static byte[] mapPayload(int toConvert) {
	byte[] ret = new byte[4];
	ret[3] = (byte) (toConvert & 0xFF);
	ret[2] = (byte) ((toConvert >> 8) & 0xFF);
	ret[1] = (byte) ((toConvert >> 16) & 0xFF);
	ret[0] = (byte) ((toConvert >> 24) & 0xFF);
	return ret;
}

static int unmapPayload(byte[] payload) {
	return (payload[3] & 0xFF) +
			((payload[2] & 0xFF) << 8) +
			((payload[1] & 0xFF) << 16) +
			((payload[0] & 0xFF) << 24);
}