hyslopc opened a new issue, #1896:
URL: https://github.com/apache/plc4x/issues/1896
### What happened?
**Current behavior:** An OPC-UA subscription request with N tags will return
a collection of N identical PlcSubscriptionHandles. Registering a handler for
all of these handles will result in N callbacks for every tag. Registering a
handler for just one of these handles and ignoring all of the others will
result in one callback for every tag change.
**Expected behavior:** Registering a handler for every subscription handle
returned by a subscription request (as described in the documentation,
literally a copy/paste of the example from the PLC4X docs) should result in a
single callback to the handler for every tag change, not multiple callbacks.
In order to achieve this, either the subscription request should return one
single PlcSubscriptionHandle, or N unique PlcSubscriptionHandles.
**Example showing the problem:**
```
PlcSubscriptionRequest subReq = opcConnector.subscriptionRequestBuilder()
.addChangeOfStateTagAddress("Weight", "Weight")
.addChangeOfStateTagAddress("Jam", "Jam")
.addChangeOfStateTagAddress("HeightAlarm", "HeightAlarm")
.build();
Collection<PlcSubscriptionHandle> shs =
subReq.execute().get().getSubscriptionHandles();</code>
```
After the above code is executed, shs now contains 3 identical
PlcSubscriptionHandles. If 3 more tags were to be added to the subscription
request, then shs would contain 6 identical PlcSubscriptionHandles.
### Version
v0.13.0
### Programming Languages
- [X] plc4j
- [ ] plc4go
- [ ] plc4c
- [ ] plc4net
### Protocols
- [ ] AB-Ethernet
- [ ] ADS /AMS
- [ ] BACnet/IP
- [ ] CANopen
- [ ] DeltaV
- [ ] DF1
- [ ] EtherNet/IP
- [ ] Firmata
- [ ] KNXnet/IP
- [ ] Modbus
- [X] OPC-UA
- [ ] S7
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