Transaction<T> class

The transaction class is an easy way to use the UsbPort class in a more linear way without blocking.

Example

// Create a parser that splits incoming data on endline newline combination ( \r\n)
var c = Transaction.terminated(p.inputStream, Uint8List.fromList([13, 10]));

// Listen asynchronously if you need this:
c.stream.listen((data) {
  print("ASYNC LISTEN $data");
});

var request_1 = Uint8List.fromList([65]);
// Wait two seconds for the answer

Uint8List response_1 = await c.transaction(p, request_1, Duration(seconds: 2));
if (response_1 == null ) {
   print("Failed to get a response.");
}