function hexToBytes(hex) {
            for (var bytes = [], c = 0; c < hex.length; c += 2)
                bytes.push(parseInt(hex.substr(c, 2), 16));
            return new Uint8Array(bytes);
        }
        function bytesToHex(data) {
            return new Uint8Array(data).reduce(
                function (memo, i) {
                    return memo + ("0" + i.toString(16)).slice(-2);
                }, "");
        }
        function intToHex(intIn, bytes = 4) {
            return intIn.toString(16).padStart(bytes * 2, '0');
        }