Homebridge Nest Accfactory

Formally known as Nest_accfactory, this is a Homebridge plugin I have developed to allow Nest devices to be used with HomeKit including having support for HomeKit Secure Video on doorbells and camera devices

Supported Devices

The following Nest devices are known to be supported

• Nest Thermostats (1st gen, 2nd gen, 3rd gen, E, 2020 mirror edition, 4th gen)
• Nest Protects (1st and 2nd gen)
• Nest Temp Sensors (1st gen)
• Nest Cameras (Cam Indoor, IQ Indoor, Outdoor, IQ Outdoor, Cam with Floodlight)
• Nest Doorbells (wired 1st gen)

The accessory supports connection to Nest using a Nest account OR a Google (migrated Nest account) account.

Configuration

Nest Account

If you have a Nest account, you will need to obtain an access token from the Nest web app. Simply go to https://home.nest.com in your browser and log in. Once that's done, go to https://home.nest.com/session in your browser, and you will see a long string that looks like this:

{"2fa_state":"enrolled","access_token":"XXX", ...}

The value of "access_token" near the start of the string (the XXX) (a long sequence of letters, numbers and punctuation beginning with b) can be entered into the plugin-configuration within Homebridge

There may be other keys labelled access_token further along in the string - please ignore these.

Do not log out of home.nest.com, as this will invalidate your credentials. Just close the browser tab

Obtaining a Google cookie token for a Google Account

Google Accounts require an "issueToken" and "cookie". The values of "issueToken" and "cookies" are specific to your Google Account. To get them, follow these steps (only needs to be done once, as long as you stay logged into your Google Account).

1. Open a Chrome browser tab in Incognito Mode (or clear your cache).
2. Open Developer Tools (View/Developer/Developer Tools).
3. Click on 'Network' tab. Make sure 'Preserve Log' is checked.
4. In the 'Filter' box, enter issueToken
5. Go to home.nest.com, and click 'Sign in with Google'. Log into your account.
6. One network call (beginning with iframerpc) will appear in the Dev Tools window. Click on it.
7. In the Headers tab, under General, copy the entire Request URL (beginning with https://accounts.google.com). This is your "Issue Token" which can be entered into the plugin-configuration within Homebridge.
8. In the 'Filter' box, enter oauth2/iframe
9. Several network calls will appear in the Dev Tools window. Click on the last iframe call.
10. In the Headers tab, under Request Headers, copy the entire cookie (include the whole string which is several lines long and has many field/value pairs - do not include the cookie: name). This is your "Cookie" which can be entered into the plugin-configuration within Homebridge.

Do not log out of home.nest.com, as this will invalidate your credentials. Just close the browser tab

config.json configuration

When using the plugin configuration using homebridge-config-ui-x, the config.json will be updated/generated with the configuration options available via the web-form. Additional options can be specified in the config.json directly.

Sample config.json entries below

{
    "nest": {
        "access_token": "<nest access token>",
        "fieldTest": false
    },
    "google": {
        "issuetoken": "<google issue token>",
        "cookie": "<google cookie>",
        "fieldTest": false
    },
    "options": {
        "eveHistory": true,
        "weather": true,
        "elevation": 600,
        "hksv": false
    },
    "devices": {
        "XXXXXXXX": {
            "exclude": false
        },
    },
    "platform": "NestAccfactory"
}

options

The following options are available in the config.json options object. These apply to all discovered devices.

Name	Description	Default
elevation	Height above sea level for the weather station	0
eveHistory	Provide history in EveHome application where applicable	true
ffmegPath	Path to an ffmpeg binary for us to use. Will look in current directory by default
hksv	Enable HomeKit Secure Video for supported camera(s) and doorbell(s)	false
maxStreams	Maximum number of concurrent video streams in HomeKit for supported camera(s) and doorbell(s)	2
weather	Virtual weather station for each Nest/Google home we discover	false

devices

The following options are available on a per-device level in the config.json devices object. The device is specified by using its serial number (in uppercase)

Name	Description	Default
chimeSwitch	Create a switch for supported doorbell(s) which allows the indoor chime to be turned on/off	false
doorbellCooldown	Time in seconds between doorbell press events	60
elevation	Height above sea level for the specific weather station	0
eveHistory	Provide history in EveHome application where applicable for the specific device	true
exclude	Exclude the device	false
humiditySensor	Create a seperate humidity sensor for supported thermostat(s)	false
localAccess	Enable local video streaming for supported supported camera(s) and doorbell(s)	false
motionCooldown	Time in seconds between detected motion events	60
personCooldown	Time in seconds between detected person events	120

Caveats

homebridge-nest-accfactory and Nest_accfactory are both hobby projects of mine, provided as-is, with no warranty whatsoever. I've been running it successfully at my home, but your mileage might vary. If you do find an issue, please reachout and see what we can do