CCSDS — Consultative Committee for Space Data Systems

CCSDS is the international standards body for spacecraft data systems, founded by the major space agencies and publishing the recommendations that let a ground station operated by one agency communicate with a spacecraft built by another. It covers telemetry and telecommand framing, file delivery, time correlation, mission operations services and Space Link Extension — the deepest formal interoperability tradition in any market API Evangelist measures, and one written almost entirely for machine-to-machine links rather than for public interfaces.