var onOpen = function() {};
var onClose = function() {};
var onError = function(error) {};
var onMessage = function(data) {};
wsClient.addListener('message', onMessage);
wsClient.addListener('open', onOpen);
wsClient.addListener('error', onError);
wsClient.addListener('close', onClose);
wsClient.removeListener('message', onMessage);
wsClient.removeListener('open', onOpen);
wsClient.removeListener('error', onError);
wsClient.removeListener('close', onClose);