Type-Length-Value
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Type-Length-Value (TLV) is a form of encoding that generally conforms to the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type 8-bit identifier of the type of option. The
value in the Type field is context dependent.
Length 8-bit unsigned integer. The length of the option
(including the type and length fields) in units of
8 octets.
A Length value of 0 is often either invalid or
indicates a minimum value of, for example, 64bits.
Value This is a variable length field (as specified in
the Length field) containing context-specific
values.