Detecting all devices connected to main ap

Pls, be more specific.

I have applied this rule in main AP but all the devices seems to access the internet regardless.

Try TTL 2. And run tcpdump on D2, to check, whether TTL decremented. Not shure, whether D3/4 decrement TTL, as well.

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It seems there was some issue with my router settings. Now it seems to works just fine.
I was wondering if there is any efficient solution to detect if any one is accessing the internet via hotspot?

On AP, it should be possible to check the TTLs in the passing packets. However, might be quite CPU intensive. Anyway, your questions are not openwrt specific. And indicating some commercial system. Which is not entitled to free consultation.

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That's fine. Thank you for your valuable support. Cheers!