Can esb set a special ack payload ?

[nk]

I am using esb dpl in nrf5 sdk v11. I want to put a special packet in ack payload. but I think nrf_esb.c code can not do. the reason is that when on_radio_disabled_rx() is called, tx(ack operation) already start because RADIO_SHORTS_READY_START and RADIO_SHORTS_DISABLED_TXEN are set. so the setting of m_tx_payload_buffer is not in time. is my understanding correct ?

[ovrebekk]

Hi

You have to prepare the ACK payload before the TX packet arrives, otherwise you won't be able to send it in time.

If the ACK payload depends on incoming data from the PTX you can send two packets from the PTX. One with the data, and a second one to pick up the ACK payload.

Best regards, Torbjørn

[nk]

You have to prepare the ACK payload before the TX packet arrives, otherwise you won't be able to send it in time.

I am understanding your saying. I am already calling nrf_esb_write_payload() at PRX before sending at PTX. but I can not get the special packet(ack payload) at PTX. I get a same packet when I sent at PTX.

[ovrebekk]

Can you share the code you use to configure the library and send the ACK? It is most convenient if you just attach the source files.

[nk]

I found the cause. my original debug print had been output in nrf_esb.c. esb is running after debug printf off.

[ovrebekk]

It's good to hear you figured it out :)