Hi John/Ashok/Jon The more fundamental reason for the static port binding is to preserve the same server configuration (UUID, IP, Port) as much as possible in case of re-boot.
If we can get the similar result without static port assignment, it could be acceptable. I think, IoTivity initiate from specific standard port number by default will also satisfy my initial requirement. ,because we can expect there is single IoTivity instance from OIIC server perspective from most of device. We can think about the other possible design as like upper proposal rather than ?It appears that a desire to support static binding did come up after all.?. BR, Uze Choi From: Light, John J [mailto:[email protected]] Sent: Thursday, January 28, 2016 1:58 AM To: ashok.channa at samsung.com; Uze Choi; 'Jon A. Cruz'; jaekeun lee; Macieira, Thiago; iotivity-dev at lists.iotivity.org; Markus Jung Subject: RE: Re: [dev] Need API to set static "sid" and "port number". Ashok, Please explain how requesting an IANA number ?increase[s] the user experience?. It may change the experience of an application developer slightly. John From: ASHOKBABU CHANNA [mailto:[email protected]] Sent: Tuesday, January 26, 2016 9:15 PM To: Light, John J; Uze Choi; 'Jon A. Cruz'; jaekeun lee; Macieira, Thiago; iotivity-dev at lists.iotivity.org; Markus Jung Subject: Re: Re: [dev] Need API to set static "sid" and "port number". Hi, To minimize the changes and also to increase the user experience, can we reserve a port with IANA for IoTivity? <https://www.iana.org/form/ports- services> https://www.iana.org/form/ports-services. (Not sure who can apply for this) This solves multiple problems 1) Minimize the changes in Base layer. 2) Application does not require to store and retrieve the previously configured ports. 3) If it fails to bind, anyway it has to retry other ports. Previously we fixed 5298/6298 ports temporarily but as they are reserved, we moved to system assigned ports. As IoTivity supports multiple transports (BLE/BT), new API for only IP network will be strange for some developers. Regards, Ashok ------- Original Message ------- Sender : Light, John J<john.j.light at intel.com> Date : Jan 26, 2016 23:10 (GMT+05:30) Title : Re: [dev] Need API to set static "sid" and "port number". Uze Choi and Jon, I want to get on the table that implementing your proposal may be difficult and must be done carefully. The structure of IoTivity doesn?t make the change easy, and there are some possible pitfalls. First is that there are two ways to start IoTivity: OCInit() and OCInit1(). OCInit() is the original init, and it has the port argument you want. When I added IPv6, I needed additional arguments, so I added OCInit1(), with the needed arguments to allow configuring IPv6. Since this was an addition to the API, I asked for help from the maintainers, but received none, so it is my invention as it stands. Since I could see that some arguments of OCInit() were not used, I didn?t include them in OCInit1(). Among the removed arguments is the port number. If we upgrade OCInit() to use the port number, we need to also provide a way to do OCInit1() functionality with a port number so you can do the same thing with IPv6. Perhaps OCInit2()? The second issue is the startup path has some difficulties that will need to be worked out. New error codes will need to be added to address this issue, and the IP adapter will need to recognize the condition. The larger problem is that the semantics of starting up are not compatible now. Specifically, right now if any adapter starts up, errors in other adapters (including the one you want) are ignored. This existing behavior will have to be reconsidered. Finally, even if there is only one adapter (IP), OCSelectNetwork in ocstack.c doesn?t propagate error codes, returning only CA_STATUS_FAILED and CA_STATUS_OK. I still think this is a bad idea, but I wanted to provide information for a change if it is going to be done. John Light Intel OTC OIC development From: ???(Uze Choi) [mailto:[email protected]] Sent: Monday, January 25, 2016 9:49 PM To: Light, John J; 'Jon A. Cruz'; jjack.lee at samsung.com; Macieira, Thiago; iotivity-dev at lists.iotivity.org; markus.jung at samsung.com Subject: RE: [dev] Need API to set static "sid" and "port number". Hi Jon/John, I agree ?We know that the ?try? can be unsuccessful, so a discovery fallback is inevitable.? So that we need implement rediscovery UI for fallback case. However, if try is successful, we can reduce the step to re-discover which will bring the big benefit to user from UI perspective. How about including this issue into the Jira ticket for in this coming 1.1.0 release? Markus, could you help it? BR, Uze Choi From: [email protected] [mailto:iotivity-dev- bounces at lists.iotivity.org] On Behalf Of Light, John J Sent: Tuesday, January 26, 2016 6:38 AM To: Jon A. Cruz; jjack.lee at samsung.com; Macieira, Thiago; iotivity- dev at lists.iotivity.org Subject: Re: [dev] Need API to set static "sid" and "port number". Jon, I don?t see any attempt to propose static port binding, so the request doesn?t violate any OIC intent. In any case, since a node might support multiple servers, static port binding wouldn?t work. I understand the request is to make a server ?try? to use a port that it used in a previous run. We know that the ?try? can be unsuccessful, so a discovery fallback is inevitable. John Light From: Jon A. Cruz [mailto:[email protected]] Sent: Monday, January 25, 2016 1:30 PM To: Light, John J; jjack.lee at samsung.com; Macieira, Thiago; iotivity- dev at lists.iotivity.org Subject: Re: [dev] Need API to set static "sid" and "port number". One aspect here sounds like code is depending on IoTivity devices to operate like some other common servers where HTTP is on port 80, telnet is on port 23, ssh on port 22, SMTP is on port 25, etc. Compliance with company IT policies, firewall requirements, vpn rules, etc. might come into play there. If this is so, then a question would be to ask if such port-bound services were counter to the OIC intent, within the OIC intent or un-addressed by it. On the other hand, if it is just code counting on finding a device by using address+port as a key, then I would share concerns on such software being fragile. On 01/22/2016 08:20 AM, Light, John J wrote: Jack Lee (?), In OCDoResource, you can supply a port number in the OCDevAddr argument. Network layer will use it, just as in original IoTivity. So the same functionality exists. I still have reservations about the design of counting on port numbers persisting. John From: [email protected] [mailto:iotivity-dev- bounces at lists.iotivity.org] On Behalf Of ??? Sent: Thursday, January 21, 2016 9:47 PM To: Macieira, Thiago; iotivity-dev at lists.iotivity.org Subject: Re: [dev] Need API to set static "sid" and "port number". - OCDoResource() must set port number. How can forget it? If you right, then iotivity should be redesign. Because, OCDoResource() has port number dependency. If we support just one optional api, we can reduce re-discovery problem. I don't understand why did yoy object to add "OPTIONAL" api although it can provide very useful user exprience. And, old version iotivity could set port number... there is no issue about development ------- Original Message ------- Sender : Thiago Macieira<thiago.macieira at intel.com> Date : 2016-01-22 14:19 (GMT+09:00) Title : Re: [dev] Need API to set static "sid" and "port number". On Friday 22 January 2016 02:25:47 jaekeun lee wrote: > I didn't say that change the mechanism. > I said, support the additional API for set to port number and sid or > di(variable name is sid) is very useful and helpful. > The experience depends on how the application is written > How can fix this issue? > - Presence Check -> Re-Discovery -> Check saved DI & discovered DI -> change > target's IP/PORT or > - re configure every run > These are very inconvenience . > > But, if server can set port, then re-configure only when server not work(may > be ip changed or port occupied). > Just additional API. Forget the port number. If your other side is trying to depend on the port number, please redesign it. You cannot count on the port number being free, so your other side must be able to deal with the port number changing. For that matter, the IP might change after a reboot. Or even without a reboot: IPv6 temporary addresses change about once a day. Since you can't count on the IP being fixed, port numbers don't identify anything. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center <http://ext.samsung.net/mailcheck/SeenTimeChecker?do=28bccb0e7a1e0d063f43730 47812202bf86cbca82d54dcb7a1889aa8efbbee47738ed17e7639ce1f641b1a8c451b0736562 39170f5eb4b5c326bbdfb2ea96a2fcf878f9a26ce15a0> -------------- next part -------------- HTML ?????? ??????????????... URL: <http://lists.iotivity.org/pipermail/iotivity-dev/attachments/20160128/56730617/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.gif Type: image/gif Size: 13168 bytes Desc: ?????? ?? ????????. URL: <http://lists.iotivity.org/pipermail/iotivity-dev/attachments/20160128/56730617/attachment.gif>
