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Re: [milo-dev] Connection and Subscription
Joe,

You shouldn't need more than 1 connection, but you may need more than 1 subscription. These limits will depend more on the server than anything else.

Once you've received the initial values the subscriptions are relatively lightweight for the client because you'll only be notified when a value changes. 

It's unlikely that you would be able to issue an explicit Read call for a million items without exceeding some kind of encoding or operation limit, however. You would need to batch any Read calls into multiple parts.

On Fri, May 24, 2019 at 1:47 AM Joe San <codeintheopen@xxxxxxxxx> wrote:
My question was what if this List contains a million or more items? I'm thinking about scale. So is this single OPC server can contain many different edge devices (sensors, iot devices) with each emitting say around 10 data points, so if I have my OPC server with 100000 of those sensors attached, this mounts to 1 million data points. Is this ideal to have 1 million datapoints subscribed with a single connection?


On Fri, May 24, 2019 at 9:14 AM Gattinger. Michael <m.gattinger@xxxxxxxxxxxx> wrote:

2.

As i understood you can provide a List of Items to Monitor…

See Line 166 in ReadExample.java on this E-Mail.

 

items = subscription.createMonitoredItems(TimestampsToReturn.Both, Arrays.asList(request), onItemCreated).get();

 

Von: milo-dev-bounces@xxxxxxxxxxx <milo-dev-bounces@xxxxxxxxxxx> Im Auftrag von Joe San
Gesendet: Freitag, 24. Mai 2019 07:42
An: milo developer discussions <milo-dev@xxxxxxxxxxx>
Betreff: [milo-dev] Connection and Subscription

 

I see from the examples on how to connect to a OPC UA server, but now I would like to know some more details on the connection and subscription!

 

1. How many connection instances do I need? Is this connection comparable to a JDBC connection? If so, should I create a connection pool?

 

2. How many items or data points can I subscribe with a single subscription?






     


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