How to use the net-keepalive.setKeepAliveInterval function in net-keepalive

var client = net.connect(options, function () {
		var header =	'GET /ISAPI/Event/notification/alertStream HTTP/1.1\r\n' +
				'Host: ' + options.host + ':' + options.port + '\r\n' +
				authHeader + '\r\n' + 
				'Accept: multipart/x-mixed-replace\r\n\r\n';
		client.write(header)
		client.setKeepAlive(true,1000)
		NetKeepAlive.setKeepAliveInterval(client,5000)	// sets TCP_KEEPINTVL to 5s
		NetKeepAlive.setKeepAliveProbes(client, 12)	// 60s and kill the connection.
        	handleConnection(self, options);
	});

this.socket = tls.connect(options, function () {
            this.log('Connected');

            this.socket.setKeepAlive(this.keepAliveConfig.enabled, this.keepAliveConfig.initial_delay);
            keepAlive.setKeepAliveInterval(this.socket, this.keepAliveConfig.interval);
            keepAlive.setKeepAliveProbes(this.socket, this.keepAliveConfig.probes);

            // All responses from AC are received here as lines
            carrier.carry(this.socket, this._readLine.bind(this));
        }.bind(this));