Laravel Biosphere is a third-party package for realtime bi-directional communication between a server and a client.
Laravel Reverb is a nice package, however it is not truly bi-directional out of the box. Server can send messages to clients, clients can 'whisper' messages to other clients, however you cannot send a message from a client to a server without some ugly workarounds, such as using an underlying Echo backend, which can (and will) eventually break on backend change.
On the other hand, Biosphere is a true WebSocket solution, supporting sending messages both from a client, and from a server.