can I get back some QAs property value using self?

[Neo Andersson 230]

Hi

Can i get back some property values of a quickapp device, using the instance object "self"?

 

Like

 

getting back a thermostat QA device setpoint i am using

 

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isnt there a shorter way, somehow using the self object?

 

same goes for other properties like value in case of switches, sensors etc

 

I am asking, becasue i read somewhere, that performance wise using the self object is quicker and having less impact on the system

[Alex de Bruin 21]

setpoint = self.properties.heatingThermostatSetpoint

[jgab 2,642]

Be careful with that. I usually treat the self.property as a cache...
The reason is that it is set when the QA starts up and is given the current device structure .properties value.
After that, the self.properties is only updated when we do a self:updateProperty(prop, value) (or an action that results in a self:updateProperty)
Are there other ways that the property can be updated? Well, in principle we can call the rest api to update the properties in ways that don't update the self.property.
I grant that it's not so common.

 

Anyway, if you are writing a thermostat you should keep that value in a local/instance variable anyway and update the property with self:updateProperty
There is really no reason to read the self.property for efficiency. 
At start/restart you read the value with getValue, and after that you get the new value user sets with the UI from the UI event (which you call self:updateProperty with)

Yes, hub.getValue(self.id, "heatingThermostatSetpoint") takes ~900 times longer time then self.properties.heatingThermostatSetpoint on a HC3,

the hub.getValue(self.id, "heatingThermostatSetpoint") still only takes ~1ms...

[Neo Andersson 230]

22 hours ago, jgab said:

Be careful with that. I usually treat the self.property as a cache...
The reason is that it is set when the QA starts up and is given the current device structure .properties value.
After that, the self.properties is only updated when we do a self:updateProperty(prop, value) (or an action that results in a self:updateProperty)
Are there other ways that the property can be updated? Well, in principle we can call the rest api to update the properties in ways that don't update the self.property.
I grant that it's not so common.

 

Anyway, if you are writing a thermostat you should keep that value in a local/instance variable anyway and update the property with self:updateProperty
There is really no reason to read the self.property for efficiency. 
At start/restart you read the value with getValue, and after that you get the new value user sets with the UI from the UI event (which you call self:updateProperty with)

Yes, hub.getValue(self.id, "heatingThermostatSetpoint") takes ~900 times longer time then self.properties.heatingThermostatSetpoint on a HC3,

the hub.getValue(self.id, "heatingThermostatSetpoint") still only takes ~1ms...

Well i was womdering if there are some methods (undiscovered by me), that avoid using api calls. For example, i want to know a device's role. I need to go for

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instead of self.deviceRole..

 

I brought up the "deviceRole" just as an example, the question goes for other properties too, that we usually get back only by using api calls. 

I don't know for sure, but i think getting back a devices propertie's values using hub.call(), or self.<whatever> should be many many times faster than getting back them from api calls. Thats why i am asking.

[Neo Andersson 230]

@jgabJan, if we do forexample self:updateProperty("model", "v1.0.1") in out onInit() function, doesn't it make an inifinit loop??
Isn't the updateProperty call restarts tha quckapp, and so it gets into an infinit loop??

[jgab 2,642]

2 minutes ago, Neo Andersson said:

@jgabJan, if we do forexample self:updateProperty("model", "v1.0.1") in out onInit() function, doesn't it make an inifinit loop??
Isn't the updateProperty call restarts tha quckapp, and so it gets into an infinit loop??

No, self:updateProperty don't restart the QA.

 

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do restart the QA