Eclipse Community Forums: 4DIAC - Framework for Distributed Industrial Automation and Control

Home » Eclipse Projects » 4DIAC - Framework for Distributed Industrial Automation and Control » Issue with FB SUBSCRIBE (FB SUBSCRIBE isn't working after communication break between two devices)

Issue with FB SUBSCRIBE [message #1809503]

Wed, 17 July 2019 01:50

Eclipse User

Using the 4DAIC v1.10.2, I have created application using PUBLISH_0 and SUBSCRIBE_0 FBs and executing scheme in two different Linux machines.

On start-up both are communicating properly for example Device 1 publishing messages and device 2 is subscribing the published message.

However, If I break Ethernet link by removing Ethernet cable between two device and reconnect again in this condition, Publish FB is working ok But Subscribe FB is not receiving the messages, I can see device1 published message on wire-shark but Subscribe FB is not receiving it.

Can anyone please help on this?

Re: Issue with FB SUBSCRIBE [message #1809567 is a reply to message #1809503]

Thu, 18 July 2019 06:13

Eclipse User

Hmh. The problem could be that on re-connection no IGMP join membership is sent again. Or maybe something in the UDP/IP stack of your OS is not recreated again. The problem is that currently we have no means to detect such situations. I think the only option you have is to add some kind of watchdog timer (e.g., E_RDELAY) and on time out de-initialise/re-initialise it.

Previous Topic:	"External event queue is full, external event dropped!" in forte console
Next Topic:	Terminated for publisher and subscriber

Goto Forum:

-=] Back to Top [=-

Current Time: Sat Jul 12 11:22:54 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter