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Home » Eclipse Projects » 4DIAC - Framework for Distributed Industrial Automation and Control » External event queue is full, external event dropped!
External event queue is full, external event dropped! [message #1863335] Sat, 27 January 2024 14:41 Go to next message
paulo nunes is currently offline paulo nunesFriend
Messages: 10
Registered: January 2024
Junior Member
Hello, i'm using an 1s E_CYCLE and a CLIENT_0_1 to read one opc_ua variable and the error "External event queue is full, external event dropped!" keeps appearing at fixed input events, ex.: with FORTE_EventChainExternalEventListSize = 10, the subscribe block freezes after 7 events in REQ and some time after, the error appears. with FORTE_EventChainExternalEventListSize = 100 the error shows after 50 events in REQ.

There is some way to fix this?

[Updated on: Sat, 27 January 2024 14:46]

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Re: External event queue is full, external event dropped! [message #1863395 is a reply to message #1863335] Wed, 31 January 2024 08:36 Go to previous messageGo to next message
Alois Zoitl is currently offline Alois ZoitlFriend
Messages: 1585
Registered: January 2014
Senior Member

As you can read in this thread https://www.eclipse.org/forums/index.php/t/1114282/ there seams to be an issue in opc ua client. Could this also be your prolbem?
Re: External event queue is full, external event dropped! [message #1863400 is a reply to message #1863395] Wed, 31 January 2024 12:15 Go to previous messageGo to next message
Ketut Kumajaya is currently offline Ketut KumajayaFriend
Messages: 24
Registered: January 2024
Junior Member
Using develop branch with my own patches here, no problems so far. Disconnection is normal in the real world but as a client FORTE always manages to reconnect to the remote OPC UA server. I set two device in two different location, one as publisher and one as subscriber, 8 tags. Quality of service only depend on network connection.
Re: External event queue is full, external event dropped! [message #1863438 is a reply to message #1863395] Fri, 02 February 2024 12:17 Go to previous message
paulo nunes is currently offline paulo nunesFriend
Messages: 10
Registered: January 2024
Junior Member
I don't think it's the same issue, as i'm using open62541 v1.0 without security and my communication works for some time, dropping after a fix amount of events. Probably it's some setting regarding the RTOS, because i'm using the FORTE machine on esp32. I will try to adjust the settings and will give a feedback here if it works.


EDIT: Apparently, there is no issue when i use SUBSCRIBE function with subscribe block, which i think is a better solution than a client block with e_cycle.

[Updated on: Mon, 12 February 2024 15:26]

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