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/hvac/hvac.ino

@@ -0,0 +1,102 @@
+#include <ESP8266WiFi.h>
+#include <ArduinoHA.h>
+
+#define BROKER_ADDR     IPAddress(192,168,0,17)
+#define WIFI_SSID       "MyNetwork"
+#define WIFI_PASSWORD   "MyPassword"
+
+WiFiClient client;
+HADevice device;
+HAMqtt mqtt(client, device);
+
+// see src/device-types/HAHVAC.h header for more details
+HAHVAC hvac("my_name", HAHVAC::AuxHeatingFeature | HAHVAC::AwayModeFeature | HAHVAC::HoldFeature);
+
+unsigned long lastTempPublishAt = 0;
+double lastTemp = 0;
+
+void onAuxHeatingStateChanged(bool state) {
+    Serial.print("Aux heating: ");
+    Serial.println(state);
+}
+
+void onAwayStateChanged(bool state) {
+    Serial.print("Away state: ");
+    Serial.println(state);
+}
+
+void onHoldStateChanged(bool state) {
+    Serial.print("Hold state: ");
+    Serial.println(state);
+}
+
+void onTargetTemperatureChanged(double temp) {
+    Serial.print("Target temperature: ");
+    Serial.println(temp);
+}
+
+void onModeChanged(HAHVAC::Mode mode) {
+    Serial.print("Mode: ");
+    if (mode == HAHVAC::OffMode) {
+        Serial.println("off");
+    } else if (mode == HAHVAC::AutoMode) {
+        Serial.println("auto");
+    } else if (mode == HAHVAC::CoolMode) {
+        Serial.println("cool");
+    } else if (mode == HAHVAC::HeatMode) {
+        Serial.println("heat");
+    } else if (mode == HAHVAC::DryMode) {
+        Serial.println("dry");
+    } else if (mode == HAHVAC::FanOnlyMode) {
+        Serial.println("fan only");
+    }
+}
+
+void setup() {
+    Serial.begin(9600);
+    Serial.println("Starting...");
+
+    // Unique ID must be set!
+    byte mac[WL_MAC_ADDR_LENGTH];
+    WiFi.macAddress(mac);
+    device.setUniqueId(mac, sizeof(mac));
+
+    // connect to wifi
+    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+    while (WiFi.status() != WL_CONNECTED) {
+        Serial.print(".");
+        delay(500); // waiting for the connection
+    }
+    Serial.println();
+    Serial.println("Connected to the network");
+
+    // set device's details (optional)
+    device.setName("NodeMCU");
+    device.setSoftwareVersion("1.0.0");
+
+    // assign callbacks (optional)
+    hvac.onAuxHeatingStateChanged(onAuxHeatingStateChanged);
+    hvac.onAwayStateChanged(onAwayStateChanged);
+    hvac.onHoldStateChanged(onHoldStateChanged);
+    hvac.onTargetTemperatureChanged(onTargetTemperatureChanged);
+    hvac.onModeChanged(onModeChanged);
+
+    // configure HVAC (optional)
+    hvac.setName("My HVAC");
+    hvac.setMinTemp(10);
+    hvac.setMaxTemp(30);
+    hvac.setTempStep(0.5);
+    hvac.setRetain(true);
+
+    mqtt.begin(BROKER_ADDR);
+}
+
+void loop() {
+    mqtt.loop();
+
+    if ((millis() - lastTempPublishAt) > 3000) {
+        hvac.setCurrentTemperature(lastTemp);
+        lastTempPublishAt = millis();
+        lastTemp += 0.5;
+    }
+}