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Interested

A peer is "interested" in another peer when it wants to request blocks of file data.  If we are interested in the remote peer, it might unchoke us and then we can send some requests.

A peer can indicate to the remote peer that it is interested by sending message type 2 (one byte).

A peer can indicate to the remote peer that it is NOT interested by sending message type 3 (one byte).

These messages are only a single byte for the type, there is no other data.