chore(led-driver): add http_poll client and UDP/mDNS test helpers

Made-with: Cursor

tests/udp_client.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+"""UDP discovery test — runs on MicroPython (ESP32).
+
+Brings up Wi-Fi from settings (test harness only), then **`hello.discover_controller_udp(device_name, wdt)`**.
+`hello` does not use Settings or connect Wi‑Fi.
+
+In firmware, **`main.py`** discovers the controller IP in RAM for HTTP; it is not written to settings.
+
+Deploy `src` (including `hello.py`), then from host with cwd `led-driver`:
+
+  mpremote connect PORT run tests/udp_client.py
+"""
+
+import time
+
+import network
+import utime
+from machine import WDT
+
+from hello import discover_controller_udp
+from settings import Settings
+
+CONNECT_WAIT_S = 45
+WDT_MS = 10000
+
+
+def _wait_wifi(sta, timeout_s, wdt):
+    deadline = utime.ticks_add(utime.ticks_ms(), int(timeout_s * 1000))
+    while not sta.isconnected():
+        wdt.feed()
+        if utime.ticks_diff(deadline, utime.ticks_ms()) <= 0:
+            return False
+        print("WiFi status:", sta.status())
+        wdt.feed()
+        time.sleep(1)
+    wdt.feed()
+    return True
+
+
+def main():
+    settings = Settings()
+    ssid = settings.get("ssid") or ""
+    password = settings.get("password") or ""
+
+    if not ssid:
+        print("udp_client: set ssid/password in settings.json (test harness Wi-Fi).")
+        raise SystemExit(1)
+
+    sta = network.WLAN(network.STA_IF)
+    sta.active(True)
+    try:
+        sta.config(pm=network.WLAN.PM_NONE)
+    except (AttributeError, ValueError, TypeError):
+        pass
+
+    wdt = WDT(timeout=WDT_MS)
+    wdt.feed()
+    print("udp_client: connecting to", repr(ssid))
+    sta.connect(ssid, password)
+    wdt.feed()
+    if not _wait_wifi(sta, CONNECT_WAIT_S, wdt):
+        print("WiFi timeout, status=", sta.status())
+        raise SystemExit(1)
+
+    ip = discover_controller_udp(settings.get("name", ""), wdt=wdt)
+    if not ip:
+        raise SystemExit(1)
+
+
+if __name__ == "__main__":
+    main()