Time zone setting needed

[bnordli]

After connecting this component to my Plejd system, I noticed that the time functions started to behave strangely. I added debug logging and saw this:

2021-06-09 08:09:18 DEBUG (MainThread) [custom_components.plejd.light] Plejd network reports time as '2021-06-09 09:09:20'
2021-06-09 08:09:18 INFO (MainThread) [custom_components.plejd.light] Plejd time delta is 3601 seconds, setting time to '2021-06-09 08:09:18.441121'.

After reconnecting with the app, it resynchronizes the devices and the component logs the following. (I have removed the message details.)

2021-06-09 08:22:04 DEBUG (MainThread) [custom_components.plejd.light] No match for command 'b'001b'' (b'**')
2021-06-09 08:22:04 DEBUG (MainThread) [custom_components.plejd.light] No match for command 'b'001b'' (b'**')
2021-06-09 08:22:04 DEBUG (MainThread) [custom_components.plejd.light] No match for command 'b'0038'' (b'**')
2021-06-09 08:22:04 DEBUG (MainThread) [custom_components.plejd.light] No match for device '00' (b'**')
2021-06-09 08:22:04 DEBUG (MainThread) [custom_components.plejd.light] No match for command 'b'001b'' (b'**')
2021-06-09 08:22:05 DEBUG (MainThread) [custom_components.plejd.light] No match for device '00' (b'**')

..and then of course the component reports again:

2021-06-09 08:25:43 DEBUG (MainThread) [custom_components.plejd.light] Plejd network reports time as '2021-06-09 09:25:46'
2021-06-09 08:25:43 INFO (MainThread) [custom_components.plejd.light] Plejd time delta is 3602 seconds, setting time to '2021-06-09 08:25:43.909139'.

I am at UTC+2, but it looks like Plejd is reporting time in UTC +3 (!). The timers from my app worked correctly before I attached Home Assistant, so at least it is internally consistent.

Suggested solution: If possible, read the time zone information from Plejd, otherwise add a time zone (or offset) setting to the component to avoid setting the wrong clock.

[klali]

Interesting, mine just did the same thing. I guess it might be a conflict with winter/summer time or such.

[bnordli]

It's a little strange, because Swedish/Norwegian summer time is UTC+2 while winter time is UTC+1, so UTC+3 seems like a bug in the Plejd software.

This line fixes the problem for me, at least during summer hours:

n = n + timedelta(minutes=60)

I guess we have to wait some months to see what the Plejd system does during winter time, but I think a config setting (minutes_offset) would be handy for those not wanting to change the code.

[klali]

So for me the current code worked during winter, and now it logs:

2021-06-09 08:06:34 DEBUG (MainThread) [custom_components.plejd.light] Plejd network reports time as '2021-06-09 09:06:33'
2021-06-09 08:06:34 INFO (MainThread) [custom_components.plejd.light] Plejd time delta is 3601 seconds, setting time to '2021-06-09 10:06:34.199084'.

An interesting difference is that my system time runs on UTC, but the offset from plejd time is what's interesting I guess. For me plejd ran on local time during winter, and now 1h after apparently. I'll look into this a bit and try to think of something that doesn't require more settings.. :)

[bnordli]

FYI: After the time zone switch, I didn't need to to anything (!). My Plejd system is still reporting time to be 60 minutes off.

[klali]

Interesting (annoying?).

My system changes to now not be offset at all from swedish winter time. I wonder if it's worth keeping the time code around at all if it's this inconsistent, it's not really needed for anything when you connect it with home assistant anyways.

[bnordli]

(It's not annoying to me, as I can keep the offset at +60 mins throughout the year.) I would like to keep the time syncing feature, possibly making it optional.

Rationale: I use Plejd's time feature to trigger scenarios, and it is very handy that HA makes sure its time is correct. Yes, with #54, I can also trigger Plejd scenarios from HA, but I guess some people still want to use Plejd to setup astro/time triggers.

[klali]

Fair enough.. it doesn't disturb me at all that it gets my time wrong half the year since I don't use the app or time at all.