based on their $id.
4- The connection should be persistent, re-connects itself if it gets lost for any reason.
5- Favor "ShouldBroadcast" over "ShouldQueue", a worker should dispatch notifications every 60 seconds.
6- The front-end script to display a flash message upon message reception showing the message text.
7- No addition of livewire, alpine, vuejs, react or anything not strictly needed for SSE to work.
8- MOST importantly, the SSE structure should be robust enough to handle 30000 connected users. This includes (only if absolutely necessary) fine tuning nginx and php config settings.

To facilitate working on the project, and since I am using sqlite, I wrapped the whole thing in *.rar that can be downloaded from this link:

https://srv866294.hstgr.cloud/storage/sse.rar

The login page as well as the form to send notifications are already populated with existing users so that you can pick from when you login or after login, test public or private messages. The landing page form (which appears after login) to be used to simulate event triggering. I attach below some pics to give you an idea how it should look like.

Final note: the form in the landing page simulates event triggering by posting the variables to a controller, which would then use "event(new", "broadcast(new" or any applicable method.

Best regards
Miron