Merge pull request #178 from s0meone/singleton

Make sure only one instance is started

Author: ekarak

lib/openzwave-shared.js

@@ -27,4 +27,8 @@ for (var k in EventEmitter.prototype) {
   addonModule.Emitter.prototype[k] = EventEmitter.prototype[k];
 }
 
-module.exports = addonModule.Emitter;
+var instance;
+module.exports = function(options) {
+  if (!instance) instance = new addonModule.Emitter(options);
+  return instance;
+}