Add DPT232

[greiginsydney]

Hi Michael,

This PR adds encoding and decoding of DPT 232.

I've never written unit tests before, but I think what I've done is valid:

pi@captureKNX-Tijl:~/tests/knxdclient $ python3 -m unittest
..Send request
Send request
.Send request
Send request
..Error while waiting for next packet from KNXd: TimeoutError(). Exiting from receive loop.
........................
----------------------------------------------------------------------
Ran 29 tests in 2.922s

OK
pi@captureKNX-Tijl:~/tests/knxdclient $

Let me know if anything's not quite right and I'll amend as required.

If you're OK with it I'll add more DPTs as users of my captureKNX bring them to my attention??

Thanks.

- Greig.

[mhthies]

Hi Greig,

thanks for your contribution! Of course, I'm happy to add more KNX DPTs! Until now I've been lazy and only added the few DPTs needed for the KNX devices at my parents' home.

However, please take a look at my comments about the Python types returned/accepted by the decode/encode functions. I'd like to keep them as consistent and semantically fitting as possible.

[mhthies]

You could add a "roundtrip" test here that checks that decode_value(encode_value(some_value, ...), ...) == some_value.

This should also reveal the issue with the deviating datatypes, discussed in my other comments.

[greiginsydney]

Ta. I shall tinker. (This first one might take us a little while, but it should speed any future ones. I appreciate the hand-holding).

[greiginsydney]

Thanks Michael. I'll get onto these. (Sorry for the slow response - I didn't receive any notification from GitHub that you'd responded).