[Twisted-Python] Guidance needed on serial device interaction

[Michael Thompson]

On 2 February 2011 10:11, Jason Heeris <jason.heeris at gmail.com> wrote:
> On 2 February 2011 17:53, Albert Brandl <albert.brandl at weiermayer.com> wrote:
>> "string" could be interpreted as "complete message". It might e.g. happen
>> that a message arrives in three chunks. Each time a chunk is read, the
>> dataReceived method is called. When it detects that the message is
>> complete, it calls stringReceived with the content of the message.
>
> Okay, but I don't see how to use that to solve my particular problem.
> I'm not waiting passively to receive a complete string, I have to
> react to whatever's sent back, character by character, either by
> reporting completion, an error or sending more data. In effect, I
> guess, each character is a "complete message" anyway. I don't think
> the t.i.protocols offer much for that.

Yep you have a pretty simple protocol there so even the basic examples
are probably more than you need.

Something like this might get you started.

class MyProtocol(Protocol):
    def send(self, byte):
          self.transport.write(byte)
          self.response = Deferred()
          return self.response

    def dataReceived(self, byte):
           self.response.callback(byte)