After I add ack to ESB the probability of TX failure becomes higher

RE: After I add ack to ESB the probability of TX failure becomes higher

Einar Thorsrud — Fri, 08 Jul 2022 12:02:30 GMT

Hi,

[quote user="xiami"]Thank you, the probability of failure to send is reduced after I increase retransmit_count.[/quote]

Good to hear, that makes sense.

[quote user="xiami"]I have another question: sometimes I receive data that I send.[/quote]

It is not physically possible for the radio to receive it's own signal (it is either in Tx of Rx, never both modes at once), so if you receive the same data it is sent back by the other party for some reason.

RE: After I add ack to ESB the probability of TX failure becomes higher

xiami — Thu, 07 Jul 2022 14:06:37 GMT

Thank you, the probability of failure to send is reduced after I increase retransmit_count.
I have another question: sometimes I receive data that I send.

RE: After I add ack to ESB the probability of TX failure becomes higher

Einar Thorsrud — Thu, 07 Jul 2022 13:45:11 GMT

If the problem here is that the packet cannot make it through with the configured maximum number of retransmits, you could increase the retransmit_count parameter (in the nrf_esb_config_t instance you pass to nrf_esb_init() or using nrf_esb_set_retransmit_count()).

RE: After I add ack to ESB the probability of TX failure becomes higher

xiami — Thu, 07 Jul 2022 13:36:45 GMT

When I enable ack and retransmission, what should I do to reduce the probability of sending failure?

RE: After I add ack to ESB the probability of TX failure becomes higher

Einar Thorsrud — Thu, 07 Jul 2022 12:53:17 GMT

Hi,

If you enable ACK and retransmissions there will be retransmissions for until an ACK is received back or the retransmit count has been reached. If it is, and there is no ack, you will get a NRF_ESB_EVENT_TX_FAILED event (see how m_retransmits_remaining is used in nrf_esb.c for details). So it is expected that you will more failure events after enabling ACK (after all, you are no longer just ignoring packet loss).