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alleviate HC2 pressure for high number of API calls


Question

HI,

I am implementing an OpenRemote interface and may have come across an issue.

 

All sensors in OR poll constantly according to what has been has been configured

A sensor in OR is a way to read back the status of any device. The polling rate for a switch needs to be 1 second so you can see the status has changed when it is clicked.

This creates a possible problem

Multiply x 100 devices and you get a lot of API calls just to keep OR functional. I have noticed an increasing use of memory since I started implementing OR

 

This surfaces two issues in my mind

 

Do we know how many API calls (per second, per minute) that the HC can hanndle

If I am close to the threshold or prove that it is becomming an issue, would a slave HCl alleviate this stress ?

 

Thanks

Frank 

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pull (or polling) is never a good strategy in these cases. I would go for a script that fires on device change then notifies OpenRemote

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  • pull (or polling) is never a good strategy in these cases. I would go for a script that fires on device change then notifies OpenRemote

     

    thanks  - unfortunately polling in central to the way the OR works if you want feedback to the panel

    I have a lot of their sensors (that leverage polling) running and no adverse effects yet. I'm also using prime numbers in the polling intervals to prevent a lot of concurrent api calls

     

    I was just wondering if any had pushed close to the API request limit of the HC2

     

    -F

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    I am no expert and lacks insight to the system to deep dive analyse its behaviours.

     

    Based on observations over 1+ year, I believe Home Center 2 itself is more than capable to handle a high volume to API calls (been using ImperiHome w/o issue). The crucial part to consider is the load on the 'z-wave traffic/layer' where I found the z-wave layer to be the bottleneck for almost all the teething issues (such as delayed scenes).

     

    Most times when scenes get delayed, it seems there is some other command/traffic on the z-wave layer pending to timeout or finish, then suddenly a series of scenes get actioned on. Example: I have three separate smart light scenes for each aisle, common bathroom and kitchen but has dependencies among them. When I walk down the aisle and if the common bathroom and kitchen lights are off, it lights up the aisle's light. Once I step into either common bathroom or kitchen, it will switch off the aisle's light if it is on. Based on this interdependent light scenes, I have observed that when there is a delay in scenes, it usually pause for xx seconds (or sometimes up to 1-2 mins) before the sequence of how lights supposed to switch on or off being actioned on suddenly. That is an indication where z-wave layer is busy, subsequent scenes get queued in the order they are supposed to but just not being actioned on due to z-wave layer still pending prior command to complete or timeout and get killed.

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  • I am no expert and lacks insight to the system to deep dive analyse its behaviours.

     

    Based on observations over 1+ year, I believe Home Center 2 itself is more than capable to handle a high volume to API calls (been using ImperiHome w/o issue). The crucial part to consider is the load on the 'z-wave traffic/layer' where I found the z-wave layer to be the bottleneck for almost all the teething issues (such as delayed scenes).

     

    Most times when scenes get delayed, it seems there is some other command/traffic on the z-wave layer pending to timeout or finish, then suddenly a series of scenes get actioned on. Example: I have three separate smart light scenes for each aisle, common bathroom and kitchen but has dependencies among them. When I walk down the aisle and if the common bathroom and kitchen lights are off, it lights up the aisle's light. Once I step into either common bathroom or kitchen, it will switch off the aisle's light if it is on. Based on this interdependent light scenes, I have observed that when there is a delay in scenes, it usually pause for xx seconds (or sometimes up to 1-2 mins) before the sequence of how lights supposed to switch on or off being actioned on suddenly. That is an indication where z-wave layer is busy, subsequent scenes get queued in the order they are supposed to but just not being actioned on due to z-wave layer still pending prior command to complete or timeout and get killed.

     

     

    thanks chaicka
     
    I hope you're right and what I have built using OpenRemote seems good.
    I'll be writing a post on it as soon as it is presentable.

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    /emoticons/default_icon_smile.gif" alt=":-)" />
    I also came across a sonos http api (that host in the same place as the Openremote controller) and it give a huge amount of control over the zones, down grouping and ungrouping.
    check out NODE SONOS HTTP API at the following url if you're interested

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    Rgds
    -F
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    Cool... even has experimental support for Apple Music.

     

    The power of coding... 

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    /emoticons/default_icon_biggrin.gif" alt=":-D" />

     

    Thanks Frank.

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