Same here, 'rain' is None unless it's raining, then it'll show data. I
haven't checked the raw packets, but in the archive table the numbers are
all multiples of my tipping bucket size, so that all makes sense.
That's why I added the "check for Null/None" if-clause.
But to be populated with data, 'rain' has to be defined. And weewx crashes
on that
if event.record['rain'] != None:
clause. Do I need to check for a packet? like event.package?
On Friday, May 3, 2024 at 12:29:38 PM UTC-5 František Slimařík wrote:
> I believe "rain" is specific in this case. I was checking raw packets
> previously on my device and normally is rain "none" if it´s not raining ;)
> So it depends what your device is sending to weewx.
>
> raw packet: {'dateTime': 1642794129, 'usUnits': 1, 'rain_total': 0.0,
> 'barometer': 30.22, 'temperature_out': 28.7, 'dewpoint': 20.1,
> 'humidity_out': 69.0, 'wind_speed': 2.6, 'wind_gust': 2.6, 'wind_dir':
> 268.0, 'solar_radiation': 0.0, 'uv': 0.0, 'temperature_in': 70.1,
> 'humidity_in': 51.0, 'rain': None}
>
> pá 3. 5. 2024 v 15:37 odesílatel Michael Frotscher <[email protected]>
> napsal:
>
>> Hmm,
>> ok, so it works for "pressure", which contains data in every archive
>> period and is not None.
>> I've tried to substitute that with "rain", which is what I really want.
>> That is usually "Null/None" in the database, but gets the amount of a
>> bucket tip added to it every time that happens.
>> It is fed by MQTT, which publishes the bucket amount on every tip, and
>> that works. It even sums them up correctly if several bucket tips occur in
>> an archive period.
>>
>> However, trying to retrieve that with "if event.record['rain'] != None:"
>> I get a Key Error. Meaning the variable doesn't exist. Isn't every weewx
>> measurement in the dictionary?
>> That happens with any measurement that's in the database but normally
>> "Null".
>>
>> I've tried to define it as Null/None in the init-part of the service
>> rain = None
>>
>> But still get the key error.
>>
>> Thanks!
>> On Friday, May 3, 2024 at 7:30:12 AM UTC-5 Michael Frotscher wrote:
>>
>>> Thanks, guys!
>>> I see my mistake now. It's not about strings/floats at all, but I
>>> wrongly assumed that all measurements that have values assigned to them
>>> (via LOOP or whatever) would already be defined as global variables.
>>> That's obviously not the case, but assigning the last value to the
>>> variable via "event.record['pressure']" (as Frantisek pointed out) is
>>> necessary. I'm still not sure why that needs to be in single quotes,
>>> indicating a string and not a number.
>>> I would have expected something like "event.record(pressure)".
>>>
>>> I have to admit that I have not found this in any examples out there,
>>> and not in the documentation for sure.
>>>
>>> But it's now doing what I want.
>>>
>>> On Friday, May 3, 2024 at 12:16:50 AM UTC-5 František Slimařík wrote:
>>>
>>>> I guess you want something like this:
>>>>
>>>> if event.record['pressure'] != None:
>>>> newpressure = (event.record['pressure'] * 10)
>>>> event.record['pb'] = newpressure
>>>>
>>>> Dne pátek 3. května 2024 v 3:38:01 UTC+2 uživatel Tom Keffer napsal:
>>>>
>>>>> On Thu, May 2, 2024 at 6:32 PM Michael Frotscher <[email protected]>
>>>>> wrote:
>>>>>
>>>>>> Here's the full code of my service:
>>>>>>
>>>>>>
>>>>> def new_archive_packet(self, event):
>>>>>>
>>>>>> if 'pressure' != None:
>>>>>> newpressure = ('pressure' * 10)
>>>>>> event.record['pb'] = newpressure
>>>>>>
>>>>>
>>>>>
>>>>> Strictly interpreted, you first ask whether the string "'pressure'" is
>>>>> equal to None. It's not, so we proceed to the next statement. Now you're
>>>>> trying to multiply a string ('pressure') by 10. Surprisingly, this will
>>>>> succeed, but likely does not give you the results you expect. The
>>>>> variable
>>>>> "newpressure" will actually be set to the string
>>>>> 'pressurepressurepressurepressurepressurepressurepressurepressurepressurepressure'.
>>>>>
>>>>> That is, the string 'pressure' concatenated 10 times.
>>>>>
>>>>> You want a *variable* pressure, not the literal string 'pressure'.
>>>>> Where will it come from?
>>>>>
>>>>> I would suggest taking an online Python course if this is unfamiliar
>>>>> to you.
>>>>>
>>>>> -tk
>>>>>
>>>>>
>>>>> --
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