Add support for Ambient Weather WH31E about weewx-sdr

[phinnay]

this is the sensor:
https://www.ambientweather.com/amwh31b.html

RTL_433 reads it as a WH31E for whatever reason.

[matthewwall]

added at commit 4427be2

[cweakland]

Just a note, if your battery does not seem correct (always displaying low), you may need to change this line:

    pkt['battery'] = 0 if obj.get('battery') == 'OK' else 1

to:

    pkt['battery'] = 0 if obj.get('battery_ok') == 1 else 1

You can see why in the packet from RTL_433, not sure if this is related to my install or if something changed. Good luck!

$ rtl_433 -M utc -F json -f 914980000 -s 250000
rtl_433 version 21.05-7-g78330501 branch master at 202106031747 inputs file rtl_tcp RTL-SDR
Use -h for usage help and see https://triq.org/ for documentation.
Trying conf file at "rtl_433.conf"...
Trying conf file at "/home/chris/.config/rtl_433/rtl_433.conf"...
Trying conf file at "/usr/local/etc/rtl_433/rtl_433.conf"...
Trying conf file at "/etc/rtl_433/rtl_433.conf"...

New defaults active, use "-Y classic -s 250k" for the old defaults!

Registered 157 out of 186 device decoding protocols [ 1-4 8 11-12 15-17 19-23 25-26 29-36 38-60 63 67-71 73-100 102-105 108-116 119 121 124-128 130-149 151-161 163-168 170-175 177-186 ]
Detached kernel driver
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000 S/s.
Tuner gain set to Auto.
Tuned to 914.980MHz.
Allocating 15 zero-copy buffers
baseband_demod_FM: low pass filter for 250000 Hz at cutoff 50000 Hz, 20.0 us
{"time" : "2022-02-03 22:45:50", "model" : "AmbientWeather-WH31E", "id" : 221, "channel" : 1, "battery_ok" : 1, "temperature_C" : 20.100, "humidity" : 41, "data" : "6800000000", "mic" : "CRC"}