TOY protocol description

toy-protocol.text

Messages begin with one octet of message tag.

Primitives
==========
sized-string: one octet of size followed by that many printable low-ascii characters

Client -> Server
================
0x3F: HELLO
Payload: username :: sized-string
Meaning: Register connection with human-readable user-name, required to be allowed to send and receive chat.

0x3E: I-SAY
Payload: chatmessage :: sized-string
Meaning: Message to broadcast to everyone, excluding client.

Server -> Client
================
0x3C: HE-SAID
Payload: username :: sized-string
         chatmessage :: sized-string
Meaning: Message from another user.

Additional semantics
====================
When an user attempts to send a message without being registered, disconnect him.