Need help on NRF24LE1 Auto retransmit & Auto ACK confusions

Question

Hi all,
Since I will use broadcast way in RF transactions between one NRF24LE1 based senders and serveral NRF24LE1 based receivers . I was told not to use "Auto ACK" in broadcast situation. 
 Then I have one question, that if I disable "Auto ACK", then can I keep the "Auto Retransmit" feature enabled? And if I set maximum retransmit counts to be 15, can it actually send 15 times in each calling RF_Send() API? 
 To reduce the data lost, I really need this retransmit feature. Could you please help me about this uncertainty? Thanks in advance!

Hung Bui · Accepted Answer

Hi Junma, 
 I assume that you don't plan to send data from your receivers to the sender.
You can't disable Auto ACK and still have Auto Retransmit. 
 There are 2 options for you: 
 
 
 Disable Auto ACK, and send a packet 15 times manually before switch to the new packet. 
 
 
 Enable Auto ACK and set the number of auto retransmit to 15. Since the receiver only receives, it doesn't mater if you enable Auto ACK or not. But you will consume more power because the transmitter will stay in receiving mode for a while waiting for ACK on each packet.