@squawk
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    Interface ModeAcReply

    Decoded Mode A/C reply. Mode A/C predates Mode-S and carries no ICAO address - there is nothing here that identifies which aircraft sent it, only the squawk code and (if the reply looks like a valid altitude report) an altitude.

    interface ModeAcReply {
        altitudeFt: number | undefined;
        identActive: boolean;
        kind: "modeAc";
        squawk: string;
    }
    Index
    altitudeFt identActive kind squawk
    altitudeFt: number | undefined

    Altitude in feet, if the reply decodes as a valid Mode C altitude report. Undefined for a Mode A (identity-only) reply or an invalid code.

    identActive: boolean

    True if the Ident (SPI - Special Position Identification) pulse is set.

    kind: "modeAc"
    squawk: string

    4-digit octal squawk code, e.g. "1200".

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