PROTOCOL

all numbers are packed unless stated otherwise
packed values are msb

strings are predefined sizes and are terminated at the
first NUL character (0x0). max string length is the region
length minus one, for the required NUL.

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: clerical request
        r.0 - clerical id - byte
       
    id 1: alert prompt response
        r.0 - clerical id - byte
        r.1 - prompt id   - byte
       
    id 2: boolean prompt response
        r.0 - clerical id - byte
        r.1 - prompt id   - byte
        r.2 - response    - bool
        
    id 3: string prompt response
        r.0 - clerical id - byte
        r.1 - prompt id   - byte
        r.2 - response    - string (256b)
        
    id 4: list prompt response
        r.0 - clerical id - byte
        r.1 - prompt id   - byte
        r.2 - response    - ushort
       
    id 5: ctx change response
        r.0 - ack    - bool
        r.1 - ctx id - ushort
    
--- 
   
server -> client
    id 0: clerical response
        r.0 - clerical id - byte
        r.1 - success     - bool
    
    id 1: alert prompt
        r.0 - clerical id  - byte
        r.1 - prompt id    - byte
        r.2 - prompt width - ushort
        r.3 - text         - string (512b)
    
    id 2: boolean prompt
        r.0 - clerical id  - byte
        r.1 - prompt id    - byte
        r.2 - prompt width - ushort
        r.3 - text         - string (512b)
    
    id 3: string prompt
        r.0 - clerical id  - byte
        r.1 - prompt id    - byte
        r.2 - prompt width - ushort
        r.3 - text         - string (512b)
        r.4 - strlen       - byte
    
    id 4: list prompt
        r.0   - clerical id      - byte
        r.1   - prompt id        - byte
        r.2   - prompt width     - ushort
        r.3   - text             - string (512b)
        r.4   - option count - n - ushort
        r.x | 4 < x <= 4+n 
              - option text      - string (256b)
        
    id 5: ctx change request
        r.0 - ctx id - ushort
        
---

CLERICAL IDs
    id 0: register
    id 1: login