Non-printable character hex in commands

You use enter non-printable ASCII characters (like a Carriage-Return, 0x0D) in the following commands:
 * TCP (data)
 * UDP (data)
 * Serial (data and readUntil)

Do so by using the following form: e.g. {0x0D} In the rare occasion that you would want to use {0x0D} in your command without converting it, you can escape it by putting a \ as prefix.