PROTOCOL

all numbers are packed unless stated otherwise
packed values are msb

strings and blobs are prefixed with a packed ushort length

byte n is b.n
region n is r.n

---

byte the zero: 0xDE
byte the one: 0xAD
byte the two: packet id
byte the 3-6: total body length - uint

byte the bytes after the header octet bytes bytes:
    raw body data shoved next to each other with no separation

---    

client -> server
    id 0: registration attempt
        r.0 - username - string
        r.1 - pin      - ushort (max 9999)
       
    id 1: login attempt
        r.0 - username - string
        r.1 - pin      - ushort (max 9999)
       
    id 2: ctx change response
        r.0 - ack    - bool
        r.1 - ctx id - ushort
    
--- 
   
server -> client
    id 0: registration response
        r.0 - succeeded - bool
        r.1 - status    - string
    
    id 1: login response
        r.0 -  succeeded - bool
        r.1 -> status    - string (if r.0 false)
            -> user id   - ushort (if r.0 true)
        
    id 2: ctx change request
        r.0 - ctx id - ushort