I tried that. I get an unrecognized hardware error and it doesn’t complete. 
Same if I try the wee_device —info
Does the Vantage driver not support the Weather Envoy ?.

> On Jul 25, 2019, at 4:20 AM, Thomas Keffer <[email protected]> wrote:
> 
> Use wee_device with the --clear-memory option. Be sure to stop weewx first.
> 
> -tk
> 
>> On Thu, Jul 25, 2019 at 2:48 AM Allan Tyson <[email protected]> wrote:
>> I have a Davis USB Westher Envoy connected to an RPi running weewx. It was 
>> running fine but I stopped weewx on the RPi and disconnected the Weather 
>> Envoy USB cable from the RPi to connect it to another RPi I was using to 
>> install Raspbian Buster with weewx on a smaller micro SD card so I could 
>> save it’s image to a smaller backup image file  having originally installed 
>> it on an internal 120GB SSD drive.
>>  The new installation worked just great but when I reconnected the Weather 
>> Envoy to the original RPi I discovered that the USB loggers’s memory was 
>> somehow corrupted so that weewx would no longer update Nginx. I cleared the 
>> memory by connecting the Logger to my Mac laptop & used WeatherLink to clear 
>> the archive memory.
>>  There was a Post by Tom in 2012 saying you could change the configuration 
>> of a weather envoy using the config utility in weewx as well as using the 
>> WeatherLink software. I did see the instructions for using wee_device to 
>> change the parameters of the Davis driver but when running it I get an 
>> unrecognized hardware error and the Weather Envoy isn’t listed as being 
>> supported hardware in the list of supported hardware. Only the  Vantsge Vue 
>> and Vantsge Pro2 Consoles are listed though in the pictorial list of 
>> supported hardware the Weather Envoy is shown.
>>  Is there a way of clearing the Weather Envoy archive memory from the 
>> command line of the RPi so I can clear it without having to stop the RPI, 
>> disconnect the Envoy USB cable and connect it to my laptop to use the 
>> WeatherLink software to perform the clearing and then have to reconnect it 
>> to my RPi ?.
>> 
>> Allan
>> 
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