Consider a rover arriving at a charging station. It must find the station, establish that a connection is possible, exchange the information needed to charge, and leave ready for its next task. Each action crosses an interface. The complete sequence is the useful unit of design.
Start with one exchange.
The charging connection involves mechanics, power, controls and data. Dust can affect the connector. Electrical protection matters on both sides. The rover and station need a shared understanding of readiness, permitted power and interruption. Matching a plug is only one part of making that exchange work.
Start with the user's action, then identify the equipment, messages and conditions required to complete it. This keeps interface work tied to an operating purpose. It also makes responsibility visible: which system detects a fault, which stops delivery, and which confirms that it is safe to resume?
Name the profile.
A common specification can contain several services, optional functions and requirements that apply only to particular roles. Two systems can reference the same document while implementing different parts of it. A useful interface agreement identifies the edition, the selected service, the supported behavior and any unresolved requirements.
LunaNet takes a service-based approach to communications and navigation interfaces. A provider can offer a subset of services. Real-time delivery and store-and-forward delivery have different expectations, and a timing reference is not the same as a complete navigation solution. Power and thermal interfaces need their own definitions alongside the network connection.
Keep the connection testable.
An interface becomes more useful when its behavior can be exercised before the full mission exists. A fixture, emulator or recorded exchange can test a defined configuration through normal operation, interruptions and recovery. Results need to stay tied to the hardware, software and interface revision that produced them.
That is how independent development can support a wider system. One team can improve its equipment while preserving the exchanges others depend on. Changes become questions that can be inspected and tested. For Constanellis, this connects manufacturing and qualification to the control and infrastructure we are developing: each part needs a clear way to work with the next.