# Respond to pending discovery requests by sending the TCP listening address and port
	#
	# Returns the number of valid requests received.
	#
	# The response messages includes the TCP listening address and port
	# for remote clients to connect with TCP using `connect`.
	# These connections are accepted by the server with `accept_clients`.
	fun answer_discovery_requests: Int
	do
		var count = 0
		loop
			var ptr = new Ref[nullable SocketAddress](null)
			var read = discovery_socket.recv_from(1024, ptr)

			# No sender means there is no discovery request
			var sender = ptr.item
			if sender == null then break

			var words = read.split(" ")
			if words.length != 2 or words[0] != discovery_request_message or words[1] != handshake_app_name then
				print "Server Warning: Rejected discovery request '{read}' from {sender.address}:{sender.port}"
				continue
			end

			var msg = "{discovery_response_message} {handshake_app_name} {self.port}"
			discovery_socket.send_to(sender.address, sender.port, msg)
			count += 1
		end
		return count
	end