[Help] Tag does not match mandatory sequence component.

[danilocgraciano]

Hi,

Could someone help me with the exception below? I followed the examples and tested using IED Explorer.

Using com.beanit.iec61850bean.clientgui.ClientGui everything works.

`16:55:53.204 [iec61850bean-server-thread-1] DEBUG com.beanit.iec61850bean.ServerAssociation - Connection was closed by client.

16:56:03.533 [iec61850bean-server-thread-1] WARN com.beanit.iec61850bean.ServerAssociation - IOException decoding received MMS request PDU.
java.io.IOException: Tag does not match mandatory sequence component.
at com.beanit.iec61850bean.internal.mms.asn1.ConfirmedRequestPDU.decode(ConfirmedRequestPDU.java:112)
at com.beanit.iec61850bean.internal.mms.asn1.MMSpdu.decode(MMSpdu.java:209)
at com.beanit.iec61850bean.ServerAssociation.listenForMmsRequest(ServerAssociation.java:450)
at com.beanit.iec61850bean.ServerAssociation.handleConnection(ServerAssociation.java:248)
at com.beanit.iec61850bean.ServerAssociation.handleNewAssociation(ServerAssociation.java:155)
at com.beanit.iec61850bean.ServerSap.connectionIndication(ServerSap.java:307)
at com.beanit.iec61850bean.AcseListener.connectionIndication(AcseListener.java:31)
at com.beanit.josistack.ServerAcseSap.connectionIndication(ServerAcseSap.java:119)
at com.beanit.jositransport.ServerThread$ConnectionHandler.run(ServerThread.java:144)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)`

Please look at this picture:
https://github.com/danilocgraciano/iec-server/blob/master/ied_explorer.png

And this is the repo: https://github.com/danilocgraciano/iec-server

Thanks.

[pavel-ch]

There are several issues identified using IedExplorer with iec61850bean server, all are linked to the missing implementations in iec61850bean library:

1. missing implementation of "identify" combined with a wrong announcement of implementing it (see InitiateResponsePDU: "identify" support mismatch #22 ). This generates a stack trace but does not prevent communication.

2. Read request: iec61850bean does not implement Read request with SpecificationWithResult = True; in that case the association is closed
   

3. read request: iec61850bean does not support reading at FC level (used by IedExplorer on startup) like this:
   

although it is completely legal in MMS.

In IedExplorer, reading values at startup can be switched OFF:

But the 2) point prevents using the IedExplorer in the current version.

[pavel-ch]

There is a new IedExplorer release to allow the above reading / Service release 0.79m 2021/04/27
You have to switch OFF Read Values and With Spec.
You must read values of interest by hand from the context menu.