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Sample nest thermostate
This is a sample implementation of a read-only integration of the Nest into Openhab. Here's the recipe:
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get a developer account @ https://developer.nest.com/ and create a client registration:
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Copy the authorization URL and open it in a new browser. Use your Nest login to approve the request. Once approved, you will get a "pincode".
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I used curl, but there are other tools out there to do an http post. In the "Access Token URL", replace the "AUTHORIZATION_CODE" with the pincode from step 2.
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curl --data 'code=AUTH_CODE&client_id=CLIENT_ID&client_secret=CLIENT_SECRET&grant_type=authorization_code' https://api.home.nest.com/oauth2/access_token
{"access_token":"[big long random string]","expires_in":315360000}
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We're done! The above access_token will give you access to the api for the next 10 years :-)
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To test, open the following url in your browser: https://developer-api.nest.com/devices/thermostats?auth=[big long random string from step 4]
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A json structure should be returned with all your devices. Get the "device_id" for your thermostat.
now in the openHAB world:
Items:
Number curNestTemp "Nest [%.1f F]" (Weather_Chart,gFF) { http="<[nest:60000:JS(GetNestValue.js)]"}
Number curNestTargetTemp "Nest Target [%.1f F]" (Weather_Chart,gFF) { http="<[nest:60000:JS(GetNestTargetValue.js)]"}
openhab.cfg:
############################### HTTP Binding ##########################################
http:nest.url=https://developer-api.nest.com/devices/thermostats/[DEVICE_ID from step 7]?auth=[big long random string from step 5]
http:nest.updateInterval=60000
GetNestValue.js:
JSON.parse(input).ambient_temperature_f;
GetNestTargetValue.js:
JSON.parse(input).target_temperature_f;
Simple! Now, every minute the current thermostat and target temperatures are refreshed. You can easily read any of the other properties of the thermostat as described here: https://developer.nest.com/documentation/api-reference.
For active control over the thermostat, see this discussion: https://groups.google.com/forum/#!topic/openhab/0u1t3xyZlqk An implementation might be available soon.
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