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1this is the relevant part of the spec
2"Messages from client to server
3
4Numbers in all messages must be in network byte order. All messages from the client to the server have this format:
5
6    Bytes 0-3: A 4-byte unsigned integer containing SecretKey.
7    Bytes 4-5: A 2-byte unsigned integer (a short) containing the type of request: set (0), get (1), digest (2), run (3).
8    Bytes 6-7: Two bytes of padding, with arbitrary values. 
9
10The remainder of the bytes are command-specific.
11
12    Set request
13        Bytes 8-23: a null-terminated variable name, no longer than 15 characters.
14        Bytes 24-25: A 2-byte unsigned integer (short) giving the length of the value, which must not exceed 100, including the concluding null (for a string value).
15        Bytes 26 ..: The value itself. The client need not send any more than the number of bytes required. 
16    Get request
17        Bytes 8-23: a null-terminated variable name, no longer than 15 characters. 
18    Digest request
19        Bytes 8-9: a 2-byte unsigned integer (short) giving the length of the value, which must not exceed 100.
20        Bytes 10 ...: The value itself. The client need not send any more than the number of bytes required. 
21    Run request (extra credit)
22        Byte 8-15: an 8-byte string (null terminated) holding one of the valid values. 
23
24Messages from server to client
25Numbers in all messages must be in network byte order. If a client sends a request with an invalid secret key, the server should close the connection without returning any message at all.
26
27All messages from the server to the client have this format:
28
29    Byte 0: A 1-byte return code: 0 for success, -1 for failure.
30    Bytes 1-3: Three bytes of padding, with arbitrary values. 
31
32The remainder of the bytes are command-specific.
33
34    Set response
35        No further data 
36    Get, Digest, and (extra credit) Run response
37        Bytes 4-5: A 2-byte unsigned integer (short) giving the length of the value, which must not exceed 100, including the concluding null (for a string value).
38        Bytes 6 ..: The value itself. The server need not send any more than the number of bytes required. 
39"