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otCoapTxParameters

#include <coap.h>

This structure represents the CoAP transmission parameters.

Summary

Note:mAckTimeout * ((2 ** (mMaxRetransmit + 1)) - 1) * (mAckRandomFactorNumerator / mAckRandomFactorDenominator) must not exceed what can be represented by a uint32_t (0xffffffff). This limitation allows OpenThread to avoid 64-bit arithmetic.

Public attributes

mAckRandomFactorDenominator
uint8_t
Denominator of ACK_RANDOM_FACTOR used to calculate maximum spacing before first retransmission when ACK is not received (RFC7252 default value of ACK_RANDOM_FACTOR is 1.5; must not be decreased below 1).
mAckRandomFactorNumerator
uint8_t
Numerator of ACK_RANDOM_FACTOR used to calculate maximum spacing before first retransmission when ACK is not received (RFC7252 default value of ACK_RANDOM_FACTOR is 1.5; must not be decreased below 1).
mAckTimeout
uint32_t
Minimum spacing before first retransmission when ACK is not received, in milliseconds (RFC7252 default value is 2000ms).
mMaxRetransmit
uint8_t
Maximum number of retransmissions for CoAP Confirmable messages (RFC7252 default value is 4).

Public attributes

mAckRandomFactorDenominator

uint8_t otCoapTxParameters::mAckRandomFactorDenominator

Denominator of ACK_RANDOM_FACTOR used to calculate maximum spacing before first retransmission when ACK is not received (RFC7252 default value of ACK_RANDOM_FACTOR is 1.5; must not be decreased below 1).

mAckRandomFactorNumerator

uint8_t otCoapTxParameters::mAckRandomFactorNumerator

Numerator of ACK_RANDOM_FACTOR used to calculate maximum spacing before first retransmission when ACK is not received (RFC7252 default value of ACK_RANDOM_FACTOR is 1.5; must not be decreased below 1).

mAckTimeout

uint32_t otCoapTxParameters::mAckTimeout

Minimum spacing before first retransmission when ACK is not received, in milliseconds (RFC7252 default value is 2000ms).

mMaxRetransmit

uint8_t otCoapTxParameters::mMaxRetransmit

Maximum number of retransmissions for CoAP Confirmable messages (RFC7252 default value is 4).