Import led-driver app: pico/ and esp32/ layout

Co-authored-by: Cursor <cursoragent@cursor.com>

esp32/src/main.py

@@ -0,0 +1,34 @@
+"""
+XIAO ESP32-C6: ESPNOW -> UART passthrough to Pico.
+Receives messages via ESPNOW, forwards them unchanged to UART (GPIO17).
+UART at 921600 baud. LED on GPIO15 blinks on activity.
+"""
+import network
+import espnow
+import machine
+import time
+
+# UART: TX on GPIO17 -> Pico RX, max baud for throughput
+UART_BAUD = 921600
+uart = machine.UART(1, baudrate=UART_BAUD, tx=17)
+led = machine.Pin(15, machine.Pin.OUT)
+
+# WLAN must be active for ESPNOW (no need to connect)
+sta = network.WLAN(network.WLAN.IF_STA)
+sta.active(True)
+sta.disconnect()
+
+e = espnow.ESPNow()
+e.active(True)
+# No peers needed to receive; add_peer() only for send()
+
+# Recv timeout 0 = non-blocking
+print("ESP32: ESPNOW -> UART passthrough, %d baud" % UART_BAUD)
+while True:
+    mac, msg = e.irecv(0)
+    if msg:
+        uart.write(msg)
+        led.value(1)
+    else:
+        led.value(0)
+    time.sleep_ms(1)