diff --git a/server.js b/server.js
index <HASH>..<HASH> 100644
--- a/server.js
+++ b/server.js
@@ -1971,9 +1971,9 @@ coapPort = coapConfig.port || 5683;
 coapHost = coapConfig.host || 'localhost';
 
 // Passing in null for the host responds to any request on server
-coapServer.listen(coapPort, coapHost, function () {
+// coapServer.listen(coapPort, coapHost, function () {
 // coapServer.listen(coapPort, null, function () {
-// coapServer.listen(coapPort, function () {
+coapServer.listen(coapPort, function () {
   console.log('coap listening at coap://' + coapHost + ':' + coapPort);
 });
testing coap null address change