Thus, after this change, the following two alternatives will work, right?

```
./accumulator-server.py 1028 /accumulate on
./accumulator-server.py 1028 /accumulate 10.1.1.1 on
```

Supporting the first one is specially important, due to is the one that we have documented at https://forge.fi-ware.eu/plugins/mediawiki/wiki/fiware/index.php/Publish/Subscribe_Broker_-_Orion_Context_Broker_-_User_and_Programmers_Guide#Starting_accumulator_server_for_the_tutorials