[Fiware-ngsi] voting for subscribeContextRequest option

[Tobias Jacobs]

As indicated in the phone conference, I also vote for the flexible approach.

The main reason is that it is much more convenient for the context consuming application that wants to subscribe to context information whose availability is not always guaranteed.
Assume a fleet management application. If one of the managed vehicles in an underground parking lot (without GPS and network access) for a longer period of time and the conservative approach is chosen, the management application would have to repeatedly issue subscription requests in short intervals, as otherwise the app will not be aware of the vehicle leaving the parking lot.

Best
Tobias

From: fiware-ngsi-bounces at lists.fi-ware.eu [mailto:fiware-ngsi-bounces at lists.fi-ware.eu] On Behalf Of Haller, Stephan
Sent: Donnerstag, 22. März 2012 11:28
To: Farkas, Lorant (NSN - HU/Budapest); fiware-ngsi at lists.fi-ware.eu
Subject: Re: [Fiware-ngsi] voting for subscribeContextRequest option

All,

My vote goes to the flexible approach.

I would recommend though that the response body should contain some "warning" if the attribute doesn't exist.
It is then up to the app if it wants to react (change/delete the subscription) or not.

Regards,
-Stephan


From: fiware-ngsi-bounces at lists.fi-ware.eu<mailto:fiware-ngsi-bounces at lists.fi-ware.eu> [mailto:fiware-ngsi-bounces at lists.fi-ware.eu]<mailto:[mailto:fiware-ngsi-bounces at lists.fi-ware.eu]> On Behalf Of Farkas, Lorant (NSN - HU/Budapest)
Sent: Donnerstag, 22. März 2012 10:25
To: fiware-ngsi at lists.fi-ware.eu<mailto:fiware-ngsi at lists.fi-ware.eu>
Subject: [Fiware-ngsi] voting for subscribeContextRequest option


Dear All,

I would like to set up a vote for one of the issues having been discussed in the last NGSI technical meeting. It is about 5.4.2.1 subscribeContextRequest and the question is whether we allow (flexible approach) to subscribe for attributes that still do not exist or not (return an error - conservative approach).

Please take a look at the minutes (pages 6, 7, https://forge.fi-ware.eu/docman/view.php/11/884/NGSI-Minutes-Telco-20032012.docx) for the discussions on the topic, make up your mind and cast your vote per partner by EOB 23.03.2012.

If no consensus is reached, I guess we will need to take a majority approach.

Thanks & Br,

Lorant
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