[Fiware-lab-help] Entity attributes

Josep Bacardit jbacardit at idp.es
Wed Mar 26 08:40:53 CET 2014

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Dear Fermín,

Yes, you are right.

I’ve added a comment supporting your issue in github.com.

Thanks for your support!

Keep in touch and best regards.

Josep Bacardit Alavedra
TÉCNICO - TECHNICAL ESPECIALIST ICT

IDP

Edificio Torre Milenium
Av. Francesc Macià, 60, 3a planta
08208 Sabadell (Barcelona)
Tel. 902 431 289
Fax 937 264 579
<mailto:jvanbreest at idp.es> jbacardit @idp.es
www.idp.es <http://www.idp.es/>

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De: Fermín Galán Márquez [mailto:fermin at tid.es]
Enviado el: martes, 25 de marzo de 2014 17:17
Para: Josep Bacardit
CC: fiware-lab-help at lists.fi-ware.eu
Asunto: Re: [Fiware-lab-help] Entity attributes

Dear Josep,

So, I'm understand that you need to keep track of a "custom" timestamp for
each one of the attributes of the entity, right?

A possible workaround (*) with the current version of Orion Context Broker
would be to have that timestamp as a separate attribute, associated to the
attribute to which it refers using some kind of naming criteria. Ej. if the
attribute storing the data is named "attr", then the timestamp associated to
it could be named "attr_timestamp".

Thus, if you have N "real" attributes, the NGSI entity will have 2*N
attributes at the end. If N is small (as usually is), this solution would
solve your case.

Best regards,

------
Fermín

(*) Another functionality that we have identified is about "custom"
attribute metadata. That would a "smarter" way of solving the same problem.
Please, if you think it would be an instereting feature to you, add a
comment supporting it in the following github.com issue:
https://github.com/telefonicaid/fiware-orion/issues/252. Thanks!

El 25/03/2014 17:05, Josep Bacardit escribió:

Dear Fermín,

Thanks for your quick response!

Yes, we are interested in this functionality.

In our case we would like to send to the context broker, the original
timestamp registered in the data source. Imagine that we have a problem in
the communications and we can’t send the information to the context broker.
So there will be some delay in the communication. In our api we continue
buffering data till the moment the communication will be reestablished. From
that moment, we would like to send the data with the original timestamp of
the reading and not with the timestamp of the update in the context broker.

Thanks and best regards.

Josep Bacardit Alavedra
TÉCNICO - TECHNICAL ESPECIALIST ICT

IDP

Edificio Torre Milenium
Av. Francesc Macià, 60, 3a planta
08208 Sabadell (Barcelona)
Tel. 902 431 289
Fax 937 264 579
<mailto:jvanbreest at idp.es> jbacardit @idp.es
www.idp.es <http://www.idp.es/>

De: Fermín Galán Márquez [mailto:fermin at tid.es]
Enviado el: martes, 25 de marzo de 2014 15:58
Para: Josep Bacardit
CC: fiware-lab-help at lists.fi-ware.eu
Asunto: Re: [Fiware-lab-help] Entity attributes

Dear Josep,

The current version of Orion Context Broker (0.10.1) already stores creation
and modification timestamps for entities and attributes in its internal
database (see
https://forge.fi-ware.org/plugins/mediawiki/wiki/fiware/index.php/Publish/Su
bscribe_Broker_-_Orion_Context_Broker_-_Installation_and_Administration_Guid
e#entities_collection).

However, this information (which main purpose is to be used in some DB
management scripts, e.g. the /usr/share/contextBroker/lastest-updates.py
script that comes with the RPM) is not currently exposed in the NGSI API. We
are considering to include it as metadata (NGSI allows to attach metadata to
attributes) in a future version.

What do you think? Are you interested in such functionality? It is important
for us to know your opinion, as we take into account the feedback from our
users to define the future roadmap of our components.

Thanks!

Best regards,

------
Fermín

El 24/03/2014 19:05, Josep Bacardit escribió:

Dear all,

I’m trying to add a timestamp in millisecond in a entity attributes.

{"contextElements": [{"type": "analyzer","isPattern": "false","id":
"object","attributes": [{"TimeInstant": "1395679357129","name":
"activeEnergy","type": "kwh","value": "45"}]}],"updateAction": "APPEND"}

Is it possible to create this type of entities in the orion-psb-image-R3.2?
Or you can only create entities with the attributes: name, type, value?

Thanks and best regards!

Josep Bacardit Alavedra
TÉCNICO - TECHNICAL ESPECIALIST ICT

IDP sin
texto

Edificio Torre Milenium
Av. Francesc Macià, 60, 3a planta
08208 Sabadell (Barcelona)
Tel. 902 431 289
Fax 937 264 579
<mailto:jvanbreest at idp.es> jbacardit @idp.es
www.idp.es <http://www.idp.es/>

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