Add support for Ambient Weather variant

[PhracturedBlue]

AmbientWeather and Ecowitt use nearly identical protocols. Ecowitt uses a POST form, whereas AmbientWeather sends all data as params with a GET request.

The only other differences I found with my WS2902 was it sends 'batt_co2' instead of 'co2_batt' (even though it doesn't have any co2 sensor)

This plus a small home-asistant patch enabling 'GET' in the webhook were the only changes I needed to get my weather station working with HASS.

[GSzabados]

@joostlek, this one should be verified with some documentation on the "AmbientWeather" protocol. It would be a nice to have, and would likely make happy a lot of Ambient Weather station owners, as I remember it doesn't have a local option in HA, but from the Ambient Weather site. (And some quirky solutions, as I read in this thread https://community.home-assistant.io/t/ambient-weather-available-locally-now-integration-anyone/299180

@PhracturedBlue, could you provide some documentation on this? Logs, settings to activate the protocol. And any info if there is any PR to core to implement in HA. (That would need a documentation update as well.) I am not fully convinced that this is just a minor change.

[PhracturedBlue]

The only changes in homeassistant are:

--- /usr/src/homeassistant/homeassistant/components/ecowitt/__init__.py
+++ ./__init__.py
@@ -30,7 +30,8 @@
         return await ecowitt.handler(request)
 
     webhook.async_register(
-        hass, DOMAIN, entry.title, entry.data[CONF_WEBHOOK_ID], handle_webhook
+        hass, DOMAIN, entry.title, entry.data[CONF_WEBHOOK_ID], handle_webhook,
+        allowed_methods=[METH_GET, METH_POST, METH_PUT]
     )
 
     @callback

Other than that is just works. In the ambient weather app, I just paste the webhook url as:

server IP:
hass ip address
Path:
/api/webhook/<hass webhook-id>?

And everything works

I can't really file a PR for HASS until this change is accepted, since I need to update the proper version of aioecowitt.

The aioecowitt module doesn't seem to have any documentation, but I can file a PR for Hass documentation as well. But again, it makes little sense to to do util I've filed the HASS PR, which is gated by getting the changes into this module.