- From: Björkengren, Ulf <ulf.bjorkengren@volvocars.com>
- Date: Wed, 15 May 2019 08:36:32 +0000
- To: "Daniel.DW.Wilms@bmw.de" <Daniel.DW.Wilms@bmw.de>, "rstreif@partner.jaguarlandrover.com" <rstreif@partner.jaguarlandrover.com>, "mfeuer1@jaguarlandrover.com" <mfeuer1@jaguarlandrover.com>, "public-automotive@w3.org" <public-automotive@w3.org>
- Message-ID: <HE1P174MB0043F77EEB2B4B5286897B78E0090@HE1P174MB0043.EURP174.PROD.OUTLOOK.COM>
Hi, My short PPT explanation was incomplete, sorry for that. Below you can see a randomly selected (by me) node that first is defined as a single value node, and then in the following definition is an uint8 array with five elements. RearviewMirror.DimmingLevel: datatype: uint8 type: actuator unit: percent description: Dimming level of rearview mirror. 0 = undimmed. 100 = fully dimmed RearviewMirror.DimmingLevel: datatype: uint8 elements: 5 type: actuator unit: percent description: Dimming level of rearview mirror. 0 = undimmed. 100 = fully dimmed I agree with Daniel that is technically possible to handle the array case with the new “position” mechanism that is introduced in VSS. However, I am not fully convinced that is solves it in a perfect way. To explain that, I would like to discuss the “value”:<something> key pair that is returned on a get. My view is that for the array node I defined above the response would have the format “value”:[1,2,3,4,5] (1-5 could of course be any uint8 value). Let us now say that the get is done on the tire pressure node that we have earlier used in the Issue thread where we discussed the positioning solution. The tire pressure “array” there is two dimensional ({left,right}, {row1, row2}). If the response has the same format as above, “value”:[1,2,3,4], I think it is a bit unclear if e. g. the pressure value 2 refers to the left/row2 tire or to the right/row1 tire. Even if this array indexing can be clearly defined, it requires that the client does some logical operations to determine it. I believe the response above should have the format “value”: {“path.to.tire.pressure.left.row1”:1, …,“path.to.tire.pressure.right.row2”:4} To make it unambiguous, and easy to interpret by the client. There is also this difference that in the positioning example there is an explicit path to each element of the array, which is not the case in my proposed array definition (and where I see it only add complexity without any value to have that option). So thus I think that we should support both ways of defining arrays. BR Ulf Ulf Björkengren Ph. D. Connectivity Strategist M +4553562142 ulf.bjorkengren@volvocars.com<mailto:ulf.bjorkengren@volvocars.com> VOLVO CAR CORPORATION 94014 Lund R&D Tech Center Frederikskaj 10A Copenhagen, Denmark volvocars.com From: Daniel.DW.Wilms@bmw.de [mailto:Daniel.DW.Wilms@bmw.de] Sent: den 15 maj 2019 09:30 To: rstreif@partner.jaguarlandrover.com; mfeuer1@jaguarlandrover.com; Björkengren, Ulf <ulf.bjorkengren@volvocars.com>; public-automotive@w3.org Subject: Re: Gen2 ideas Hi, > Array data type: Like Magnus, I am not entirely convinced of the "elements" property. > It might be for backwards compatibility but if "value" now in general is expressed as an > array that would not help much. An array is not a data type on its own as it holds multiple > elements of a certain data type. Maybe "value" should be in general treated as an array of > the data type but the server could unpack it automatically if there is only one element in > the array e.g. instead of returning [5], it returns 5. After the discussion we had yesterday, I’d say the extensions [1] could serve exactly this purpose. Best, Daniel 1. https://github.com/GENIVI/vehicle_signal_specification/issues/81<https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FGENIVI%2Fvehicle_signal_specification%2Fissues%2F81&data=02%7C01%7Culf.bjorkengren%40volvocars.com%7C0a9c3038243d49e7816108d6d907162d%7C81fa766ea34948678bf4ab35e250a08f%7C0%7C0%7C636935021794716021&sdata=hdJ5T%2Bbx3mFiXFAawQP%2F8Vd1DhJLPcqD96Q0oUEWyec%3D&reserved=0> --- BMW Group Daniel Wilms Forschung, Neue Technologien, Innovationen E/E Architektur, Technologien (LT-3) Parkring 19 85748 Garching Postanschrift: 80788 München Tel: +49-89-382-60577 Mail: daniel.dw.wilms@bmw.de<mailto:daniel.dw.wilms@bmw.de> Web: http://www.bmwgroup.com/<https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.bmwgroup.com%2F&data=02%7C01%7Culf.bjorkengren%40volvocars.com%7C0a9c3038243d49e7816108d6d907162d%7C81fa766ea34948678bf4ab35e250a08f%7C0%7C0%7C636935021794716021&sdata=tREjCmBb2vFaVyAiRUxGffmitSXVPBY4gJj4%2BPHZhD8%3D&reserved=0> -------------------------------------------------------------------- Bayerische Motoren Werke Aktiengesellschaft Vorstand/Board of Management: Harald Krüger (Vorsitzender/Chairman), Milagros Caiña Carreiro-Andree, Markus Duesmann, Klaus Fröhlich, Pieter Nota, Nicolas Peter, Peter Schwarzenbauer, Oliver Zipse. Vorsitzender des Aufsichtsrats/Chairman of the Supervisory Board: Norbert Reithofer Sitz und Registergericht/Registered in Germany: München HRB 42243 -------------------------------------------------------------------- From: Rudolf Streif <rstreif@partner.jaguarlandrover.com> Date: Tuesday, 14. May 2019 at 22:16 To: Magnus Feuer <mfeuer1@jaguarlandrover.com>, "Björkengren, Ulf" <ulf.bjorkengren@volvocars.com>, public-automotive <public-automotive@w3.org> Subject: Re: Gen2 ideas Resent-From: <public-automotive@w3.org> Resent-Date: Tuesday, 14. May 2019 at 22:15 Hi Ulf, Thanks for thinking about the next step. I like your proposal. In regards to the slides: * WS/http access restriction: I think that's a good idea. I second it. * Access restriction tagging of resources: That is a good idea too. * I would call the property "access" considering that the settings are "none", "write", "readwrite". * I am missing "readonly" for the "access" property. * For attributes which are readonly by default erroneous settings need to be addressed e.g. write or readwrite on an attribute is not allowed. * Not sure why for branches the property would need to be called differently ("restricted-default"). Why wouldn't it just be "restricted" (or "access" according to my proposal)? * To clarify: * The branch setting would only apply if there is no explicit setting for a leaf. * For branches inside of a branch aka a child-branch, the child-branch setting overrides the parent branch unless the child-branch does not specify it. * Access restriction properties could be provided by OEMs in form of overlays. * Probably need to call out the implicit access defaults for the different element types: * Attribute: read-only * Sensor: read-only * Actuator: write-only * Branch: none * RBranch: none * Array data type: Like Magnus, I am not entirely convinced of the "elements" property. It might be for backwards compatibility but if "value" now in general is expressed as an array that would not help much. An array is not a data type on its own as it holds multiple elements of a certain data type. Maybe "value" should be in general treated as an array of the data type but the server could unpack it automatically if there is only one element in the array e.g. instead of returning [5], it returns 5. :rjs ________________________________ From: Magnus Feuer <mfeuer1@jaguarlandrover.com> Sent: Tuesday, May 14, 2019 9:50 AM To: Björkengren, Ulf; public-automotive Subject: Re: Gen2 ideas I like it. Is there a reason for having a specified element count explicitly called out? I can understand a max_elements count to put an upper limit on the array size, but the implementation will surely be able to figure out the number of elements that are currently stored in an array? Regards, /Magnus F. ------------------- System Architect Manager Jaguar Land Rover Email: mfeuer1@jaguarlandrover.com<mailto:mfeuer1@jaguarlandrover.com> Mobile: +1 949 294 7871 [Image removed by sender. https://ci3.googleusercontent.com/proxy/OfaGrHPlawsuQPtTYPlu2XkJRCrzJtHOGv2OSrFHsvJ6km-xYenAYwOsmmC-X18PrWn7LzA6AM--8oIU05Ifg6GD=s0-d-e1-ft#http://www.jaguarlandrover.com/email/jlr.jpg] Jaguar Land Rover North America, LLC 1450 NW 18th Ave, Portland, OR 97209 ------------------- Business Details: Jaguar Land Rover Limited Registered Office: Abbey Road, Whitley, Coventry CV3 4LF Registered in England No: 1672070 This e-mail and any attachments contain confidential information for a specific individual and purpose. The information is private and privileged and intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient, please e-mail us immediately. We apologise for any inconvenience caused but you are hereby notified that any disclosure, copying or distribution or the taking of any action in reliance on the information contained herein is strictly prohibited. This e-mail does not constitute an order for goods or services unless accompanied by an official purchase order. ________________________________ From: Björkengren, Ulf <ulf.bjorkengren@volvocars.com> Sent: Tuesday, May 14, 2019 5:32:38 AM To: public-automotive Subject: Gen2 ideas BR Ulf Ulf Björkengren Ph. D. Connectivity Strategist M +4553562142 ulf.bjorkengren@volvocars.com<mailto:ulf.bjorkengren@volvocars.com> VOLVO CAR CORPORATION 94014 Lund R&D Tech Center Frederikskaj 10A Copenhagen, Denmark volvocars.com<https://eur02.safelinks.protection.outlook.com/?url=volvocars.com&data=02%7C01%7Culf.bjorkengren%40volvocars.com%7C0a9c3038243d49e7816108d6d907162d%7C81fa766ea34948678bf4ab35e250a08f%7C0%7C0%7C636935021794726030&sdata=8K4BsI2vfjwt05Bp2hnDasMDDAouNAy3m0uireYhk1U%3D&reserved=0>
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Received on Wednesday, 15 May 2019 08:36:59 UTC