Reverse-engineered from Clayton Smith's gr-elster project and real
captures posted in the issue thread. FSK Manchester-encoded, whitened
with 0x55, CRC-16/X-25 protected. Disabled by default pending wider
field-testing; the protocol is only partially reverse-engineered
(the hourly-usage sub-command decode is a port of the reference
implementation, not independently confirmed against a real capture).
Source: https://github.com/merbanan/rtl_433/issues/1196
8f6050c4dc