I found time to build four wESP32 prototypes yesterday!  Here are some shots taken during the (manual) assembly process.

Stencil with board ready to be pasted:

Boards with solder paste, ready for assembly:

Most components placed:

After reflow:

All boards needed some touch up, my solder pasting was kinda messy with the frameless stencil and the old paste, so there was some bridging on the QFNs that needed to be fixed up.

Then after I completed the assembly of the first prototype I plugged in the PoE Ethernet jack and immediately measured 11.4V on the V+ rail!  Yay, what a relief! :)  The PoE section seems to be immediately operational.  I had some trouble programming the ESP32 using the ESP32-Prog submodule though.  Switched to a different prototype I finished up, and on that one I could program the ESP32 right away!  So I loaded the ESP-IDF Ethernet example and plugged it in:

Behold, blinking LEDs on the Ethernet jack and a sure sign of success! Checking the serial monitor, I could tell the device was successfully getting an IP address from DHCP as well. :)

This is what has been verified to work so far on some of these prototypes:

• PoE produces 11.4V on the V+ rail, and 5.1V when the 5V solder bridge is closed.
• Buck converter produces 3.3V to power the ESP32 and Phy.
• Ethernet Phy is operational and communicates with the ESP32, tested to the point of getting an IP address from DHCP.
• ESP32-Prog submodule and on-board logic manages the EN and IO0 signal correctly to allow programming, serial monitoring and 50MHz EMAC clock to work correctly.

I have two prototypes where all the above works, a third seems to work but for unknown reason it is not getting an IP address from DHCP, and on the fourth I can't seem to program the ESP32 yet.  Still work to do to get those going but it seems likely these are just assembly issues and not a problem with the design.  Let's hope.

More testing is still needed to make sure the design is sound:

• Check the power supplies and see how noisy they are, optimize snubbers and filters in the flyback stage to minimize noise and optimize the EMC.
• Check how much power can be pulled from the PoE with and without a heat sink attached.  See if we get to 12.95W which is the target for 802.3af (802.3at Type 1).  I hope to get there with a heat sink, but expect a lower maximum when no heat sink is used.
• Check how much power we can pull when the 5V option is selected.  I'm not expecting to reach 12.95W here, since the flyback is optimized for 12V.
• Check if we have enough power and good enough signal with really long cables (does anyone know if there is a way to get a signal qualify figure from the phy?).
• Check how much power is available from the 3.3V rail for the specification.