Requirements

Boards

The same firmware runs on both supported boards:

Board	USB device plugs into	Power
Waveshare ESP32-P4-ETH	the 4-pin USB OTG HS header (not the Type-C port, which is for power and flashing)	USB-C
M5Stack Unit PoE-P4 (U213)	the Type-C port labelled Host	PoE (802.3at)

The M5Stack Unit PoE-P4X uses newer (rev 3.x) silicon and is not supported.

Each board takes one USB device. USB hubs are not supported.

USB devices

Audio roles: any USB Audio Class 1.0 adapter with a 48 kHz mode. Tested:

• CUBILUX LC6 line in (0bda:4ce8)
• TTGK USB-C Audio line out (3302:17c2, 16-bit stereo)

Serial server: one USB serial adapter. See supported adapters.

USB/IP server: most USB devices. See what works over USB/IP.

Network

• 100 Mbit/s Ethernet. All boards on one VLAN: PTP and mDNS don't cross routers.
• For audio: a switch with IGMP snooping and a querier, and Energy Efficient Ethernet turned off on the audio ports. See network.
• DHCP, or a static IP set on each board.

To build and flash

• A Linux PC with ESP-IDF v6.0.2.
• A USB cable for the first flash. Later updates go over the network.