Rademacher offers a free service that allows you to operate the HomePilot or Bridge even when you are not at home.
This service is called WR Connect.
You create your free user account on this server and use it to operate the HomePilot app.
The HomePilot or the bridge do not necessarily have to be registered. If you only want to operate your devices when you are at home, no registration is necessary.
When using voice controls via Amazon Alexa or Google Assistant, the corresponding accounts are simply linked.
Note: The HomePilot app automatically detects if a connection in the local network is possible and will always prefer it. You can control the current connection by selecting Settings > App Settings > Current Device.