Hi, Nash Thank you for detailed explanation,
It seems that only difference between "di" and "piid" is its lifecycle, It it correct? BR, - Kevin On Fri, Mar 16, 2018 at 7:14 AM, Nash, George <george.n...@intel.com> wrote: > This is my attempt to describe the difference between piid and pi. (UUID is > defined by RFC-4122) > > piid (Protocol Independent ID) - is intended as an identifier that is > independent of the piid is required to be a UUID. It is intended to detect > if multiple instances of the same device has been discovered. One use case > you have device `A` discovered by two different bridges. So your client it > told by two different bridges that each bridge has a device. The client can > look at the `piid` for the device from each bridge and it can conclude that > both are the same device because they have the same `piid` even though the > client is getting reports of the device twice over two different connections. > The `piid` could be used to tell if you have discovered the same device over > different protocols. For example TCP and Bluetooth. > > pi (Platfrom ID) is used to identify the platform the device is running on. > Say you have a car with a resources that control the radio and resources that > control the AC. The radio and the AC may each have their own device id but > they could share the platform ID because the car is considered the platform. > Platform id is required to be a UUID > > di (device id) this id is required to be a uuid as well. It is responsible > for identifying the device. The security doxm.deviceuuid and di should be the > same. In the example above the radio and AC may have different device ids. > This depends a little on if the manufacture considers the radio and ac as > different devices or the same device. There are no guidelines that I know of > that lay out the difference between devices and platform. > > Depending on your requirement you can use any of the 3 ids to identify your > device. Before ownership transfer process is completed the security code in > iotivity may server you with a dummy piid, pi, or di value to protect privacy > since these values can be used for tracking a device. (see section 13.12 of > the OCF Security Specification v1.3.0) > > I may be wrong but I don't think there is anything in the spec preventing > using the same UUID for all three values. Using the same UUID could cause you > problems later in the project life so probably best to use a different UUID > for each value. > > I am trying to help but there may be others that understand the difference > better than me. > > George Nash > > -----Original Message----- > From: iotivity-dev-boun...@lists.iotivity.org > [mailto:iotivity-dev-boun...@lists.iotivity.org] On Behalf Of Joo-Chul Kevin > Lee > Sent: Thursday, March 15, 2018 1:54 AM > To: iotivity-dev@lists.iotivity.org > Subject: [dev] difference between "Platform ID" and "PIID" ? > > Hello > > I am always confused about difference between role of "platform ID" > and role of "PIID". > Can anybody explain difference between purpose of "platform ID" and "PIID" > clearly? > > More precisely, Can I use "platform ID" instead of "piid" ? > > Thanks > > - Kevin > > -- > -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > Joo-Chul Kevin Lee, ETRI > 161 Gajeong-dong, Yuseong-gu, daejon, 305-700, KOREA > E-mail: r...@etri.re.kr/cms.r...@gmail.com Tel: +82-42-860-1021 > -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > _______________________________________________ > iotivity-dev mailing list > iotivity-dev@lists.iotivity.org > https://lists.iotivity.org/mailman/listinfo/iotivity-dev -- -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Joo-Chul Kevin Lee, ETRI 161 Gajeong-dong, Yuseong-gu, daejon, 305-700, KOREA E-mail: r...@etri.re.kr/cms.r...@gmail.com Tel: +82-42-860-1021 -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ _______________________________________________ iotivity-dev mailing list iotivity-dev@lists.iotivity.org https://lists.iotivity.org/mailman/listinfo/iotivity-dev
