Nest Status

[Shyam]

Hi,

The Nest functionality in Domoticz is great! There's one thing which I can't find. Basically when you set a temperature on the Nest, the Nest screen turns Red and then back to normal once the desired temperature is reached. Is there a way to know this status? Reason for asking is that I have some led strips, and would like to mimic this functionality with the LED strip.

[dcnoren]

Any update on this? I'd really like this functionality, as well.

[Delaroyas]

That is a Feature I would also like.

[Delaroyas]

There is a readable parameter in the official Nest api:

hvac_state

Indicates whether HVAC system is actively heating, cooling or is off.
Use this value to indicate HVAC activity state.

typestring enum
values: "heating", "cooling", "off"
considerations: When "off", the HVAC system is not actively heating or cooling.
hvac_state is independent of fan operation.

https://developer.nest.com/documentatio ... #hvacstate

On stackoverflow I read this feature is working since May 2015 (it was a constant value before).

I guess it is only a question of implementing it.

[Delaroyas]

I guess it is only a question of implementing it.

Hum... I've looked at the code on github, and it seems I'm not as good a programmer has I thought.
I found the nest.cpp code and nest.h in the hardware folder, but I can't seem to find the specific code that currently gets the parameters already available in the interface.
I've searched the project code and could not find a reference to "ambient_temperature" which is the official NEST API name for the current_temperature in domotics (available in the Temp + Humidity "TempHum" Nest device in the Domotics Interface).

[Delaroyas]

There is a readable parameter in the official Nest api:
hvac_state
Indicates whether HVAC system is actively heating, cooling or is off.
Use this value to indicate HVAC activity state.

I posted an issue on github and got an answer:

I dont see this hvac_state value in the json output

The JSON output he gets is totally different than what is documented in the Official API....

To be continued...

[confucius]

Hi Delaroyas,

seems the code is pulling the status from a wrong location (mobile web address), this should be https://developer-api.nest.com

[Delaroyas]

Hi Delaroyas,

seems the code is pulling the status from a wrong location (mobile web address), this should be https://developer-api.nest.com

Just started to fiddle around with the cpp code this week. Managed to get the JSON printed on the standard output. I wasn't able to use the address you suggested to login...

Domoticz is not using the Official API, and I don't think it would be necessary nor a good idea...

Anyway, the JSON I got is different than what gizmocuz showed me on Git Hub. An it has 3 interesting parameters:
hvac_heater_state, hvac_aux_heater_state, hvac_heat_x2_state,

There is also hvac_ac_state, for those who have AC plugged in on the Nest.

In the code, I just don't know how to create a device on the Nest hardware and how to send data to it...

[Delaroyas]

With some help from gizmocuz I managed to modify nest.cpp to add the functionality so greatly desired!

Currently only supports basic heating/cooling logging into a "switch" device (kind of like the away switch).

Created a pull request on GitHub, hopes the code is clean enough to gett pulled in and compiled in the next beta update!

Will post again here when the update is out.

[Delaroyas]

The code was accepted and included, the latest beta has the Nest "status" feature.

On the device menu, you should have a new "lighting 2" device called "HeatingOn" and/or "CoolingOn" depending on your Nest functionality.
(No need to remove/add your Nest in the hardware tab).

Use the green arrow to include the device. It will then appear in your Switches tab.