Wrap code within a closure function

routes/weather.js

@@ -1,3 +1,5 @@
+( function() {
+
 	// Define regex filters to match against location
 	var http	= require( "http" ),
 		filters = {
@@ -186,6 +188,10 @@ function checkWeatherRestriction( adjustmentValue, weather ) {
 	// adjustment method which is encoded to also carry the watering
 	// restriction and therefore must be decoded
 	exports.getWeather = function( req, res ) {
+
+		// The adjustment method is encoded by the OpenSprinkler firmware and must be
+		// parsed. This allows the adjustment method and the restriction type to both
+		// be saved in the same byte.
 		var adjustmentMethod		= req.params[0] & ~( 1 << 7 ),
 			adjustmentOptions		= req.query.wto,
 			location				= req.query.loc,
@@ -268,4 +274,5 @@ exports.getWeather = function( req, res ) {
 			} );
 	    }
 	};
+} )();