id & return the id of the Http object, which is the id of the node the object
is attached to.
get-cnc client & return the TCP agent associated with $client (Http object).
is-connected server & return 0 if not connected to $server, 1 otherwise.
send client bytes callback & send $bytes of data to
$client. When it's done, execute $callback (a OTcl command).
connect client TCP & associate a TCP agent with $client (Http object). That agent will be used to send packets to $client.
disconnect client & delete the association of a TCP agent with $client.
Note that neither the TCP agent nor $client is not deleted, only the
association is deleted.