What does a blank payload ack means?

[JulianDM95]

Hi, im working with the Arduino Example called pingpair ack. Sometimes I get this "Blank payload".
¿What does it means? The message was correctly recieved? 

Sometimes I get the ack payload shifted from the message payload and sometimes dont. Why does this happens?

Thanks

[Håkon Alseth]

Hi,

 

My guess is that this is printed when you send, and only get "TX_DS" interrupt back, ie: a blank reply from the receiver (no user data in the ACK). In other scenarios, you get a ACK payload, which sets both TX_DS and RX_DR interrupts.

However; I do not know what example you're running, so I cannot say for sure. 

 

Kind regards,

Håkon

[JulianDM95]

The example is called "Pingpair_ack" you can find it here https://github.com/nRF24/RF24/blob/master/examples/pingpair_ack/pingpair_ack.ino

My final question is: If the ack payload is blank, does it means that the messages was successfully recieved also?

[Håkon Alseth]

JulianDM95 said:

If the ack payload is blank, does it means that the messages was successfully recieved also?

Yes, if an ACK is successfully received, it means that the former payload was sent successfully.