HomeKit Create Setup Payload String

Targets macOS
1

Does anybody know how I can create a method for create a “Setup Payload” string for HomeKit (Especially the bold, italicized parts)?

This is an example c-source code:

export const CATEGORIES = new Map([
[‘other’, 1],
[‘bridge’, 2],
[‘fan’, 3],
[‘garage’, 4],
[‘lightbulb’, 5],
[‘doorLock’, 6],
[‘outlet’, 7],
[‘switch’, 8],
[‘thermostat’, 9],
[‘sensor’, 10],
[‘securitySystem’, 11],
[‘door’, 12],
[‘window’, 13],
[‘windowCovering’, 14],
[‘programmableSwitch’, 15],
[‘rangeExtender’, 16],
[‘ipCamera’, 17],
[‘videoDoorBell’, 18],
[‘airPurifier’, 19],
[‘heater’, 20],
[‘airConditioner’, 21],
[‘humidifier’, 22],
[‘dehumidifier’, 23],
[‘appleTv’, 24],
[‘speaker’, 26],
[‘airport’, 27],
[‘sprinkler’, 28],
[‘faucet’, 29],
[‘showerHead’, 30],
[‘television’, 31],
[‘targetController’, 32],
]);
export const createSetupUri = (
category: number,
password: string,
setupId: string,
version = 0,
reserved = 0,
flags = 2,
): string => {
let payload: bigint | number = 0;
payload = payload | (version & 0x7);

payload = payload << 4;
> payload = payload | (reserved & 0xf); // reserved bits

payload = payload << 8;
> payload = payload | (category & 0xff);

payload = payload << 4;
> payload = payload | (flags & 0xf);

payload = BigInt(payload) << BigInt(27);
> payload = BigInt(payload) | BigInt(Number(password) & 0x7fffffff);

const payloadBase36 = payload.toString(36).toUpperCase().padStart(9, ‘0’);

return X-HM://${payloadBase36}${setupId};
};

This example creates a “Setup Payload” string like this:
X-HM://00J08JMPD1KMP

2

You could accomplish this with a Memoryblock or with a UInt64 and the Bitwise class methods.