Re: [core] message correlation on CoAP
"R.Vinob chander" <vinobchanderr@ssn.edu.in> Fri, 08 January 2016 15:37 UTC
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Date: Fri, 08 Jan 2016 21:06:57 +0530
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From: "R.Vinob chander" <vinobchanderr@ssn.edu.in>
To: robert.cragie@gridmerge.com
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Subject: Re: [core] message correlation on CoAP
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thank u... u r right.....but the a receiver may get multiple copies of the same message if the ACK is lost in transit..(sec. 4.5). So in such cases the same message ID is used within the EXCHANGE_LIFETIME. Hence i think probably the sentence should be "The same Message ID MUST NOT be reused (in communicating with the same endpoint) within the first timeout for CON and MAX_LATENCY for NON" 4.4. Message Correlation The same Message ID MUST NOT be reused (in communicating with the same endpoint) within the EXCHANGE_LIFETIME 4.5. Message Deduplication A recipient might receive the same Confirmable message (as indicated by the Message ID and source endpoint) multiple times within the EXCHANGE_LIFETIME 4.8.2. NON_LIFETIME is the time from sending a Non-confirmable message to the time its Message ID can be safely reused. *If multiple transmission of a NON message is not used, its value is MAX_LATENCY, or 100 seconds*. However, *a CoAP sender might send a NON message multiple times*, in particular for multicast applications. While the period of reuse is not bounded by the specification, an expectation of reliable detection of duplication at the receiver is on the timescales of MAX_TRANSMIT_SPAN. Therefore, for this purpose, it is safer to use the value: MAX_TRANSMIT_SPAN + MAX_LATENCY please clarify.. On Fri, Jan 8, 2016 at 3:45 PM, Robert Cragie <robert.cragie@gridmerge.com> wrote: > I think it is correct as written - the same ID must not be used within > EXCHANGE_LIFETIME. You can add NON_LIFETIME as well. The message ID > certainly can be reused beyond those lifetimes as the occurrence of the > message ID for acknowledgement or duplication detection is no longer > expected. > > Robert > > On 8 January 2016 at 03:58, R.Vinob chander <vinobchanderr@ssn.edu.in> > wrote: > >> Hi All, >> >> sec. 4.4 of RFC 7252 specifies >> >> The same Message ID MUST NOT be reused (in communicating with the >> same endpoint) within the EXCHANGE_LIFETIME >> >> I think the sentence is incorrect and should b, >> >> The same Message ID MUST NOT be reused (in communicating with the >> same endpoint) *beyond* the EXCHANGE_LIFETIME/NON_LIFETIME >> >> Regards, >> -- >> R. Vinob chander, B.E., M.E., (Ph.D) >> Assistant Professor, Department of IT >> SSN College of Engineering, >> Old Mahabalipuram Road >> Kalavakkam - 603 110 >> Tamil Nadu, India >> www.ssn.edu.in >> >> Phone: +9144-27469700 , +91 44 27474844/45/46 >> Extn: 370 >> Mob: +91-9566101580 >> >> ::DISCLAIMER:: >> >> --------------------------------------------------------------------- >> The contents of this e-mail and any attachment(s) are confidential and >> intended for the named recipient(s) only. Views or opinions, if any, >> presented in this email are solely those of the author and may not >> necessarily reflect the views or opinions of SSN Institutions (SSN) or its >> affiliates. Any form of reproduction, dissemination, copying, disclosure, >> modification, distribution and / or publication of this message without the >> prior written consent of authorized representative of SSN is strictly >> prohibited. If you have received this email in error please delete it and >> notify the sender immediately. >> --------------------------------------------------------------------- >> Header of this mail should have a valid DKIM signature for the domain ssn.edu.in <http://www.ssn.edu.in/> >> >> >> _______________________________________________ >> core mailing list >> core@ietf.org >> https://www.ietf.org/mailman/listinfo/core >> >> > -- R. Vinob chander, B.E., M.E., (Ph.D) Assistant Professor, Department of IT SSN College of Engineering, Old Mahabalipuram Road Kalavakkam - 603 110 Tamil Nadu, India www.ssn.edu.in Phone: +9144-27469700 , +91 44 27474844/45/46 Extn: 370 Mob: +91-9566101580 -- ::DISCLAIMER:: --------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of SSN Institutions (SSN) or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of SSN is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. --------------------------------------------------------------------- Header of this mail should have a valid DKIM signature for the domain ssn.edu.in <http://www.ssn.edu.in/>
- [core] message correlation on CoAP R.Vinob chander
- Re: [core] message correlation on CoAP Robert Cragie
- Re: [core] message correlation on CoAP R.Vinob chander
- Re: [core] message correlation on CoAP Robert Cragie