Added buttons for controlling pool equipment

This can be used with a touch screen, for example. I've also stubbed in functionality for controlling lights, heaters, and heat setpoints, but no actual UI exists for anything other than turning circuits on and off for now. That stuff is coming soon.

node_helper.js

@@ -12,6 +12,13 @@ module.exports = NodeHelper.create({
 		});
 	},
 
+	setCircuit: function(circuitState) {
+		var self = this;
+		setCircuitState(circuitState, function(done) {
+			self.sendSocketNotification('SCREENLOGIC_CIRCUIT_DONE', circuitState);
+		});
+	},
+
 	setTimer: function(updateInterval) {
 		var update = true;
 		update = typeof this.updateInterval === 'undefined' || this.updateInterval != updateInterval;
@@ -37,16 +44,33 @@ module.exports = NodeHelper.create({
 		if (notification === 'SCREENLOGIC_UPDATE') {
 			this.doUpdate();
 		}
+		if (notification === 'SCREENLOGIC_CIRCUIT') {
+			this.setCircuit(payload);
+		}
+		if (notification === 'SCREENLOGIC_HEATPOINT') {
+			this.setHeatpoint(payload);
+		}
+		if (notification === 'SCREENLOGIC_HEATSTATE') {
+			this.setHeatstate(payload);
+		}
+		if (notification === 'SCREENLOGIC_LIGHTCMD') {
+			this.setLightcmd(payload);
+		}
 	}
 });
 
 const ScreenLogic = require('node-screenlogic');
+var foundUnit;
 
 function getPoolData(config, cb) {
-	if (typeof config === 'undefined' || !config.serverAddress || !config.serverPort) {
-		findServer(cb);
+	if (!foundUnit && typeof config !== 'undefined' && config.serverAddress && config.serverPort) {
+		foundUnit = new ScreenLogic.UnitConnection(config.serverPort, config.serverAddress);
+	}
+
+	if (foundUnit) {
+		populateSystemData(cb);
 	} else {
-		populateSystemData(new ScreenLogic.UnitConnection(config.serverPort, config.serverAddress), cb);
+		findServer(cb);
 	}
 }
 
@@ -54,26 +78,50 @@ function findServer(cb) {
 	var finder = new ScreenLogic.FindUnits();
 	finder.on('serverFound', function(server) {
 		finder.close();
-		populateSystemData(new ScreenLogic.UnitConnection(server), cb);
+
+		foundUnit = new ScreenLogic.UnitConnection(server);
+		populateSystemData(cb);
 	});
 
 	finder.search();
 }
 
-function populateSystemData(unit, cb) {
+function populateSystemData(cb) {
 	var poolData = {};
 
-	unit.on('loggedIn', function() {
-		unit.getControllerConfig();
-	}).on('controllerConfig', function(config) {
+	if (!foundUnit) {
+		cb(poolData);
+		return;
+	}
+
+	foundUnit.once('loggedIn', function() {
+		foundUnit.getControllerConfig();
+	}).once('controllerConfig', function(config) {
+		poolData.controllerConfig = config;
 		poolData.degStr = config.degC ? 'C' : 'F';
-		unit.getPoolStatus();
-	}).on('poolStatus', function(status) {
+		foundUnit.getPoolStatus();
+	}).once('poolStatus', function(status) {
 		poolData.status = status;
 
-		unit.close();
+		foundUnit.close();
 		cb(poolData);
 	});
 
-	unit.connect();
+	foundUnit.connect();
+}
+
+function setCircuitState(circuitState, cb) {
+	if (!foundUnit) {
+		cb();
+		return;
+	}
+
+	foundUnit.once('loggedIn', function() {
+		foundUnit.setCircuitState(0, circuitState.id, circuitState.state);
+	}).once('circuitStateChanged', function() {
+		foundUnit.close();
+		cb(true);
+	});
+
+	foundUnit.connect();
 }