Added SingleFunctionLighting (0x02, 0x91)

[xen2]

Add support SingleFunctionLighting (as used by Advance Link Plus Wireless adapter WTY2001).

Note: in practice, when changing two lights very quickly (sending two message for change before first message came back), it seems setMessage returns false. https://github.com/scottyphillips/pychonet/blob/master/pychonet/EchonetInstance.py#L66

I could think of several options to fix it:

1. For/While loop with retry count inside setMessage in pychonet
2. For/While loop with retry count on echonetlite_homeassistant side
3. Add a lock inside setMessage (I am not sure about the exact scope for such a lock, is it a limitation per host/system in which case the lock should be per host/system? is it only for this specific hardware device WTY2001 or a general ECHONET lite restriction?)

For now I did the fix 1, and it works fine. I think I saw you did a similar fix for getting property map already?

[nao-pon]

@xen2 If you manipulate two lights quickly, does the state of the device match the content of the response? If it matches, there is a high possibility that it is a limitation of the device specifications.

Incorporating a retry function will cause a drop in response in the event of a true error, so careful consideration is required.

[nao-pon]

After carefully reading the ECHONET Lite specifications, it states that when making consecutive requests to a device, wait for a response before making the next request. It seems that the controller design should conform to that.

[nao-pon]

@xen2 I'm working on a fix for a problem with making back-to-back requests. Could you try the modified code for #58?

• https://github.com/nao-pon/pychonet/blob/single_request/pychonet/echonetapiclient.py