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Requests and responses

These are the requests and responses we have received while integrating Home Assistant as a local hub device with Actions on Google.

For testing, do a zeroconf broadcast to start the IDENTIFY intent. Once you are able to reach REACHABLE_DEVICES interaction, you will need to restart the Google Assistant device between each try.

Updated for Google Home v1.44 (preview released on December 4).

SYNC response sent to Google

{
  "msgid": "a0ec2919-a883-492e-a38d-93b068b9c08a",
  "payload": {
    "payload": {
      "agentUserId": "19199de777b74d9fa7bf91f9a287e147",
      "devices": [
        {
          "attributes": {
            "colorModel": "hsv",
            "colorTemperatureRange": {
              "temperatureMaxK": 6535,
              "temperatureMinK": 2000
            }
          },
          "customData": {
            "httpPort": 8123,
            "httpSSL": false,
            "webhookId": "ff284724789c7789d9f784765475df545227902f6c81e67f0f9254efc7cca30e"
          },
          "id": "light.ceiling_lights",
          "name": { "name": "Ceiling Lights" },
          "otherDeviceIds": [{ "deviceId": "light.ceiling_lights" }],
          "traits": [
            "action.devices.traits.Brightness",
            "action.devices.traits.OnOff",
            "action.devices.traits.ColorSetting"
          ],
          "type": "action.devices.types.LIGHT",
          "willReportState": false
        }
      ]
    },
    "requestId": "14145511951361306028"
  }
}
  • For our implementation, customData contains info to reach Home Assistant and it contains the device ID of the hub.
  • otherDeviceIds is set to the device ID of the Home Assistant instance as per the docs. This device is not part of the normal SYNC response but will be identified during the IDENTIFY intent.

IDENTIFY intent received from Google

{
  "requestId": "55EB909FBFAAE72114FE8928C2B87267",
  "inputs": [
    {
      "intent": "action.devices.IDENTIFY",
      "payload": {
        "device": {
          "mdnsScanData": {
            "serviceName": "devhome._home-assistant._tcp.local",
            "name": "devhome",
            "type": "home-assistant",
            "protocol": "tcp",
            "data": [
              "version=0.104.0.dev0",
              "base_url=http://192.168.1.234:8123",
              "requires_api_password=true"
            ],
            "txt": {
              "version": "0.104.0.dev0",
              "base_url": "http://192.168.1.234:8123",
              "requires_api_password": "true"
            }
          }
        },
        "structureData": {}
      }
    }
  ],
  "devices": [
    {
      "id": "light.ceiling_lights",
      "customData": {
        "httpPort": 8123,
        "httpSSL": false,
        "webhookId": "ff284724789c7789d9f784765475df545227902f6c81e67f0f9254efc7cca30e"
      }
    }
  ]
}
  • mdnsScanData contains our broadcasted data. We don't need it as we store all data as custom data on our synchronized devices.
  • devices contains our synchronized devices.

IDENTIFY response sent to Google

  "requestId": "55EB909FBFAAE72114FE8928C2B87267",
  "payload": {
    "device": {
      "id": "19199de777b74d9fa7bf91f9a287e147",
      "isLocalOnly": true,
      "isProxy": true,
      "deviceInfo": {
        "hwVersion": "UNKNOWN_HW_VERSION",
        "manufacturer": "Home Assistant",
        "model": "Home Assistant",
        "swVersion": "0.104.0.dev0"
      }
    }
  },
  "intent": "action.devices.IDENTIFY"
}
  • isLocalOnly is set to true to indicate that this device does not appear in the SYNC response as per the docs.
  • isProxy is set to true to indicate that this is a hub device that will proxy commands for other devices as per the docs.
  • type is not set because we were unable to find a matching type for hubs.

REACHABLE_DEVICES intent received from Google

{
  "requestId": "D1B0B8955639E2A634A94E6DDED0A6D9",
  "inputs": [
    {
      "intent": "action.devices.REACHABLE_DEVICES",
      "payload": {
        "device": {
          "id": "19199de777b74d9fa7bf91f9a287e147",
          "customData": {},
          "proxyData": {}
        },
        "structureData": {}
      }
    }
  ],
  "devices": [
    {
      "id": "light.ceiling_lights",
      "customData": {
        "httpPort": 8123,
        "httpSSL": false,
        "webhookId": "ff284724789c7789d9f784765475df545227902f6c81e67f0f9254efc7cca30e"
      }
    },
    {
      "id": "19199de777b74d9fa7bf91f9a287e147",
      "customData": {}
    }
  ]
}
  • You will receive this intent every minute.
  • Our hub is now also part of devices.

REACHABLE_DEVICES response sent to Google

{
  "requestId": "D1B0B8955639E2A634A94E6DDED0A6D9",
  "payload": {
    "devices": [
      {
        "verificationId": "light.ceiling_lights"
      }
    ]
  },
  "intent": "action.devices.REACHABLE_DEVICES"
}

PROXY_SELECTED intent received from Google

{
  "requestId": "063354DA47A8398DDFFC6028C754F611",
  "inputs": [
    {
      "intent": "action.devices.PROXY_SELECTED",
      "payload": {
        "device": {
          "id": "19199de777b74d9fa7bf91f9a287e147",
          "customData": {}
        },
        "structureData": {}
      }
    }
  ],
  "devices": [
    {
      "id": "light.ceiling_lights",
      "customData": {
        "httpPort": 8123,
        "httpSSL": false,
        "webhookId": "ff284724789c7789d9f784765475df545227902f6c81e67f0f9254efc7cca30e"
      }
    },
    {
      "id": "19199de777b74d9fa7bf91f9a287e147",
      "customData": {}
    }
  ]
}

Receiving this intent is undocumented behavior.

This is also issue #1 for smart-home-local on GitHub.

I've been able to work around it by following advice from Googler @proppy to stub it out and return an empty response:

app.onProxySelected(req => {
  return {};
});

EXECUTE intent received from Google

To trigger this intent, tell Google "force local" before saying a command.

{
  "inputs": [
    {
      "context": {
        "locale_country": "US",
        "locale_language": "en"
      },
      "intent": "action.devices.EXECUTE",
      "payload": {
        "commands": [
          {
            "devices": [
              {
                "customData": {
                  "httpPort": 8123,
                  "httpSSL": false,
                  "webhookId": "ff284724789c7789d9f784765475df545227902f6c81e67f0f9254efc7cca30e"
                },
                "id": "light.ceiling_lights"
              }
            ],
            "execution": [
              {
                "command": "action.devices.commands.OnOff",
                "params": {
                  "on": true
                }
              }
            ]
          }
        ],
        "structureData": {}
      }
    }
  ],
  "requestId": "3055233711694216560"
}

EXECUTE response sent to Google

{
  "requestId": "3055233711694216560",
  "payload": {
    "commands": [
      {
        "ids": ["light.ceiling_lights"],
        "status": "SUCCESS",
        "states": {
          "online": true,
          "brightness": 70,
          "on": true,
          "color": {
            "spectrumHsv": {
              "hue": 56,
              "saturation": 0.86,
              "value": 0.7058823529411765
            },
            "temperatureK": 2631
          }
        }
      }
    ]
  },
  "intent": "action.devices.EXECUTE"
}