kepserver data event

[freeopcua]

kepserver data event

[oroulet]

Look at subscription in example client. Let me know if it works with kepware

On Wed, Jul 1, 2015, 07:53 kashp [email protected] wrote:

Hi oroulet
I am connecting kepserver with python using python-opcua
I am polling the server for tag value change, Is there any event
registration mechanism so that my python function triggered automatically
as the tag value will change

Thanks

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#11.

[kashp]

Thanks oroulet its working thanks,
I have one more doubt, lets suppose i have registered 180 tags
like this
sub.subscribe_data_change(myvar)

data_change(self, handle, node, val, attr) will be executed upon event receive.
If all tags changed then this function will be called in parallel or sequential
????

[oroulet]

In current implementation there is only one thread calling callbacks so all
calls will be sequential s. One could implement a thread pool but in
python, which is anyway monoprocess, I am not sure it would help anything

On Thu, Jul 2, 2015, 07:40 kashp [email protected] wrote:

Thanks oroulet its working thanks,
I have one more doubt, lets suppose i have registered 180 tags
like this
sub.subscribe_data_change(myvar)

data_change(self, handle, node, val, attr) will be executed upon event
receive.
If all tags changed then this function will be called in parallel or
sequential
????

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#11 (comment)
.

[oroulet]

One planned improvement is to allow subscriptions to many tags at once...
But not done yet

On Thu, Jul 2, 2015, 13:49 Olivier Roulet-Dubonnet [email protected]
wrote:

In current implementation there is only one thread calling callbacks so
all calls will be sequential s. One could implement a thread pool but in
python, which is anyway monoprocess, I am not sure it would help anything

On Thu, Jul 2, 2015, 07:40 kashp [email protected] wrote:

Thanks oroulet its working thanks,
I have one more doubt, lets suppose i have registered 180 tags
like this
sub.subscribe_data_change(myvar)

data_change(self, handle, node, val, attr) will be executed upon event
receive.
If all tags changed then this function will be called in parallel or
sequential
????

—
Reply to this email directly or view it on GitHub
#11 (comment)
.