gekitchen 0.2.20

Python SDK for GE Kitchen Appliances

gekitchen

Python SDK for GE WiFi-enabled kitchen appliances. The primary goal is to use this to power integrations for Home Assistant, though that will probably need to wait on some new entity types.

Installation

pip install gekitchen

Usage

Simple example

Here we're going to run the client in a pre-existing event loop. We're also going to register some event callbacks to update appliances every five minutes and to turn on our oven the first time we see it. Because that is safe!

import aiohttp
import asyncio
import logging
from gekitchen.secrets import USERNAME, PASSWORD
from gekitchen import GeWebsocketClient

_LOGGER = logging.getLogger(__name__)


if __name__ == "__main__":
    logging.basicConfig(level=logging.DEBUG, format='%(levelname)-8s %(message)s')

    loop = asyncio.get_event_loop()
    client = GeWebsocketClient(loop, USERNAME, PASSWORD)

    session = aiohttp.ClientSession()
    asyncio.ensure_future(client.async_get_credentials_and_run(session), loop=loop)
    loop.run_until_complete(asyncio.sleep(60))

    for appliance in client.appliances:
        print(appliance)

Authentication

The authentication process has a few steps. First, for both the websocket and XMPP APIs, we use Oauth2 to authenticate to the HTTPS API. From there, we can either get a websocket endpoint with access_token or proceed with the XMPP login flow. For XMPP, we get a mobile device token, which in turn be used to get a new Bearer token, which, finally, is used to get XMPP credentials to authenticate to the Jabber server. In gekitchen, going from username/password to XMPP credentials is handled by do_full_xmpp_flow(username, password).

Useful functions

do_full_xmpp_flow(username, password)

Function to authenticate to the web API and get XMPP credentials. Returns a dict of XMPP credentials

do_full_wss_flow(username, password)

Function to authenticate to the web API and get websocket credentials. Returns a dict of WSS credentials

Objects

GeWebsocketClient(event_loop=None, username=None, password=None)

Main Websocket client

• event_loop: asyncio.AbstractEventLoop Optional event loop. If None, the client will use asyncio.get_event_loop()
• username/password Optional strings to use when authenticating

Useful Methods

• async_get_credentials(session, username=None, password=None) Get new WSS credentials using either the specified username and password or ones already set in the constructor.
• get_credentials(username=None, password=None) Blocking version of the above
• add_event_handler(event, callback) Add an event handler
• disconnect() Disconnect the client
• async_run_client() Run the client
• async_get_credentials_and_run(sessions, username=None, password=None) Authenticate and run the client

Properties

• appliances A Dict[str, GeAppliance] of all known appliances keyed on the appliances' JIDs.

Events

• EVENT_ADD_APPLIANCE - Triggered immediately after a new appliance is added, before the initial update request has even been sent. The GeAppliance object is passed to the callback.
• EVENT_APPLIANCE_INITIAL_UPDATE - Triggered when an appliance's type changes, at which point we know at least a little about the appliance. The GeAppliance object is passed to the callback.
• EVENT_APPLIANCE_STATE_CHANGE - Triggered when an appliance message with a new state, different from the existing, cached state is received. A tuple (appliance, state_changes) is passed to the callback, where appliance is the GeAppliance object with the updated state and state_changes is a dictionary {erd_key: new_value} of the changed state.
• EVENT_APPLIANCE_UPDATE_RECEIVED - Triggered after processing an ERD update message whether or not the state changed
• EVENT_CONNECTED - Triggered when the API connects, after adding basic subscriptions
• EVENT_DISCONNECTED - Triggered when the API disconnects
• EVENT_GOT_APPLIANCE_LIST - Triggered when we get the list of appliances

GeXmppClient(xmpp_credentials, event_loop=None, **kwargs)

Main XMPP client, and a subclass of slixmpp.ClientXMPP.

• xmpp_credentials: dict A dictionary of XMPP credentials, usually obtained from either do_full_login_flow or, in a more manual process, get_xmpp_credentials
• event_loop: asyncio.AbstractEventLoop Optional event loop. If None, the client will use asyncio.get_event_loop()
• **kwargs Passed to slixmpp.ClientXMPP

Useful Methods

• connect() Connect to the XMPP server
• process_in_running_loop(timeout: Optional[int] = None) Run in an existing event loop. If timeout is given, stop running after timeout seconds
• add_event_handler(name: str, func: Callable) Add an event handler. In addition to the events supported by slixmpp.ClientXMPP, we've added some more event types detailed below.

Properties

• appliances A Dict[str, GeAppliance] of all known appliances keyed on the appliances' JIDs.

Events

In addition to the standard slixmpp events, the GeClient object has support for the following:

• EVENT_ADD_APPLIANCE - Triggered immediately after a new appliance is added, before the initial update request has even been sent. The GeAppliance object is passed to the callback.
• EVENT_APPLIANCE_INITIAL_UPDATE - Triggered when an appliance's type changes, at which point we know at least a little about the appliance. The GeAppliance object is passed to the callback.
• EVENT_APPLIANCE_STATE_CHANGE - Triggered when an appliance message with a new state, different from the existing, cached state is received. A tuple (appliance, state_changes) is passed to the callback, where appliance is the GeAppliance object with the updated state and state_changes is a dictionary {erd_key: new_value} of the changed state.

GeAppliance(mac_addr, client)

Representation of a single appliance

• mac_addr: Union[str, slixmpp.JID] The appliance's MAC address, which is what GE uses as unique identifiers
• client: GeBaseClient The client used to communicate with the device

Useful Methods

• decode_erd_value(erd_code: ErdCodeType, erd_value: str) Decode a raw ERD property value.
• encode_erd_value(erd_code: ErdCodeType, erd_value: str) Decode a raw ERD property value.
• get_erd_value(erd_code: ErdCodeType) Get the cached value of ERD code erd_code. If erd_code is a string, this function will attempt to convert it to an ErdCode object first.
• async_request_update() Request the appliance send an update of all properties
• set_available() Mark the appliance as available
• async_set_erd_value(erd_code: ErdType, value) Tell the device to set the property represented by erd_code to value
• set_unavailable() Mark the appliance as unavailable
• update_erd_value(erd_code: ErdType, value) Update the local property cache value for erd_code to value, where value is the not yet decoded hex string sent from the API. Returns True if that is a change in state, False otherwise.
• update_erd_values(self, erd_values: Dict[ErdCodeType, str]) Update multiple values in the local property cache. Returns a dictionary of changed states or an empty dict if nothing actually changed.

Properties

• appliance_type: Optional[ErdApplianceType] The type of appliance, None if unknown
• available: bool True if the appliance is available, otherwise False
• mac_addr The appliance's MAC address (used as the appliance ID)

Useful Enum types

• ErdCode Enum of known ERD property codes
• ErdApplianceType Values for ErdCode.APPLIANCE_TYPE
• ErdMeasurementUnits Values for ErdCode.TEMPERATURE_UNIT
• ErdOvenCookMode Possible oven cook modes, used for OvenCookSetting among other things
• ErdOvenState Values for ErdCode.LOWER_OVEN_CURRENT_STATE and ErdCode.UPPER_OVEN_CURRENT_STATE

Other types

• OvenCookSetting A namedtuple of an ErdOvenCookMode and an int temperature
• OvenConfiguration A namedtuple of boolean properties representing an oven's physical configuration

API Overview

The GE SmartHQ app communicates with devices through (at least) three different APIs: XMPP, HTTP REST, and what they seem to call MQTT (though that's not really accurate). All of them are based around sending (pseudo-)HTTP requests back and forth. Device properties are represented by hex codes (represented by ErdCode objects in gekitchen), and values are sent as hexadecimal strings without leading "0x", then json encoded as a dictionary. One thing that is important to note is that not all appliances support every API.

1. REST - We can access or set most device properties via HTTP REST. Unfortunately, relying on this means we need to result to constantly polling the devices, which is less than desirable, especially, e.g., for ovens that where we want to know exactly when a timer finishes. This API is not directly supported.
2. Websocket "MQTT" - The WSS "MQTT" API is basically a wrapper around the REST API with the ability to subscribe to a device, meaning that we can treat it as (in Home Assistant lingo) IoT Cloud Push instead of IoT Cloud Polling. In gekitchen, support for the websocket API is provided by the GeWebsocketClient class.
3. XMPP - As far as I can tell, there seems to be little, if any, benefit to the XMPP API except that it will notify the client if a new device becomes available. I suspect that this can be achieved with websocket API as well via subscriptions, but have not yet tested. Support for the XMPP API is provided by the GeXmppClient class, based on slixmpp, which it requires as an optional dependency.

XMPP API

The device informs the client of a state change by sending a PUBLISH message like this, informing us that the value of property 0x5205 (ErdCode.LOWER_OVEN_KITCHEN_TIMER in gekitchen) is now "002d" (45 minutes):

<body>
    <publish>
        <method>PUBLISH</method>
        <uri>/UUID/erd/0x5205</uri>
        <json>{"0x5205":"002d"}</json>
    </publish>
</body>

Similarly, we can set the timer to 45 minutes by POSTing to the same "endpoint":

<body>
    <request>
        <method>POST</method>
        <uri>/UUID/erd/0x5205</uri>
        <json>{"0x5205":"002d"}</json>
    </request>
</body>

In gekitchen, that would handled by the GeAppliance.set_erd_value method:

appliance.async_set_erd_value(ErdCode.LOWER_OVEN_KITCHEN_TIMER, timedelta(minutes=45))

We can also get a specific property, or, more commonly, request a full cache refresh by GETing the /UUID/cache endpoint:

<body>
    <request>
        <id>0</id>
        <method>GET</method>
        <uri>/UUID/cache</uri>
    </request>
</body>

The device will then respond to the GET with a response having a json payload:

<body>
    <response>
        <id>0</id>
        <method>GET</method>
        <uri>/UUID/cache</uri>
        <json>{
            "0x0006":"00",
            "0x0007":"00",
            "0x0008":"07",
            "0x0009":"00",
            "0x000a":"03",
            "0x0089":"",
            ...
        }</json>
    </response>
</body>