Examples as Arduino sketches: one folder per device type, each its own endpointId, Wi-Fi with a timeout

Light, DimmableLight, ColorTemperatureLight, ColorLight, TemperatureSensor, ContactSensor, Blind,
Thermostat, Lock, Scene, Doorbell and MultiDevice on the 2.0 API: addCapability(row, instance), one
onDirective() handler, the report helpers, ChangeReports from loop(), a deferred answer for the lock.
Wi-Fi is waited for 30 s, then the sketch says what to check and carries on.

examples/README.md has what each sketch does, its limits and the measured sizes for d1_mini: Light
takes 30,616 bytes of static RAM and 332,565 of flash; all 17 sketches build with 0 warnings.
test/test_examples compares the discovery object of every new sketch: 147 host tests (were 135).
The sketches were compiled, not run on a board.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

examples/ColorTemperatureLight/ColorTemperatureLight.ino

@@ -0,0 +1,156 @@
+// ColorTemperatureLight: a white lamp with a warm and a cold channel (Alexa.PowerController,
+// Alexa.BrightnessController, Alexa.ColorTemperatureController).
+//
+// Two PWM outputs drive the two LED channels; the color temperature decides how the brightness is shared between
+// them. The lamp covers 2200 K to 7000 K: a value outside of it is set to the nearest the lamp has, and the answer
+// reports what was set. "Alexa, make the lamp warmer" and "cooler" move to the next of the five steps below.
+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <Alex2ESP.h>
+
+// Wi-Fi and the credentials of your Alex2MQTT account
+const char *WIFI_SSID = "";
+const char *WIFI_PASSWORD = "";
+
+const char *ALEXA_USERNAME = "";
+const char *ALEXA_PASSWORD = "";
+const char *ALEXA_ROOT_TOPIC = "";
+
+const uint8_t WARM_PIN = 5; // D1 on a Wemos D1 mini, high = lit
+const uint8_t COLD_PIN = 4; // D2
+
+// Warm white, soft white, white, daylight white, cool white: the values Alexa sends for these names
+const int STEPS[] = {2200, 2700, 4000, 5500, 7000};
+const int STEP_COUNT = sizeof(STEPS) / sizeof(STEPS[0]);
+
+Alex2ESP alexa;
+bool lampOn = false;
+int brightness = 100; // percent
+int kelvin = 2700;
+
+// Joins the Wi-Fi network and returns after 30 s at the latest. Without a connection the sketch carries on: the
+// ESP8266 keeps trying, and alexa.loop() opens the MQTT session once Wi-Fi is up.
+void connectWiFi()
+{
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+  Serial.printf("\n[WIFI] Connecting to \"%s\"\n", WIFI_SSID);
+
+  unsigned long started = millis();
+  while (WiFi.status() != WL_CONNECTED && millis() - started < 30000)
+  {
+    delay(100);
+  }
+
+  if (WiFi.status() == WL_CONNECTED)
+  {
+    Serial.printf("[WIFI] Connected, IP address %s\n", WiFi.localIP().toString().c_str());
+  }
+  else
+  {
+    Serial.printf("[WIFI] No connection after 30 s (status %d): check WIFI_SSID and WIFI_PASSWORD. Still trying.\n",
+                  WiFi.status());
+  }
+}
+
+void writeLamp()
+{
+  int level = lampOn ? brightness : 0;
+  int cold = map(kelvin, STEPS[0], STEPS[STEP_COUNT - 1], 0, level);
+  analogWrite(COLD_PIN, cold);
+  analogWrite(WARM_PIN, level - cold);
+}
+
+// The state of the lamp: what the answer to a directive and the answer to ReportState carry
+void sendState(AlexaStatusMessage message)
+{
+  message.addHealthProp(EndpointHealth::OK)
+      .addPowerControllerProp(lampOn ? PowerController::ON : PowerController::OFF)
+      .addBrightnessControllerProp(brightness)
+      .addColorTemperatureControllerProp(kelvin)
+      .send();
+}
+
+void onDirective(AlexaDirective &directive)
+{
+  if (directive.isReportState())
+  {
+    sendState(directive.stateReport());
+    return;
+  }
+
+  if (directive.is("TurnOn") || directive.is("TurnOff"))
+  {
+    lampOn = directive.is("TurnOn");
+  }
+  else if (directive.is("SetBrightness"))
+  {
+    brightness = constrain(directive.payload["brightness"] | brightness, 0, 100);
+  }
+  else if (directive.is("AdjustBrightness"))
+  {
+    brightness = constrain(brightness + (directive.payload["brightnessDelta"] | 0), 0, 100);
+  }
+  else if (directive.is("SetColorTemperature"))
+  {
+    kelvin = constrain(directive.payload["colorTemperatureInKelvin"] | kelvin, STEPS[0], STEPS[STEP_COUNT - 1]);
+  }
+  else if (directive.is("IncreaseColorTemperature"))
+  {
+    for (int i = 0; i < STEP_COUNT; i++)
+    {
+      if (STEPS[i] > kelvin)
+      {
+        kelvin = STEPS[i];
+        break;
+      }
+    }
+  }
+  else if (directive.is("DecreaseColorTemperature"))
+  {
+    for (int i = STEP_COUNT - 1; i >= 0; i--)
+    {
+      if (STEPS[i] < kelvin)
+      {
+        kelvin = STEPS[i];
+        break;
+      }
+    }
+  }
+  else
+  {
+    directive.error(AlexaErrorType::INVALID_DIRECTIVE, "This lamp switches, dims and changes its white").send();
+    return;
+  }
+
+  writeLamp();
+  sendState(directive.response());
+}
+
+void setup()
+{
+  Serial.begin(74880);
+  pinMode(WARM_PIN, OUTPUT);
+  pinMode(COLD_PIN, OUTPUT);
+  analogWriteRange(100);
+  writeLamp();
+
+  connectWiFi();
+
+  // MQTT user name, MQTT password, root topic
+  alexa.begin(ALEXA_USERNAME, ALEXA_PASSWORD, ALEXA_ROOT_TOPIC);
+
+  // The name Alexa shows, and the id of the endpoint: every device of an account has its own
+  AlexaDevice *lamp = alexa.getDevice("White Lamp", "esp-white-light");
+  lamp->setDisplayCategory(DisplayCategory::LIGHT);
+  lamp->addCapability(AlexaInterfaces::PowerController);
+  lamp->addCapability(AlexaInterfaces::BrightnessController);
+  lamp->addCapability(AlexaInterfaces::ColorTemperatureController);
+  lamp->addCapability(AlexaInterfaces::EndpointHealth);
+  lamp->onDirective(onDirective);
+}
+
+void loop()
+{
+  alexa.loop();
+}