J
@fernandes-son That would be consistent with what I believe the code does.
The AU915 region only sends join requests at SF12, which take a long time to send, and are thus affected by the specific duty cycle. Some other regions can use faster data rates which mitigates the issue, depending on what data rate is used first.
Is there a specific reason this is an issue for you? Normally a device just joins once and after that it doesn't need to do it again, so it shouldn't be a big issue.
You may try restricting data rates on the channels, but I wouldn't be surprised if the code actually enforced the DR0 rule for joins per the spec.