Avatar

Please consider registering
guest

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
sp_Search Search
Advanced Search
Advanced Search

— Forum Scope —




— Match —





— Forum Options —





Minimum search word length is 3 characters - maximum search word length is 84 characters

sp_Search Search
Go to Bottom
No permission to create posts
sp_Feed Topic RSS sp_TopicIcon
Hello, onDataChange method notification occurs when nodes are subscribed.
April 21, 2015
14:09, EEST
Avatar
seong
Member
Members
Forum Posts: 6
Member Since:
March 31, 2015
sp_UserOfflineSmall Offline
Go to Top
1sp_Permalink sp_Print

Dear Sir/Madam,

I have been using(testing) Prosys OPC client Java SDK with a great pleasure.

I found out that onDataChange method notifies even at the moment when nodes are subscribed.

I expect that I would get notifications ‘only’ when subscribed node change their state.

I need to send nodes when they change their state but my program notifies every node that I subscribed when the program is initialised.
I only need to send nodes which changed their states.

Do you provide a method or a class (an interface) for this specific purpose?

If you can advise me on this issue, I will be very grateful.

Wish you a lovely day :)

Thank you

Kind regards

Seong

April 22, 2015
14:00, EEST
Avatar
Jouni Aro
Moderator
Moderators
Forum Posts: 1010
Member Since:
December 21, 2011
sp_UserOfflineSmall Offline
sp_UserWebsite
Go to Top
2sp_Permalink sp_Print

Unfortunately, this is not easily possible: the server will send notifications of all initial values to the client when the subscription is created.

You will need to find out how to skip these initial values in your application, for example based on the timestamp values(?) or something else.

April 22, 2015
18:37, EEST
Avatar
seong
Member
Members
Forum Posts: 6
Member Since:
March 31, 2015
sp_UserOfflineSmall Offline
Go to Top
3sp_Permalink sp_Print

Hi Jouni,

Thank you for your kind message.

I understand, I shall find ways to skip first data.

Thank you,

Kind regards

Seong

No permission to create posts
sp_Feed All RSS
Go to top
Forum Timezone: Europe/Helsinki

Most Users Ever Online: 518

Currently Online:
15 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

hbrackel: 135

pramanj: 86

Francesco Zambon: 81

rocket science: 77

Ibrahim: 76

Sabari: 62

kapsl: 57

gjevremovic: 49

Xavier: 43

fred: 41

Member Stats:

Guest Posters: 0

Members: 683

Moderators: 16

Admins: 1

Forum Stats:

Groups: 3

Forums: 15

Topics: 1467

Posts: 6261

Newest Members:

digitechroshni, LouieWreve, Kickbiche, karrimacvitie5, graciela2073, sagarchau, elviralangwell4, Donnavek, Eddiefauth, DonaldPooma

Moderators: Jouni Aro: 1010, Otso Palonen: 32, Tuomas Hiltunen: 5, Pyry: 1, Petri: 0, Bjarne Boström: 983, Heikki Tahvanainen: 402, Jukka Asikainen: 1, moldzh08: 0, Jimmy Ni: 26, Teppo Uimonen: 21, Markus Johansson: 42, Niklas Nurminen: 0, Matti Siponen: 321, Lusetti: 0, Ari-Pekka Soikkeli: 5

Administrators: admin: 1