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Problem in communication Publish/Subscribe [message #1741864]

Tue, 30 August 2016 09:23

Michele Citro

Messages: 29
Registered: June 2016

Junior Member

Hi,

I want report an error in the communication Publish/Subscribe in my distribuited application (on 3 device).

I explain the problem better.
1. I have to publish the event CONTATTA_ZONAA on 225.0.0.1:61341 (in the attachement ZonaB).

2. This event, published, isn't received from PRONTA_ZONAB in 225.0.0.1:61341 (in the attachement ZonaA). But socket status is ok.

So, I tried to change ip and port also but nothing good result.

3. So, I tried to receive this event on another device (in the attachement ZonaC_trial) on 225.0.0.1:61341 always, and it's ok there.

Another trial:
4. I tried to receive this event on the same device of Publish (in the attachement ZonaB_trial) on 225.0.0.1:61341, and it's ok there.

Thus, in my opinion, the problem is on the device ZonaA.

What could be the problem?

Thank you.

Best regards,
Michele Citro

Attachment: ZoneA.png
(Size: 82.10KB, Downloaded 137 times)
Attachment: ZoneB.png
(Size: 61.06KB, Downloaded 128 times)
Attachment: ZoneB_trial.png
(Size: 70.10KB, Downloaded 125 times)
Attachment: ZoneC_trial.png
(Size: 62.79KB, Downloaded 130 times)

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Re: Problem in communication Publish/Subscribe [message #1741865 is a reply to message #1741864]

Tue, 30 August 2016 09:27

Martin Melik Merkumians

Messages: 117
Registered: March 2016

Senior Member

What does your network topology looks like? Is there a router in between Device A and the other devices, or are all connected on the same switch?

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Re: Problem in communication Publish/Subscribe [message #1741869 is a reply to message #1741865]

Tue, 30 August 2016 09:53

Michele Citro

Messages: 29
Registered: June 2016

Junior Member

Hi Martin,

my network topology is composed by an only router, and every device connected on the same.

I precise that in my application I have other communications of this kind (i.e between 3 device) and I have no problem.
In the attachement I show my architecture 4DIAC-IDE.

BR,
Michele Citro

Attachment: Architettura_4DIAC.jpg
(Size: 40.80KB, Downloaded 127 times)

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Re: Problem in communication Publish/Subscribe [message #1741872 is a reply to message #1741869]

Tue, 30 August 2016 10:45

Alois Zoitl

Messages: 1581
Registered: January 2014

Senior Member

Hi,

this is strange. My question for the other communication is are these mulitcast or point to point connections? Because I see that you are using addresses starting with 224 which is to my knowledge no multicast address. Or am I missing something. If this is the case what kind of devices are you using? RaspberryPIs? On these you often have to activate multicast routing so that multicast packets are sent over the network.

BR,
Alois

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Re: Problem in communication Publish/Subscribe [message #1741874 is a reply to message #1741872]

Tue, 30 August 2016 11:11

Michele Citro

Messages: 29
Registered: June 2016

Junior Member

Hi,

I explain better.
The other communication are multicast on 224.0.0.0:port always, for this case I used to try ip address 225.0.0.1:port. But it doesn't work anyway.

But, such I read in http://www.eclipse.org/4diac/en_help.php section "Using Communication Protocols-->FBDK/IP-->Publish/Subscribe-UDP/IP" that :

" Multicast IP addresses can be picked from the range 224.0.0.0 - 239.255.255.255, while the port is arbitrary", so 224 should be multicast.

Anyway, I am using Hilscher' boards (i.e. CIFX 50-DP, installed on the devices) and communicated in Profibus with my automated warehouse.

BR,
Michele CItro

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Re: Problem in communication Publish/Subscribe [message #1741881 is a reply to message #1741864]

Tue, 30 August 2016 11:39

Gerhard Ebenhofer

Messages: 4
Registered: November 2015

Junior Member

Hi,

I'm a bit confused why you have between 2000 and 3000 Init Events on the Publish/Subscribe FBs - can you check that?

Was the second Subscribe FB initialized, before the Event was published?

Regards,

Gerhard

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Re: Problem in communication Publish/Subscribe [message #1741900 is a reply to message #1741881]

Tue, 30 August 2016 14:04

Michele Citro

Messages: 29
Registered: June 2016

Junior Member

Hi,

you are right. It was a mistake, because I linked some Publish/subscribe's inizialization with a wrong event.

Now, after correction, Publish/SUbscribe FB are inizialized one time.

But the problem on this socket remains.

I'm sure that Subscribe FB's initialization isn't before the Event published,
because I link the first socket (on every device) with E_RESTART FB and this first socket initializes all other.
I show this in the attachement.

Best regard,
Michele Citro

Attachment: Init socket.png
(Size: 14.83KB, Downloaded 124 times)

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Re: Problem in communication Publish/Subscribe [message #1741914 is a reply to message #1741900]

Tue, 30 August 2016 14:40

Alois Zoitl

Messages: 1581
Registered: January 2014

Senior Member

Have you tried to use another ip in the 224 range as this range seems to be working. E.g., 224.0.0.64?

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Re: Problem in communication Publish/Subscribe [message #1741926 is a reply to message #1741914]

Tue, 30 August 2016 15:36

Michele Citro

Messages: 29
Registered: June 2016

Junior Member

Yes,
I tried with others ip and port, but nothing.

I'm starting to think that the problem isn't this. But what other could it be?

BR,
Michele Citro

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Re: Problem in communication Publish/Subscribe [message #1741948 is a reply to message #1741864]

Tue, 30 August 2016 17:54

Gerhard Ebenhofer

Messages: 4
Registered: November 2015

Junior Member

I'm not sure whether I correctly understand the following sentence:
"I'm sure that Subscribe FB's initialization isn't before the Event published,
because I link the first socket (on every device) with E_RESTART FB and this first socket initializes all other."

Does this mean that you are starting the device (and deploying the FB Network) with the Subscribe FB before you start (and deploy the FB Network) of the publishing device and publishing the event?

Have you tried to use the "Trigger Event" functionality to send the event a second time after all publish/subscribe FBs are initialized?

Gerhard

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Re: Problem in communication Publish/Subscribe [message #1742788 is a reply to message #1741948]

Wed, 07 September 2016 15:05

yuvaraj velumani

Messages: 15
Registered: April 2016

Junior Member

If possible, try to look the run time log or trace. There may be possibility of dropping the events since Forte is only capable of storing 254 events in it queue.
Or else there may be a chance of Publish happening before the Subscribe function block getting initialized.
Other option that you could try out is complete all subscribe initialization after E_RESTART and then start you application by connection the last Subscribe function block INITO.

As suggested by Gerhard, you can try with "Trigger Event" also

[Updated on: Wed, 07 September 2016 15:06]

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