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Merge pull request #13338 from chrysn-pull-requests/coap-no-deduplication

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nanocoap: State handler idempotentcy requirement
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benpicco 2020-02-13 17:36:28 +01:00 committed by GitHub
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sys/include/net/nanocoap.h
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@ -194,6 +194,17 @@ typedef struct {
/** /**
* @brief Resource handler type * @brief Resource handler type
*
* Functions that implement this must be prepared to be called multiple times
* for the same request, as the server implementations do not perform message
* deduplication. That optimization is [described in the CoAP
* specification](https://tools.ietf.org/html/rfc7252#section-4.5).
*
* This should be trivial for requests of the GET, PUT, DELETE, FETCH and
* iPATCH methods, as they are defined as idempotent methods in CoAP.
*
* For POST, PATCH and other non-idempotent methods, this is an additional
* requirement introduced by the contract of this type.
*/ */
typedef ssize_t (*coap_handler_t)(coap_pkt_t *pkt, uint8_t *buf, size_t len, void *context); typedef ssize_t (*coap_handler_t)(coap_pkt_t *pkt, uint8_t *buf, size_t len, void *context);