Dart is not printing hex string - flutter

Question

I got the string \x01\x01 from a tcp/ip socket, when I try to print it to console, no output is coming
void main() {
var out = "\x01\x01";
print("printing out as --> $out <--");
final runes = out.runes.toList();
print(runes);
}
It gives the output as
printing out as --> <--
[1, 1]
dart pad link: https://dartpad.dev/?id=854e4479bfec03d7e8fd40621c845567
I tried to use hex package and it gives Non-hex character detected error.
Questions.
How do I print these types of strings to the console?
If some conversion is needed, how do I know data belongs to these type ?
my socket client is like the following
socket.listen(
// handle data from the server
(Uint8List data) async {
var serverResponse = String.fromCharCodes(data);
print('Server: $serverResponse');
final runes = serverResponse.runes.toList();
print(runes);
},
EDIT
The socket server is the x0vnc server, on reading the input with wire shark I can see the server sent 01 01

Answer 1

To display a hexa, you have to escape the characters like this:
var out = '\\x01\\x01';
this will work.

Answer 2

I suspect you have misunderstood what the server is sending.
Given you've not stated the server language I'm going to guess that ` ab = b'\x01\x01' generates a array with two bytes both with the value 1.
If you treat this as an ASCII value then 1 is a non printable character.
As such you need to iterate over the array and convert each byte into a suitable visual format.
This might mean that when you see a 1 you print x01.
Edit:
actually dart will convert an int to a string for you:
void main() {
final bytes = <int>[1, 2, 3];
for (final byte in bytes) {
print(byte.toString());
}
}