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net/coap: Represent ACK_RANDOM_FACTOR multiplied by 1000

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This commit is contained in:
Leandro Lanzieri 2020-01-27 17:05:22 +01:00
parent 618919bb17
commit 8c25d12ae5
1 changed files with 13 additions and 4 deletions
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17
sys/include/net/coap.h
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@ -178,15 +178,24 @@ extern "C" {
* This value is for the response to the *initial* confirmable message. The
* timeout doubles for subsequent retries. To avoid synchronization of resends
* across hosts, the actual timeout is chosen randomly between
* @ref COAP_ACK_TIMEOUT and (@ref COAP_ACK_TIMEOUT * @ref COAP_RANDOM_FACTOR).
* @ref COAP_ACK_TIMEOUT and
* (@ref COAP_ACK_TIMEOUT * @ref COAP_RANDOM_FACTOR_1000 / 1000).
*/
#ifndef COAP_ACK_TIMEOUT
#define COAP_ACK_TIMEOUT (2U)
#endif
/** @brief Used to calculate upper bound for timeout; see @ref COAP_ACK_TIMEOUT */
#ifndef COAP_RANDOM_FACTOR
#define COAP_RANDOM_FACTOR (1.5)
/**
* @brief Used to calculate upper bound for timeout
*
* This represents the `ACK_RANDOM_FACTOR`
* ([RFC 7252, section 4.2](https://tools.ietf.org/html/rfc7252#section-4.2))
* multiplied by 1000, to avoid floating point arithmetic.
*
* See @ref COAP_ACK_TIMEOUT
*/
#ifndef COAP_RANDOM_FACTOR_1000
#define COAP_RANDOM_FACTOR_1000 (1500)
#endif
/**