[Fiware-tech-help] Fetch Data From Orion Context Broker

[Prashant Chauhan1]

Hi Miguel,

Thanks for your support.

I’ve used the same settings for the URL of ngsi-source operator but getting the below error in the logs.
                Error creating subscription in the context broker server: The server returned an invalid json structure.
Also I have used this configuration before, but could not receive any result.
Please help me resolve this over WebEX call, it will just take 15 minutes of your time.
Also, PFA the ngsi-settings.PNG file for your reference.


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Prashant Chauhan



Software Engineer



CIESIOT
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Mobile : +919582019151



PC00474884 at techmahindra.com<mailto:PC00474884 at techmahindra.com>





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From: mjimenez at conwet.com <mjimenez at conwet.com> On Behalf Of Miguel Jimenez
Sent: Tuesday, May 15, 2018 3:34 PM
To: Prashant Chauhan1 <PC00474884 at TechMahindra.com>
Cc: fiware-tech-help at lists.fiware.org; Krishan Babbar <KB00449283 at TechMahindra.com>; Álvaro Arranz <aarranz at ficodes.com>; Yugal Kishor Mullick <YM00106030 at TechMahindra.com>; Francisco de la Vega <fdelavega at ficodes.com>
Subject: Re: [Fiware-tech-help] Fetch Data From Orion Context Broker

Hi Prashant,

That operator does require 2 general configs regarding URLs of the CB:

  *   URL of the Context Broker, that would be the one you indicate http://130.206.117.237:1026<http://130.206.117.237:1026/>
  *   URL of a proxy (so as to receive asynchronous notifications for subscriptions), that you can leave by default on a global instance running at https://ngsiproxy.lab.fiware.org or deploying your own one.
Besides this information, some other configs are required to address specific information. You can indicate an ID pattern or a query, or you can simply indicate the type of the desired entities, plus the FIWARE service (tenant) required for accessing them, and the FIWARE service path where that entities have been uploaded inside the CB. In case you want subscriptions (through the proxy), and not only an initial query, you have to indicate, coma sepparated, the list of attributes whose change would fire a new asinchronous notifications (a new entity with that attributes does also fires this).

And appart from that, you would want to consume the information. Operators Entity 2 PoI (generic, does require a setting to indicate the attribute to search for location information and an icon) or FIWARE data model 2 PoI (based on FIWARE data models, fully automatic handling dozens of different icons) does generate points of interest so as to easily be imported in a map (Open Layers map is simpler since it does not require google api kkey). You can download and analyze their code, in case you want to learn how to handle notification events, but they are simply json objects with the data (full query or individual objects).

Let me get more detailed information on the Table Viewer widget, since I've not used it for long. I'll will come with further details.

Best regards,

───────────────────────────
Miguel Jiménez Gañán, PhD.
  Dpto. Lenguajes y Sistemas Informáticos e Ingeniería de Software
  Escuela Técnica Superior de Ingenieros Informáticos
  Universidad Politécnica de Madrid (UPM)
───────────────────────────

On Mon, May 14, 2018 at 12:18 PM, Prashant Chauhan1 <PC00474884 at techmahindra.com<mailto:PC00474884 at techmahindra.com>> wrote:
Hi,

I’m trying to use the ‘ngsi-source-operator’ to fetch data from ‘Orion context broker’ and trying to populate that data on the Map Widget.
My Orion instance is running @ http://130.206.117.237:1026 and I’m using the global instance of wirecloud.
Please suggest me, what setting should I use for NGSI-source-operator in order to fetch data.
Also while creating subscriptions, which URL should I use to send the notifications.

Another query is regarding Table Viewer widget, as it requires input points as ‘Data and Structures’, is there any available operator to fetch or create a dataset for this table viewer widget.


[cid:image001.png at 01D3EC6B.10053970]<http://www.techmahindra.com/>



Prashant Chauhan



Software Engineer



CIESIOT
Noida-NSEZ



Mobile : +919582019151



PC00474884 at techmahindra.com<mailto:PC00474884 at techmahindra.com>





We believe







[cid:image002.png at 01D3EC6B.10053970]<http://online.wsj.com/ad/inthefuture/>















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