MDP clients can now request the set of local addresses.
Framework is improved to avoid info leaks by sending more bytes
in an MDP frame than are necessary, but without having to bzero
almost 2KB each time.
Broadcast and unicast addresses are accepted. Some frame headers
are set. Payload is yet to be set, and ciphered &/or signed as required,
and queueing is not yet verified.
messages now works. Server currently reports error when trying to
send MDP_TX frames (since it is not yet implemented), which the
client successfully displays. Onto making the server handle the
MDP_TX frames.
delete server socket if you are a client). Also added main MDP
ping loop of sending packets. Reading returned packets not yet
implemented. Server handling of MDP_TX packets also not yet
implemented.
Added framework for MDP ping, and some work towards MDP port binding
and sending packets with option to wait for reply. MDP server
doesn't yet support port binding, and client doesn't yet support
reading replies.
