  Stand-alone functions additional to a UAV flight-controller, such as
safety-relevant flight-path monitoring or payload-monitoring and control, may
be SORA-required or advised for specific flight paths of delivery-drones. These
functions, articulated as discrete electronic components either internal or
external to the main fuselage, can be networked with other on-board electronics
systems. Such an integration requires respecting the integrity levels of each
component on the network both in terms of function and in terms of
power-supply. In this body of work we detail an intra-component communication
system for small autonomous and semi-autonomous unmanned aerial vehicles
(UAVs.) We discuss the context and the (conservative) design decisions before
detailing the hardware and software interfaces and reporting on a first
implementation. We finish by drawing conclusions and proposing future work.
