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).

Resources

OpenThread API Reference topics originate from the source code, available on GitHub. For more information, or to contribute to our documentation, refer to Resources.