I want to make a ‘chat’ between two clients using gRPC.
The first scheme of ‘communicating’ between clients is:

1. client1 connects to server (may be sends client1_login)
2. client2 connects to server
3. client1 wants to make a chat room with client2, so it sends to server client2_login (and may be another properties, for example, client1_login)
4. server sends both to client1 and client2 configs for connecting to chat room

The second scheme is when 2 clients must exchange information:

1. client1 sends data
2. data must be passed to client2

How can I make this in Java with gRPC?