ESB_EVENT_TX_FAILED trigger

[DimaG]

Which problems can cause ESB_EVENT_TX_FAILED event? How does the s/w know that the sending has failed? It is just a sending problem indicator or there is any information coming from the receiver as well?

[Joakim Jakobsen]

Hi. 

I'll check with one of our engineers with more experience with ESB. 

Could you share what version of the SDK you are working with?

Br,
Joakim

[DimaG]

We use version SDK version 1.9.1. 

[Joakim Jakobsen]

It's explained in the link I sent you. 

• If the node is a PTX:

  1. Add packets to the TX FIFO by calling esb_write_payload().

  2. Depending on the value of esb_config.tx_mode that was used in the most recent call to esb_init(), you might have to call esb_start_tx() to start the transmission.

  3. After the radio has received an acknowledgment or timed out, handle ESB_EVENT_TX_SUCCESS, ESB_EVENT_TX_FAILED, and ESB_EVENT_RX_RECEIVED events.

[DimaG]

By acknowledgment , you mean acknowledgment from receiver? Can it be that the acknowledgment was not sent, but the message was received?

[Joakim Jakobsen]

DimaG said:

Can it be that the acknowledgment was not sent, but the message was received?

Yes, that is a possibility,

Br,
Joakim

[DimaG]

Thank you very much. What I do not understand is the following:
We tried to change the parameter "noack" to true and to false. In both cases we sometimes get the "ESB_EVENT_TX_FAILED" message. How can it be? Is it another ack? 

[Joakim Jakobsen]

THE ESB_EVENT_TX_FAILED doesn't HAVE to be because of a timeout waiting for the acknowledgement.

The event is returned if the transmission failed.

Br,
Joakim