22 lines
788 B
JavaScript
22 lines
788 B
JavaScript
/**
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* @param {object} options
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* @param {number=} options.timestamp
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* @param {number=} options.deviceId
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* @param {number=} options.payloadLength
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* @param {number=} options.unknown
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* @returns {Buffer}
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*/
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function createMiioHeader(options = {}) {
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const headerLength = 32;
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const header = Buffer.alloc(headerLength, 0xff);
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header[0] = 0x21;
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header[1] = 0x31;
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header.writeUInt16BE((options.payloadLength ?? 0) + headerLength, 2);
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header.writeUInt32BE(options.unknown !== undefined ? options.unknown : 0xffffffff, 4);
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header.writeUInt32BE(options.deviceId !== undefined ? options.deviceId : 0xffffffff, 8);
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header.writeUInt32BE(options.timestamp !== undefined ? options.timestamp : 0xffffffff, 12);
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return header;
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}
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module.exports = createMiioHeader;
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