static byte[] generateOOBAlphaNumeric(final int oobSize) {
        final Random random = new Random();
        final byte[] value = new byte[oobSize];
        for (int i = 0; i < oobSize; i++) {
            final int index = random.nextInt(ALPHANUMERIC.length);
            value[i] = ALPHANUMERIC[index];
        }
        MeshLogger.verbose(TAG, "Random OOB alpha numeric: " + new String(value));
        return value;
    }
Generates a random alphanumeric code to be entered on the device

<p>
Based on mesh profile specification v1.0.1 section 5.4.2.4 page 254
</p>

@param oobSize oob size
mesh/src/main/java/no/nordicsemi/android/mesh/utils/MeshParserUtils.java