Questions about ESB tx_payload.noack

RE: Questions about ESB tx_payload.noack

Sigurd — Wed, 19 Apr 2023 11:37:15 GMT

Hi,

I see Kenneth answered in ESB lose packet, retransmit_count not work

RE: Questions about ESB tx_payload.noack

Lurn_Z — Fri, 14 Apr 2023 09:32:10 GMT

Hi Sigurd,

Another question

if (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS)

If the above conditions do not hold, what happens next? Will it retransmit automatically, or drop the packet?

Best regards,

Lurn

RE: Questions about ESB tx_payload.noack

Lurn_Z — Thu, 13 Apr 2023 07:55:38 GMT

Hi,

Through your reply, I can understand like below.

When I set the .selective_auto_ack = false, .noack will not take effect and it should retransmit up to three times until I receive it.

If I set the .selective_auto_ack = true, and .noack = true, it should retransmit up to the MAX retrans times?

If I set the .selective_auto_ack = true, and .noack = false, it will be the same as .selective_auto_ack = false.

Am I right?

Best regards,

Lurn

RE: Questions about ESB tx_payload.noack

Sigurd — Wed, 12 Apr 2023 13:08:36 GMT

Hi,

[quote userid="123170" url="~/f/nordic-q-a/98336/questions-about-esb-tx_payload-noack"]1. In my program, the .selective_auto_ack = false, will .noack work? if .noack is not in effect, how many times will I send data? (e.g. the .retransmit_count = 3)[/quote]

The selective_auto_ack feature allows you to use the "no ack" feature, so that you can disable ACK's on some packets. Without this feature enabled you will receive ACK on all packets.

[quote user=""]

2. How should I set to make .retransmit_count effective? And how should I set about the .noack?

What I want is that when I receive the data it doesn't need to retransmit more times. But if I don't receive data, it should retransmit up to three times until I receive it.When the number of retransmissions reaches three times, it will not retransmit.

[/quote]

Sounds like it's set correctly then. By default it is set to 3, which means you have 3 attempts at retransmitting the payload in case of packet loss.

RE: Questions about ESB tx_payload.noack

Lurn_Z — Mon, 10 Apr 2023 02:47:38 GMT

Is there anyone who can give me some advice?

I have verified the third question, .selective_auto_ack = false, neither .noack=true/false will affect PRX send packet to PTX.

RE: Questions about ESB tx_payload.noack

Lurn_Z — Tue, 04 Apr 2023 03:29:43 GMT

Do you have a good explanation for the above question?