README says what the module adds to Ground Control's library and what it
works around, and how to use it. JSPR.md is the protocol as the library
speaks it, from its source, with its surprises. CLOUDLOOP.md is account
to first message, from WII6's IRIDIUM.md. TESTING.md is the levels, the
rig, and what has passed: Python, native_sim, an ESP32-S3 and an STM32U5
against the fake, and free checks against a real 9704.
