Re: [core] [SenML] Multiple values in a measurement

Ari Keränen <ari.keranen@ericsson.com> Thu, 08 November 2018 08:31 UTC

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From: =?Windows-1252?Q?Ari_Ker=E4nen?= <ari.keranen@ericsson.com>
To: Shantanoo Desai <des@biba.uni-bremen.de>
CC: Michael Koster <michaeljohnkoster@gmail.com>, "fluffy@cisco.com" <fluffy@cisco.com>, "core@ietf.org" <core@ietf.org>
Thread-Topic: [core] [SenML] Multiple values in a measurement
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Subject: Re: [core] [SenML] Multiple values in a measurement
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Also probably worth noting that if you have more thank one set of 
triples in a single SenML Pack, you can link them together using the 
time field.


Cheers,
Ari

On 08/11/2018 0.38, Michael Koster wrote:
> Here is one possibility:
> 
> [
>    {
>      "bn": "inertialmeasurement",
>      "bu": "rad/s",
>      "n": "xvalue",
>      "v": 0.34,
>    },
>    {
>      "n": "yvalue",
>      "v": 1.43,
>    },
>    {
>      "n": "zvalue",
>      "v": 0.23,
>    }
> ]
> 
> Or as an IPSO Smart Object representationfor the accelerometer object 
> type (3313):
> 
> [
>    {
>      "bn": "3313/0/",
>      "n": "5701",
>      "vs": "rad/s",
>    },
>    {
>      "n": "5702",
>      "v": 0.34
>   },
>    {
>      "n": "5703",
>      "v": 0.34
>   },
>    {
>      "n": "5704",
>      "v": 0.34
>   }
> ]
> 
> 
> On Oct 18, 2018, at 1:35 AM, Shantanoo Desai <des@biba.uni-bremen.de 
> <mailto:des@biba.uni-bremen.de>> wrote:
>>
>> Hello all,
>> In a practical scenario there are sensors that provide more than one 
>> values, for e.g., an Inertial Measurement Unit (IMU) will provide 
>> Euler Angles as Yaw, Pitch, Roll indicating orientation of the sensor 
>> node or an Accelerometer which measures linear acceleration in X, Y, Z 
>> directions.
>> Is there any schematic in SenML that would support multiple values?
>> From my understanding there is none and most values are indicated by 
>> the field “v” as a single key:value pair in JSON.
>> <image006.png>
>> Even if I split the reading into three, there might not be clear 
>> distinction since “n” always remains the same (the sensor name is 
>> always “inertialmeasurement”)
>> <image007.png>
>> Is there a way to inculcate such features into senML or is there a way 
>> around this that I have overlooked?
>> Mit freundlichen Grüßen
>>
>> __
>>
>> *i. A. M.Sc. Shantanoo Desai***
>>
>> Wissenschaftlicher Mitarbeiter
>> *BIBA**- Bremer Institut für Produktion und Logistik GmbH*
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