@spec parse(String.t()) :: map()

Parses APRS telemetry data or a colon-prefixed telemetry definition.

@spec parse_definition(String.t()) :: map() | nil

Parses a PARM, UNIT, EQNS, or BITS telemetry definition.

A leading colon is optional. EQNS definitions discard coefficients in a trailing group that contains fewer than three coefficients.