Fix missing '[ ]' when convert IPv6 address to URI.

leshan-lwm2m-core/src/main/java/org/eclipse/leshan/core/endpoint/DefaultEndPointUriHandler.java

@@ -105,6 +105,7 @@ protected static String toUriHostName(InetSocketAddress socketAddr) {
                     host = hostAddress + separator + scope;
                 }
             }
+            host = '[' + host + ']';
         }
         return host;
     }