Import ESP_UniClock (upstream 1189810)

Vendored from https://github.com/gpeter62/ESP_UniClock: the sketch
source, the web UI and the libraries the ESP8266 build needs, unpacked
from the bundled zips. Adds a PlatformIO project for the ESP-12. The
source is unchanged; local changes follow as separate commits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

firmware/uniclock/lib/arduino-home-assistant-main/examples/fan/fan.ino

@@ -0,0 +1,53 @@
+#include <Ethernet.h>
+#include <ArduinoHA.h>
+
+#define BROKER_ADDR     IPAddress(192,168,0,17)
+
+byte mac[] = {0x00, 0x10, 0xFA, 0x6E, 0x38, 0x4A};
+
+EthernetClient client;
+HADevice device(mac, sizeof(mac));
+HAMqtt mqtt(client, device);
+
+// HAFan::SpeedsFeature enables support for setting different speeds of fan.
+// You can skip this argument if you don't need speed management.
+// "ventilation" is unique ID of the fan. You should define your own ID.
+HAFan fan("ventilation", HAFan::SpeedsFeature);
+
+void onStateChanged(bool state) {
+    Serial.print("State: ");
+    Serial.println(state);
+}
+
+void onSpeedChanged(uint16_t speed) {
+    Serial.print("Speed: ");
+    Serial.println(speed);
+}
+
+void setup() {
+    Serial.begin(9600);
+
+    // you don't need to verify return status
+    Ethernet.begin(mac);
+
+    // set device's details (optional)
+    device.setName("Arduino");
+    device.setSoftwareVersion("1.0.0");
+
+    // configure fan (optional)
+    fan.setName("Bathroom");
+    fan.setRetain(true);
+    fan.setSpeedRangeMin(1);
+    fan.setSpeedRangeMax(100);
+
+    // handle fan states
+    fan.onStateChanged(onStateChanged);
+    fan.onSpeedChanged(onSpeedChanged);
+
+    mqtt.begin(BROKER_ADDR);
+}
+
+void loop() {
+    Ethernet.maintain();
+    mqtt.loop();
+}