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This hook is intended to initiate a new node joining the network of
peers. We could in theory also omit the in-scope test and use a
normal broadcast to join. Using a different channal however provides
a basic level of security. A possibe implementation is below. The
first fragment is a hook added to the server, the second is a
predicate added to a client and the last initiates the request in
the client. The excanged term (
join(X)) can be used to exchange a
:- multifile udp_broadcast:udp_unicast_join_hook/3. udp_broadcast:udp_unicast_join_hook(Scope, From, join(welcome)) :- udp_peer_add(Scope, From),
join_request(Scope, Address, Reply) :- udp_peer_add(Scope, Address), broadcast_request(udp(Scope, join(X))).
?- join_request(myscope, "220.127.116.11":10001, Reply). Reply = welcome.