HASS Plugin: no way to obtain service response if response is optional.

[maristieuvelonde]

HA services have three possible states for response: null, optional, not optional. Since the new auto detection mechanism was put in place, there is no way to obtain the response from services that mark the the result state as optional such as the conversation API and process service. Unfortunately this means it's impossible to use AppDaemon to write a middleware for conversations.

appdaemon/appdaemon/plugins/hass/hassplugin.py

Lines 750 to 753 in 929ab84

	# Set the return_response flag if doing so is not optional
	match service_properties:
	case {"response": {"optional": False}}:
	req["return_response"] = True

See also this issue #2232 and #2010

Additionally this works perfectly fine while calling the parent websocket method:

req = {
    "type": "call_service",
    "domain": "conversation",
    "service": "process",
    "service_data": {
        "text": "Tell me about something",
    },
    "return_response": True
}
res = await self._plugin.websocket_send_json(**req)

[jsl12]

#2500 provides process_conversation method you can use, and the return_response value now gets passed through on Hass service calls.