Peek method will return contents of incoming buffer, without
removing it from the buffer. It can be used to check if expected
data is received so it can be read all at once. You can call Peek
method as many times as you like - it will not block wodTelnetDLX in any
way (no matter if Blocking
is set or not).
This method will always return string expression - unlike
Receive method it cannot
return byte arrays.