CoAP option for no server-response
draft-tcs-coap-no-response-option-15

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CoRE                                                   A. Bhattacharyya
Internet Draft                                         S. Bandyopadhyay
Intended status: Informational                                   A. Pal
Expires: October 2016                                           T. Bose
                                         Tata Consultancy Services Ltd.
                                                          April 4, 2016

                    CoAP option for no server-response
                   draft-tcs-coap-no-response-option-15

   Abstract

   There can be M2M scenarios where responses from a server against
   requests from client are redundant. This kind of open-loop exchange
   (with no response path from the server to the client) may be desired
   to minimize resource consumption in constrained systems while
   updating a bulk of resources simultaneously, or updating a resource
   with a very high frequency. CoAP already provides Non-confirmable
   (NON) messages that are not acknowledged by the recipient. However,
   the request/response semantics still require the server to respond
   with a status code indicating "the result of the attempt to
   understand and satisfy the request".

   This specification introduces a CoAP option called 'No-Response'.
   Using this option the client can explicitly tell the server to
   suppress all responses against the particular request. This option
   also provides granular control to enable suppression of a particular
   class of response or a combination of response-classes. This option
   may be effective for both unicast and multicast requests. This
   document also discusses a few exemplary applications which benefit
   from this option.

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Table of Contents

   1. Introduction...................................................3
      1.1. Potential Benefits........................................3
      1.2. Terminology...............................................4
   2. Option Definition..............................................4
      2.1. Granular Control over Response Suppression................5
      2.2. Method-specific Applicability Consideration...............7
   3. Miscellaneous Aspects..........................................8
      3.1. Re-using Tokens...........................................9
      3.2. Taking Care of Congestion................................10
      3.3. Handling No-Response Option for a HTTP-to-CoAP Reverse Proxy
      ..............................................................10
   4. Exemplary Application Scenarios...............................11
      4.1. Frequent Update of Geo-location from Vehicles to Backend
      Server........................................................11
         4.1.1. Using No-Response with PUT..........................12
         4.1.2. Using No-Response with POST.........................13
            4.1.2.1. POST updating a fixed target resource..........13
            4.1.2.2. POST updating through query-string.............14

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