Hi there,
So first up was the Xiao Relay or The Xiao C3 Matter Relay with Battery bottom 
It is Now On the Alexa as XIAO C3 Plug 
I used the ESP LaunchPad to Set GPIO 3 as the RELAY and GPIO 2 as the Button (manual On/Off) and the LED (you can use NeoPixel’s) This is a Matter Wifi endpoint.
I Used the QR-code that the ESP LaunchPad Generated…after Flashing the New Fresh, Xiao ESP32C3 successful message to add it to My Alexa took under a Minute.
A FEW moments Later! 
I remixed the the Basic Cover to accommodate the EXT Antenna. then added a Battery Bottom, NeoPixel location (WIP)… I’ll post up the STL’s and Freecad files after.
Works like a BOSS! and looks cool Too!
When Daylight comes I’ll do Some range testing 
HTH
GL 
PJ
