Can anyone provide an example of JSON formatting expected in node-red for calling services?

[jerblack]

I am trying to get TTS working in node-red with the Call Service and Function nodes because I want to be able to generate a TTS message with Javascript, but I am stuck on trying to figure out what format the notify service is actually expecting, and this doesn't seem to be documented anywhere. I get lots of messages about keys missing in the debug pane but I don't see anywhere what format is expected. Can someone please provide a clean, basic example of the JSON (not YAML) required to make these two nodes work together. Here's a sample of what I'm using in the function node, but it's not working.

const p = {
  "msg": {
    "data": {
      "domain": "notify",
      "service": "alexa_media_living_room_echo",
      "message": "it is 60 degrees",
      "data": {
        "type": "tts"
      }
    }
  }
}

node.send(p)
return msg

[jerblack]

Never mind, I figure it out with help from this issue:
AYapejian/node-red-contrib-home-assistant#59
I ended up with an empty Call Service node with {} in the Data field and this in the Function Node

const newTemp = msg.data.new_state.attributes.temperature
const oldTemp = msg.data.old_state.attributes.temperature

if (newTemp !== oldTemp && newTemp >= 60) {
    msg.payload = {
        domain: "notify",
        service: "alexa_media_living_room_echo",
        data: {
            message: "it is "+ newTemp +" degrees",
            data: {
              type: "tts"
        }
      }
    }
    node.send(msg);
}


return ;