See attached.

On Monday, October 12, 2020 at 9:36:08 AM UTC-6 [email protected] wrote:

>
> Well, I don’t understand how that configuration even got that far. I would 
> have expected the previous error. But just seeing log snippets is like 
> walking around blindfolded.  Base on your last config snippet, replace it 
> with 
>
>         The topics to subscribe to.
>         [[topics]]
>         # Units for MQTT payloads without unit value.
>         # Valid values: US, METRIC, METRICWX
>         # Default is: US
>         unit_system = US    
>         ignore_start_time = true
>         ignore_end_time = true
>         use_topic_as_fieldname = true
>         
>         # The first topic
>         # MQTT Topic
>         [[[snowDepth]]]
>
> This last error has to do with trying to convert the units of snowDepth. 
> Either it WeeWX does not fully support that, or more likely I am doing 
> something wrong. But since everything is in the US unit_system, you don’t 
> need to specify units at the field level.
>
> On Monday, 12 October 2020 at 10:38:14 UTC-4 [email protected] wrote:
>
>> I  decided to try simplifying the topic to just snowDepth, as this:
>>
>>  The topics to subscribe to.
>>     [[topics]]
>>         # Units for MQTT payloads without unit value.
>>         # Valid values: US, METRIC, METRICWX
>>         # Default is: US
>>         unit_system = US    
>>     ignore_start_time = true
>>         ignore_end_time = true
>> use_topic_as_fieldname = true
>>         
>>         # The first topic
>>         # MQTT Topic
>>         [[[snowDepth]]]
>>             # MQTT name
>>             [[[[snowDepth]]]]
>>                 # weewx name
>>                 name = snowDepth
>>                 ignore = false
>>                 contains_total = false
>>                 conversion_type = float
>>                 units = inch
>>
>> when I publish 2.5 to snowDepth, I get this error in syslog:
>>
>> Oct 12 08:12:52 raspberrypi weewx[29222] DEBUG user.MQTTSubscribe: 
>> (Service) MessageCallbackProvider data-> incoming topic: snowDepth, QOS: 0, 
>> retain: 0, payload: b'2.5'
>> Oct 12 08:12:52 raspberrypi weewx[29222] DEBUG weewx.units: Unable to 
>> convert from inch to None
>> Oct 12 08:12:52 raspberrypi weewx[29222] ERROR user.MQTTSubscribe: 
>> (Service) MessageCallbackProvider on_message_individual failed with: None
>> Oct 12 08:12:52 raspberrypi weewx[29222] ERROR user.MQTTSubscribe: 
>> (Service) **** MessageCallbackProvider Ignoring topic=snowDepth and 
>> payload=b'2.5'
>>
>> Could you perhaps post a working configuration file, any topic, any unit, 
>> etc. just one that works on your weewx and I will plug it in and see what 
>> happens?
>>
>> On Sunday, October 11, 2020 at 7:27:15 PM UTC-6 Timothy Buchanan wrote:
>>
>>> See attached.
>>>
>>> On Sunday, October 11, 2020 at 5:45:43 PM UTC-6 [email protected] wrote:
>>>
>>>> Sorry, I didn’t get the config quite right. I don’t subscribe to 
>>>> ‘individual’ topics, so this is untested, but should work.  If it doesn’t, 
>>>> I’ll spin up a debug environment to figure it out.
>>>> [[topics]]
>>>>   Keep the current settings, unit_system, ignore_start_time, 
>>>> ignore_end_time, etc.
>>>>
>>>>   # The next option will take the tail end of the topic and use it as 
>>>> the MQTT field name
>>>>   # So, if the topic is snow/snowDepth, the MQTT field name is snowDepth
>>>>   # Only valid when the payload is type ‘individual’
>>>>   use_topic_as_fieldname = true
>>>>   [[[snow/snowDepth]]]
>>>>     # Because snowDepth is the WeeWX name and the defaults work for 
>>>> you, nothing else is needed.
>>>>    [[[snow/snowRate]]]
>>>>      # Not sure, but the defaults should probably work here...
>>>>
>>>> Again, if this doesn’t work; post the log and I’ll spin up a debug 
>>>> environment to figure out what is going on.  
>>>> rich
>>>> On Sunday, 11 October 2020 at 16:43:58 UTC-4 [email protected] 
>>>> wrote:
>>>>
>>>>> After moving the ignore lines, I am happy to report that the time 
>>>>> problem is solved; that is, it is no longer rejecting the topic. However, 
>>>>> it is still not making it into the database. I think this is because it 
>>>>> is 
>>>>> not converting from snow/snowDepth to snowDepth. See attached syslog 
>>>>> extract and weewx.conf for section where topic is configured. Is there a 
>>>>> mistake in this topic configuration?
>>>>>
>>>>> On Sunday, October 11, 2020 at 11:26:27 AM UTC-6 [email protected] 
>>>>> wrote:
>>>>>
>>>>>> I've run both extensions off and on, so I don't think there is any 
>>>>>> conflict. The root-root cause is time skew between your pi and weather 
>>>>>> station and MQTTSubscribe being a bit overly aggressive on its quality 
>>>>>> control. Setting ignore_start_time and ignore_end_time should turn this 
>>>>>> off 
>>>>>> completely. Since the incoming data has no dateTime, this seems the most 
>>>>>> logical approach.
>>>>>>
>>>>>> I noticed in the latest attached config, those options are in the 
>>>>>> wrong place. Move them under [[topics]] after 
>>>>>>   unit_system = US
>>>>>>   ignore_start_time = true 
>>>>>>   ignore_end_time = true
>>>>>> Also, Ignore_end_time has a capital "I".
>>>>>> If it is still not working, please attach the log from startup. That 
>>>>>> way we can see how the options are being processed.
>>>>>> I think we are real close. -rich
>>>>>>
>>>>>> On Sunday, 11 October 2020 at 12:20:32 UTC-4 [email protected] 
>>>>>> wrote:
>>>>>>
>>>>>>> I used wee_extension to uninstall the old version then install the 
>>>>>>> new. I used the configuration as shown in the attached file. When I 
>>>>>>> publish 
>>>>>>> to a topic, Topic Manager still ignores it as outside of interval 
>>>>>>> (syslog 
>>>>>>> extract in attached file).
>>>>>>>
>>>>>>> I'm thinking that MQTTSubscribe is not compatible with the mqtt 
>>>>>>> extension. I note that MQTTSubscribe is publishing records of data that 
>>>>>>> it 
>>>>>>> is not subscribed to, but which are published by mqtt. Have you tried 
>>>>>>> running MQTTSubscribe and mqtt together?
>>>>>>>
>>>>>>> On Saturday, October 10, 2020 at 5:10:34 PM UTC-6 [email protected] 
>>>>>>> wrote:
>>>>>>>
>>>>>>>> I created a pre-release with the fix. It is here, 
>>>>>>>> https://github.com/bellrichm/WeeWX-MQTTSubscribe/releases/tag/v1.6.2-rc03
>>>>>>>> Hopefully this is it. 
>>>>>>>> rich
>>>>>>>> On Saturday, 10 October 2020 at 10:15:29 UTC-4 
>>>>>>>> [email protected] wrote:
>>>>>>>>
>>>>>>>>> OK, thanks  for your help.
>>>>>>>>>
>>>>>>>>> On Saturday, October 10, 2020 at 7:22:18 AM UTC-6 
>>>>>>>>> [email protected] wrote:
>>>>>>>>>
>>>>>>>>>> Thanks for the log. Looks like there is a bug with the 
>>>>>>>>>> ignore_start_time option.  Fix looks easy, I just need to make sure 
>>>>>>>>>> there 
>>>>>>>>>> are no side effects.
>>>>>>>>>> I’ll let you know when the fix is available. 
>>>>>>>>>> - rich
>>>>>>>>>>
>>>>>>>>>> On Friday, 9 October 2020 at 22:55:11 UTC-4 [email protected] 
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> I added those this way:
>>>>>>>>>>>
>>>>>>>>>>> # The topics to subscribe to.
>>>>>>>>>>>     [[topics]]
>>>>>>>>>>>         # Units for MQTT payloads without unit value.
>>>>>>>>>>>         # Valid values: US, METRIC, METRICWX
>>>>>>>>>>>         # Default is: US
>>>>>>>>>>>         unit_system = US
>>>>>>>>>>> ignore_start_time = true
>>>>>>>>>>> Ignore_end_time = true
>>>>>>>>>>>
>>>>>>>>>>> but I still get this:
>>>>>>>>>>>
>>>>>>>>>>> Oct  9 20:38:29 raspberrypi weewx[30461] INFO weewx.restx: MQTT: 
>>>>>>>>>>> Published record 2020-10-09 20:38:47 MDT (1602297527)
>>>>>>>>>>> Oct  9 20:38:30 raspberrypi weewx[30461] DEBUG 
>>>>>>>>>>> user.MQTTSubscribe: (Service) MessageCallbackProvider data-> 
>>>>>>>>>>> incoming 
>>>>>>>>>>> topic: snow/snowDepth, QOS: 0, retain: 0, payload: b'7'
>>>>>>>>>>> Oct  9 20:38:30 raspberrypi weewx[30461] DEBUG 
>>>>>>>>>>> user.MQTTSubscribe: (Service) TopicManager data-> incoming 
>>>>>>>>>>> snow/snowDepth: 
>>>>>>>>>>> snow/snowDepth: 7.0
>>>>>>>>>>> Oct  9 20:38:31 raspberrypi weewx[30461] DEBUG 
>>>>>>>>>>> user.MQTTSubscribe: (Service) TopicManager data-> outgoing 
>>>>>>>>>>> snow/snowDepth: 
>>>>>>>>>>> dateTime: 1602297510.2596123, snow/snowDepth: 7.0, usUnits: 1
>>>>>>>>>>> Oct  9 20:38:31 raspberrypi weewx[30461] INFO 
>>>>>>>>>>> user.MQTTSubscribe: (Service) TopicManager ignoring record outside 
>>>>>>>>>>> of 
>>>>>>>>>>> interval 1602297510.259612 1602297529.000000 1602297510.259612 
>>>>>>>>>>> dateTime: 
>>>>>>>>>>> 1602297510.2596123, snow/snowDepth: 7.0, usUnits: 1
>>>>>>>>>>> Oct  9 20:38:31 raspberrypi weewx[30461] DEBUG 
>>>>>>>>>>> user.MQTTSubscribe: (Service) TopicManager data-> outgoing 
>>>>>>>>>>> accumulated 
>>>>>>>>>>> snow/snowDepth: 
>>>>>>>>>>> Oct  9 20:38:31 raspberrypi weewx[30461] DEBUG 
>>>>>>>>>>> user.MQTTSubscribe: (Service) data-> final packet is 2020-10-09 
>>>>>>>>>>> 20:38:49 
>>>>>>>>>>> MDT (1602297529): avg_distance: 0, dateTime: 1602297529, 
>>>>>>>>>>> lightning_strikes: 
>>>>>>>>>>> 0, outHumidity: 23, outTemp: 13.34, outTempBatteryStatus: 2.919, 
>>>>>>>>>>> pressure: 
>>>>>>>>>>> 744.7, usUnits: 17
>>>>>>>>>>> Oct  9 20:38:31 raspberrypi weewx[30461] INFO weewx.restx: MQTT: 
>>>>>>>>>>> Published record 2020-10-09 20:38:49 MDT (1602297529)
>>>>>>>>>>> Oct  9 20:38:32 raspberrypi weewx[30461] DEBUG 
>>>>>>>>>>> user.MQTTSubscribe: (Service) data-> final packet is 2020-10-09 
>>>>>>>>>>> 20:38:50 
>>>>>>>>>>> MDT (1602297530): dateTime: 1602297530, usUnits: 17, windDir: 336, 
>>>>>>>>>>> windSpeed: 0.72
>>>>>>>>>>> Oct  9 20:38:32 raspberrypi weewx[30461] INFO weewx.restx: MQTT: 
>>>>>>>>>>> Published record 2020-10-09 20:38:50 MDT (1602297530)
>>>>>>>>>>>
>>>>>>>>>>> On Friday, October 9, 2020 at 5:13:41 PM UTC-6 [email protected] 
>>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Ah, crap.  This has to do with an attempt to quality control 
>>>>>>>>>>>> data by time. Next major release, I really need to rework it...
>>>>>>>>>>>> Since you have individual payloads (no timestamp from the 
>>>>>>>>>>>> origin) add the following under [[topics]]
>>>>>>>>>>>> ignore_start_time = true
>>>>>>>>>>>> Ignore_end_time = true
>>>>>>>>>>>>
>>>>>>>>>>>> We are getting close.  Sorry for the pain.
>>>>>>>>>>>> rich
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Friday, 9 October 2020 at 18:36:27 UTC-4 
>>>>>>>>>>>> [email protected] wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> syslog extract posted. weewx is loading the service, though it 
>>>>>>>>>>>>> also seems to subscribe to the data which MQTT is publishing from 
>>>>>>>>>>>>> weewx. 
>>>>>>>>>>>>> the second section shows that subscribe receives the data I 
>>>>>>>>>>>>> published from 
>>>>>>>>>>>>> the terminal (6 inches of snow), but rejects it as outside of 
>>>>>>>>>>>>> interval. Is 
>>>>>>>>>>>>> there an entry to be made somewhere to sync incoming data? I note 
>>>>>>>>>>>>> that 
>>>>>>>>>>>>> another extension I use (GW1000) needed dateTime = datetime in a 
>>>>>>>>>>>>> field map 
>>>>>>>>>>>>> to work properly.
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Friday, October 9, 2020 at 2:54:56 PM UTC-6 
>>>>>>>>>>>>> [email protected] wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> That could be simplified, but looks like it should work. The 
>>>>>>>>>>>>>> quickest and easiest way to proceed is to set debug to 1, 
>>>>>>>>>>>>>> restart WeeWX, 
>>>>>>>>>>>>>> let it run through an archive cycle during which you published 
>>>>>>>>>>>>>> to that 
>>>>>>>>>>>>>> topic and then post the log.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Re: snowBatteryStatus - The units config option is only 
>>>>>>>>>>>>>> needed if the field units do not match the units expected by the 
>>>>>>>>>>>>>> unit_system. So eliminating will at least get the data in the 
>>>>>>>>>>>>>> DB. 
>>>>>>>>>>>>>> Note, units is not needed for snowDepth because inches is the 
>>>>>>>>>>>>>> Units for that field in the US unit_system.
>>>>>>>>>>>>>> rich
>>>>>>>>>>>>>> On Friday, 9 October 2020 at 14:23:01 UTC-4 
>>>>>>>>>>>>>> [email protected] wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I've attached a syslog extract showing where weewx crashed. 
>>>>>>>>>>>>>>> it seems that "volt" is an invalid unit for my topic. i don't 
>>>>>>>>>>>>>>> know why but 
>>>>>>>>>>>>>>> for now I commented out that topic and its parameters. Now, 
>>>>>>>>>>>>>>> weewx will 
>>>>>>>>>>>>>>> continue running when subscribe is enabled, but subscribed 
>>>>>>>>>>>>>>> topics are not 
>>>>>>>>>>>>>>> being posted to the database. Here is the first topic in 
>>>>>>>>>>>>>>> weewx.conf:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>         # The first topic
>>>>>>>>>>>>>>> # MQTT Topic
>>>>>>>>>>>>>>> [[[snow/snowDepth]]]
>>>>>>>>>>>>>>> # MQTT name
>>>>>>>>>>>>>>> [[[[snowDepth]]]]
>>>>>>>>>>>>>>> # weewx name
>>>>>>>>>>>>>>> name = snowDepth
>>>>>>>>>>>>>>> ignore = false
>>>>>>>>>>>>>>> contains_total = false
>>>>>>>>>>>>>>> conversion_type = float
>>>>>>>>>>>>>>> units = inch
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I used a terminal to publish "6" to snow/snowDepth on 
>>>>>>>>>>>>>>> Mosquitto. Another terminal window command to subscribe to 
>>>>>>>>>>>>>>> snow/snowDepth 
>>>>>>>>>>>>>>> received the "6" but the database entries for snowDepth are 
>>>>>>>>>>>>>>> null. Is this 
>>>>>>>>>>>>>>> configuration of topics still not correct. Thanks.
>>>>>>>>>>>>>>> On Tuesday, October 6, 2020 at 1:43:31 PM UTC-6 Timothy 
>>>>>>>>>>>>>>> Buchanan wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Thanks, Rich. I'll try it when I get back. I'll be in our 
>>>>>>>>>>>>>>>> second home for a few days: going to the gun range and the 
>>>>>>>>>>>>>>>> clothing-optional resort (not at the same time!).
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Tuesday, October 6, 2020 at 1:19:26 PM UTC-6 
>>>>>>>>>>>>>>>> [email protected] wrote:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> So, the [[[first/topic]]] are meant to be replaced with 
>>>>>>>>>>>>>>>>> the actual topic. So it would be something like this
>>>>>>>>>>>>>>>>> ```
>>>>>>>>>>>>>>>>> [[Topics]]
>>>>>>>>>>>>>>>>>   [[[topic name that snowDepth is published on]]]
>>>>>>>>>>>>>>>>>     [[[[topic name that snowDepth is published on]]]]
>>>>>>>>>>>>>>>>>       name = snowDepth
>>>>>>>>>>>>>>>>>   [[[topic name that snowRate is published on]]]
>>>>>>>>>>>>>>>>>     [[[[topic name that snowRate is published on]]]]
>>>>>>>>>>>>>>>>>       name = snowRate
>>>>>>>>>>>>>>>>> ```
>>>>>>>>>>>>>>>>> The duplication is an artifact of dealing with json and 
>>>>>>>>>>>>>>>>> keyword payloads. The ```use_topic_as_fieldname``` option 
>>>>>>>>>>>>>>>>> can be used to make the config a bit prettier.
>>>>>>>>>>>>>>>>> ```
>>>>>>>>>>>>>>>>> [[Topics]]
>>>>>>>>>>>>>>>>>   use_topic_as_fieldname = true
>>>>>>>>>>>>>>>>>   [[[topic name that snowDepth is published on]]]
>>>>>>>>>>>>>>>>>     name = snowDepth
>>>>>>>>>>>>>>>>>   [[[topic name that snowRate is published on]]]
>>>>>>>>>>>>>>>>>     name = snowRate
>>>>>>>>>>>>>>>>> ```
>>>>>>>>>>>>>>>>> Note, if snowDepth is actually published on the topic 
>>>>>>>>>>>>>>>>> snowDepth, the ```name``` option can be left off.
>>>>>>>>>>>>>>>>> I don’t think that you want to set contains_total=true for 
>>>>>>>>>>>>>>>>> snowDepth. This is used when the field contains a total and 
>>>>>>>>>>>>>>>>> it needs to be 
>>>>>>>>>>>>>>>>> converted into an increment for WeeWX.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> I’ll work on clarifying the wiki.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> With that said, it shouldn’t have broken WeeWX. If you are 
>>>>>>>>>>>>>>>>> up for it, before changing the config, setting debug=1, 
>>>>>>>>>>>>>>>>> restarting WeeWX 
>>>>>>>>>>>>>>>>> for a couple of archive intervals and attaching the log would 
>>>>>>>>>>>>>>>>> be 
>>>>>>>>>>>>>>>>> appreciated .
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> rich
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> On Tuesday, 6 October 2020 at 13:28:34 UTC-4 
>>>>>>>>>>>>>>>>> [email protected] wrote:
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Attached is the extension material that I put into 
>>>>>>>>>>>>>>>>>> weewx.conf. But when I set enable = true, weewx stops 
>>>>>>>>>>>>>>>>>> archiving data. Is 
>>>>>>>>>>>>>>>>>> there an error in this configuration, or could subscribe be 
>>>>>>>>>>>>>>>>>> incompatible 
>>>>>>>>>>>>>>>>>> with another service? I'm using the Weatherflowudp driver 
>>>>>>>>>>>>>>>>>> with mqtt and 
>>>>>>>>>>>>>>>>>> GW1000 extensions.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> On Tuesday, October 6, 2020 at 9:17:07 AM UTC-6 Timothy 
>>>>>>>>>>>>>>>>>> Buchanan wrote:
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Thanks, Rich, I should be able to edit weewx.conf based 
>>>>>>>>>>>>>>>>>>> on the example at the bottom of that page.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> I am using an ESP8266 board with an ultrasonic sensor 
>>>>>>>>>>>>>>>>>>> and a temperature sensor (to calibrate the speed of sound), 
>>>>>>>>>>>>>>>>>>> and programming 
>>>>>>>>>>>>>>>>>>> in the Arduino IDE. I'll 3D print a case and mount it above 
>>>>>>>>>>>>>>>>>>> my deck. The 
>>>>>>>>>>>>>>>>>>> materials cost about $15.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> I'd be happy to post the code here, under a new topic, 
>>>>>>>>>>>>>>>>>>> once I get it working.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Timothy
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> On Tuesday, October 6, 2020 at 8:53:45 AM UTC-6 
>>>>>>>>>>>>>>>>>>> [email protected] wrote:
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>> What type of sensor are you using for measuring snow 
>>>>>>>>>>>>>>>>>>>> depth?
>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>

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When I use this config:

# Options for extension 'MQTTSubscribe'
[MQTTSubscribeService]

    # This section is for the MQTTSubscribe service.
    
    # Turn the service on and off.
    # Default is: true
    # Only used by the service.
    enable = true
    
    # The MQTT server.
    # Default is localhost.
    host = localhost
    
    # The port to connect to.
    # Default is 1883.
    port = 1883
    
    # Maximum period in seconds allowed between communications with the broker.
    # Default is 60.
    keepalive = 60
    
    # username for broker authentication.
    # Default is None.
    username = None
    
    # password for broker authentication.
    # Default is None.
    password = None
    
    # The binding, loop or archive.
    # Default is: loop
    # Only used by the service.
    binding = loop

    # The message handler to use
    [[message_callback]]
        # The format of the MQTT payload.
        # Currently support: individual, json, keyword
        # Must be specified.
        type = individual
    
    # The topics to subscribe to.
    [[topics]]
        # Units for MQTT payloads without unit value.
        # Valid values: US, METRIC, METRICWX
        # Default is: US
        unit_system = US    
        ignore_start_time = true
        ignore_end_time = true
        use_topic_as_fieldname = true
        
        # The first topic
        # MQTT Topic
        [[[snowDepth]]]
            # MQTT name
            [[[[snowDepth]]]]

                # weewx name
                name = snowDepth
                ignore = false
                contains_total = false
                conversion_type = float
                #units = inch
        
        # The second topic
        [[[snowRate]]]
            [[[[snowRate]]]]
                name = snowRate
                ignore = false
                contains_total = False
                conversion_type = float
                units = inch_per_hour

I get this error:

12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__: Caught unrecoverable 
exception:
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****  
MQTTSubscribe: use_topic_as_fieldname is mutually exclusive with 
[[[[fieldname]]]] configuring
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****  Traceback 
(most recent call last):
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****    File 
"/usr/share/weewx/weewxd", line 148, in main
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****      engine 
= weewx.engine.StdEngine(config_dict)
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****    File 
"/usr/share/weewx/weewx/engine.py", line 75, in __init__
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****      
self.loadServices(config_dict)
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****    File 
"/usr/share/weewx/weewx/engine.py", line 138, in loadServices
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****      obj = 
weeutil.weeutil.get_object(svc)(self,config_dict)
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****    File 
"/usr/share/weewx/user/MQTTSubscribe.py", line 1528, in __init__
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****      
self.subscriber = MQTTSubscriber(service_dict, self.logger)
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****    File 
"/usr/share/weewx/user/MQTTSubscribe.py", line 1305, in __init__
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****      
self.manager = TopicManager(topics_dict, self.logger)
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****    File 
"/usr/share/weewx/user/MQTTSubscribe.py", line 679, in __init__
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****      raise 
ValueError("MQTTSubscribe: use_topic_as_fieldname is mutually exclusive with 
[[[[fieldname]]]] configuring")
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****  
ValueError: MQTTSubscribe: use_topic_as_fieldname is mutually exclusive with 
[[[[fieldname]]]] configuring
Oct 12 09:59:19 raspberrypi weewx[2400] CRITICAL __main__:     ****  Exiting.

If I comment out this line:

        use_topic_as_fieldname = true

then subscribe will accept a published message and place it into the database. 
There are therefore two separate problems.
Subscribe will only accept a simple topic (snowDepth) but not a complex one 
(snow/SnowDepth).
Subscribe will only process units as none. Attempting to specify the unit in 
weewx causes errors.

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