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

Álvaro Arranz aarranz at ficodes.com
Fri May 18 17:51:59 CEST 2018


Dear Prashant,

any progress? Did you were able to fix those problems?

Please, do not hesitate to contact us if you continue having problems.

Best Regards,
Álvaro
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*Álvaro Arranz García*

Chief Executive Officer <http://ficodes.com/>

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El mié., 16 de may. de 2018 a la(s) 11:40, Álvaro Arranz (
aarranz at ficodes.com) escribió:

> Hi again,
>
> Regarding this:
>
> 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.
>
>
>
> This probably has something to do with some problematic characters inside
> data values. Are you using new line characteres (e.g. «\n») inside data
> values?, In that case, you should escape them, because the orion context
> broker has a bug and does not encode them correctly, returning an invalid
> JSON response. See this ticket
> <https://github.com/telefonicaid/fiware-orion/issues/2938> for more
> details.
>
> Best regards,
> Álvaro
> [image: FICODES]FUTURE INTERNET CONSULTING & DEVELOPMENT SOLUTIONS S.L
> <http://www.ficodes.com/>
> *Álvaro Arranz García*
>
> Chief Executive Officer <http://ficodes.com/>
>
> aarranz at ficodes.com
>
> +34 669 079 467
>
> www.ficodes.com
>
>
> El mar., 15 de may. de 2018 a la(s) 13:57, Prashant Chauhan1 (
> PC00474884 at techmahindra.com) escribió:
>
>> 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.
>>
>>
>>
>>
>>
>> <http://www.techmahindra.com/>
>>
>>
>>
>> *Prashant Chauhan*
>>
>>
>>
>> Software Engineer
>>
>>
>>
>> CIESIOT
>>
>> Noida-NSEZ
>>
>>
>>
>> Mobile : +919582019151
>>
>>
>>
>> PC00474884 at techmahindra.com
>>
>>
>>
>>
>>
>> We believe
>>
>>
>>
>>
>>
>>
>>
>> <http://online.wsj.com/ad/inthefuture/>
>>
>>
>>
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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
>>    - 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> 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.
>>
>>
>>
>>
>>
>> <http://www.techmahindra.com/>
>>
>>
>>
>> *Prashant Chauhan*
>>
>>
>>
>> Software Engineer
>>
>>
>>
>> CIESIOT
>>
>> Noida-NSEZ
>>
>>
>>
>> Mobile : +919582019151
>>
>>
>>
>> PC00474884 at techmahindra.com
>>
>>
>>
>>
>>
>> We believe
>>
>>
>>
>>
>>
>>
>>
>> <http://online.wsj.com/ad/inthefuture/>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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