update readme

README.md

@@ -102,7 +102,10 @@ Prerequisites:
 
 ##### Instructions
 1) Download the latest [dirigera-client-dump.jar](https://github.com/dvdgeisler/DirigeraClient/releases)
-2) Run `java -jar dirigira-client-dump.jar --dirigera.hostname=<ip address of DIRIGERA Gateway>`
+2) Run `java -jar dirigira-client-dump.jar`</br>
+   If the autodiscovery fails and no DIRIGERA is found in your Network, you may pass the DIRIGERA's connection details 
+   by the parameters `--dirigera.hostname=<ip address of DIRIGERA Gateway>` and
+   `--dirigera.port=8443`.
 
 ## Integration to Home Assistant