David
c3d02f462e
An interface without properties says beside its name what Alexa has to know of it; the library left both out. With a board and Alexa on 2026-09-28 the discovery of a doorbell was accepted (202), the endpoint was not listed, and its DoorbellPress was answered with 500 INTERNAL_SERVICE_EXCEPTION. DoorbellEventSource now always carries "proactivelyReported": true. SceneController carries "supportsDeactivation", false until the sketch calls setSupportsDeactivation(true); on another interface the call is refused and logged. The Scene example says that it can be undone. 148 host tests. Light: static RAM 30,616 B, flash 332,705 B (+140 B). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
// Doorbell: a button that tells Alexa when it is pressed (Alexa.DoorbellEventSource).
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//
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// The button connects the pin to ground; the internal pull-up makes the pin high while it is released. A level has
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// to hold for 50 ms before it counts. Every press publishes a DoorbellPress event on <root>/event. A press while
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// there is no session with the broker is lost: the library prints why it was not sent.
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//
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// This event has not been tried with Alexa yet.
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#include <Arduino.h>
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#include <ESP8266WiFi.h>
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#include <Alex2ESP.h>
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// Wi-Fi and the credentials of your Alex2MQTT account
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const char *WIFI_SSID = "";
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const char *WIFI_PASSWORD = "";
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const char *ALEXA_USERNAME = "";
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const char *ALEXA_PASSWORD = "";
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const char *ALEXA_ROOT_TOPIC = "";
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const uint8_t BUTTON_PIN = 14; // D5 on a Wemos D1 mini
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const unsigned long DEBOUNCE_MS = 50;
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Alex2ESP alexa;
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AlexaDevice *doorbell;
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bool pressed = false;
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bool lastLevel = false;
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unsigned long lastEdge = 0;
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// Joins the Wi-Fi network and returns after 30 s at the latest. Without a connection the sketch carries on: the
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// ESP8266 keeps trying, and alexa.loop() opens the MQTT session once Wi-Fi is up.
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void connectWiFi()
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{
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WiFi.mode(WIFI_STA);
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WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
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Serial.printf("\n[WIFI] Connecting to \"%s\"\n", WIFI_SSID);
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unsigned long started = millis();
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while (WiFi.status() != WL_CONNECTED && millis() - started < 30000)
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{
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delay(100);
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}
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if (WiFi.status() == WL_CONNECTED)
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{
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Serial.printf("[WIFI] Connected, IP address %s\n", WiFi.localIP().toString().c_str());
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}
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else
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{
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Serial.printf("[WIFI] No connection after 30 s (status %d): check WIFI_SSID and WIFI_PASSWORD. Still trying.\n",
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WiFi.status());
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}
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}
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void onDirective(AlexaDirective &directive)
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{
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if (directive.isReportState())
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{
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directive.stateReport().addHealthProp(EndpointHealth::OK).send();
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return;
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}
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directive.error(AlexaErrorType::INVALID_DIRECTIVE, "A doorbell takes no directives").send();
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}
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void setup()
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{
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Serial.begin(74880);
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pinMode(BUTTON_PIN, INPUT_PULLUP);
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connectWiFi();
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// MQTT user name, MQTT password, root topic
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alexa.begin(ALEXA_USERNAME, ALEXA_PASSWORD, ALEXA_ROOT_TOPIC);
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// The name Alexa shows, and the id of the endpoint: every device of an account has its own
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doorbell = alexa.getDevice("Front Door Bell", "esp-doorbell");
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doorbell->setDisplayCategory(DisplayCategory::DOORBELL);
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doorbell->addCapability(AlexaInterfaces::DoorbellEventSource);
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doorbell->addCapability(AlexaInterfaces::EndpointHealth);
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doorbell->onDirective(onDirective);
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}
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void loop()
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{
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alexa.loop();
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bool level = digitalRead(BUTTON_PIN) == LOW;
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if (level != lastLevel)
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{
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lastLevel = level;
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lastEdge = millis();
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}
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if (level != pressed && millis() - lastEdge >= DEBOUNCE_MS)
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{
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pressed = level;
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if (pressed)
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{
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Serial.println("[DOORBELL] pressed");
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doorbell->doorbellPress().send();
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}
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}
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}
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