<p>I just tested it and had some issues. I tested with samr21xpro and nrf5284dk all 16 combinations of ack_req, autoack, -ack_req and -autoack sending with both boards (multiple times) and wrote the results into a table.<br>
I expected to receive some kind of a symmetric matrix, since combinations should have the same effect when swapping them between the boards, but this was clearly not the case.</p>
<p>Something that always worked was -ack_req on both boards.</p>
<p>Also I found some interesting bug with ping when sending from samr to nrf with combination <strong>[samr with autoack and -ack_req]</strong> and <strong>[nrf with autoack and ack_req]</strong>:<br>
<code>INFO # 2 packets transmitted, 3 packets received, 3 duplicates, 2147483598% packet loss</code><br>
I've seen this bug before this PR and it occured with different combinations sometimes, but for the first time I could reproduce it everytime with this one combination. Can you confirm my finding, I would raise an issue then.</p>

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