How to decode the double precision floating point packet? about sensordecoders HOT 1 CLOSED

/**
 * Sign: 1
 * Exponent: 5, offset 15
 * Mantissa: 10
 */
function readFloat16LE(bytes) {
    var bits = (bytes[1] << 8) | bytes[0];
    var sign = bits >>> 15 === 0 ? 1.0 : -1.0;
    var e = (bits >>> 10) & 0x1f;
    var m = e === 0 ? (bits & 0x3ff) << 1 : (bits & 0x3ff) | 0x400;
    var f = sign * m * Math.pow(2, e - 25);
    return f;
}

/**
 * Sign: 1
 * Exponent: 8, offset 127
 * Mantissa: 23
 */
function readFloat32LE(bytes) {
    var bits = (bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | bytes[0];
    var sign = bits >>> 31 === 0 ? 1.0 : -1.0;
    var e = (bits >>> 23) & 0xff;
    var m = e === 0 ? (bits & 0x7fffff) << 1 : (bits & 0x7fffff) | 0x800000;
    var f = sign * m * Math.pow(2, e - 150);
    return f;
}

/**
 * Sign: 1
 * Exponent: 11, offset 1023
 * Mantissa: 52
 */
function readFloat64LE(bytes) {
    var lowBits = (bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | bytes[0];
    var highBits = (bytes[7] << 24) | (bytes[6] << 16) | (bytes[5] << 8) | bytes[4];
    
    var sign = highBits >>> 31 === 0 ? 1.0 : -1.0;
    var e = (highBits >>> 20) & 0x7ff;
    var m = e === 0 ? 
        (highBits & 0xfffff) * Math.pow(2, 32) + lowBits :
        (highBits & 0xfffff) * Math.pow(2, 32) + lowBits + Math.pow(2, 52);
    
    var f = sign * m * Math.pow(2, e - 1075);
    return f;
}