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/cover/cover.ino

@@ -0,0 +1,49 @@
+#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);
+HACover cover("my-cover"); // "my-cover" is unique ID of the cover. You should define your own ID.
+
+void onCoverCommand(HACover::CoverCommand cmd) {
+    if (cmd == HACover::CommandOpen) {
+        Serial.println("Command: Open");
+        cover.setState(HACover::StateOpening);
+    } else if (cmd == HACover::CommandClose) {
+        Serial.println("Command: Close");
+        cover.setState(HACover::StateClosing);
+    } else if (cmd == HACover::CommandStop) {
+        Serial.println("Command: Stop");
+        cover.setState(HACover::StateStopped);
+    }
+
+    // Available states:
+    // HACover::StateClosed
+    // HACover::StateClosing
+    // HACover::StateOpen
+    // HACover::StateOpening
+    // HACover::StateStopped
+
+    // You can also report position using setPosition() method
+}
+
+void setup() {
+    Serial.begin(9600);
+    Ethernet.begin(mac);
+
+    cover.onCommand(onCoverCommand);
+    cover.setName("My cover"); // optional
+    // cover.setRetain(true); // optionally you can set retain flag
+
+    mqtt.begin(BROKER_ADDR);
+}
+
+void loop() {
+    Ethernet.maintain();
+    mqtt.loop();
+}