Wireless node discovery in Asuswrt-Merlin doesn't work on most router combinations since the introduction of AiMesh 2.0 with 386 base firmware. I've tried with AC68U and variants, AC5300, AC86U, AX58U, AX86U, AX88U - if you don't have the main and node wired chances are your node won't be recognized at all or will be seen but unable to ... More @Wikipedia
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