Monitoring / Subscription of multiple objects

[Ralalu]

Hi Luis

You could put multiple addresses in one subscription. I did it like this:

Note: I need the namespace 3. In your code, the value is fixed to value 2.

        public ushort namespaceIndex = 3;

        List<MonitoredItem> itemsMulti;
        public void MonitoringMultiInit()
        {
           itemsMulti = new List<MonitoredItem>();        
        }
        
        public void MonitoringMulti(string address, MonitoredItemNotificationEventHandler monitor)
        {
            MonitoredItem monitored = new MonitoredItem();
            monitored.StartNodeId = new NodeId(address, namespaceIndex);
            monitored.AttributeId = Attributes.Value;
            monitored.Notification += monitor;
            itemsMulti.Add(monitored);
        }

        public void MonitoringMultiExec(int miliseconds)
        {
            var subscription = this.Subscription(miliseconds);
            subscription.AddItems(itemsMulti);
            this.Session.AddSubscription(subscription);
            subscription.Create();
            subscription.ApplyChanges();
        }

How to use

client.MonitoringMultiInit();
 client.MonitoringMulti("Device.Counter.Value1", (_, e) => {
   // Anything you need to be executed when the value changes
 
   // Get the value of the tag being monitored
    var monitored = (MonitoredItemNotification)e.NotificationValue;
    Console.WriteLine(monitored.Value);
 });
 client.MonitoringMulti("Device.Counter.Value2", (_, e) => {
   // Anything you need to be executed when the value changes
 
   // Get the value of the tag being monitored
    var monitored = (MonitoredItemNotification)e.NotificationValue;
    Console.WriteLine(monitored.Value);
 });
//....... add up to 1000 for Siemens S7 PLC
client.MonitoringMultiExec(1000);

regards RaLa

[joc-luis]

Hi @Ralalu, if you want make a pull request for your changes, do not forget add an example in the README.md