I have 16 LED strips and 2 ESP32 controllers. I’d like to hardware 8 strips to each ESP32 and use one ESP32 as the “master” and the other as a slave via virtual LEDs. I’d also like to do this without an external router involved. The problem I see is that the virtual LED setup requires an IP address. Do I absolutely need an external router to make this work?
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No, you can use WLED in AP mode and connect slave unit to master’s SSID.
Be warned that performance and/or reliability may suffer.