amd64bit · November 21, 2017 14:55 · Jun 4, 2017
diff --git a/MQTTWemosButton.ino b/MQTTWemosButton.ino
@@ -0,0 +1,179 @@
+/***************************************************
+  MQTT Button on Wemos
+
+  James Sutton 2017 - jsutton.co.uk
+ ****************************************************/
+#include <ESP8266WiFi.h>
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
+
+/************************* WiFi Access Point *********************************/
+
+#define WLAN_SSID       "WIFI SSID"
+#define WLAN_PASS       "WIFI KEY"
+
+/************************* MQTT Setup *********************************/
+
+#define MQTT_SERVER      "__SERVER__"
+#define MQTT_SERVERPORT  1883                   // use 8883 for SSL
+#define MQTT_USERNAME    "__USERNAME__"
+#define MQTT_PASSWORD         "__PASSWORD__"
+
+/************************* Button Config  *********************************/
+
+const int buttonPin = D5;
+
+/************ Global State (you don't need to change this!) ******************/
+
+// Create an ESP8266 WiFiClient class to connect to the MQTT server.
+WiFiClient client;
+// or... use WiFiFlientSecure for SSL
+//WiFiClientSecure client;
+
+// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
+Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, MQTT_SERVERPORT, MQTT_USERNAME, MQTT_PASSWORD);
+
+int buttonState;             // the current reading from the input pin
+int lastButtonState = LOW;   // the previous reading from the input pin
+
+// the following variables are unsigned long's because the time, measured in miliseconds,
+// will quickly become a bigger number than can be stored in an int.
+unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
+unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers
+
+/****************************** Feeds ***************************************/
+
+// Setup a feed for publishing.
+Adafruit_MQTT_Publish buttonPub = Adafruit_MQTT_Publish(&mqtt, MQTT_USERNAME "/buttonPub");
+
+/*************************** Sketch Code ************************************/
+
+// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
+// for some reason (only affects ESP8266, likely an arduino-builder bug).
+void MQTT_connect();
+
+void setup() {
+  pinMode(buttonPin, INPUT);
+
+  Serial.begin(115200);
+  delay(10);
+
+  Serial.println(F("MQTT Emergency Button"));
+
+  // Connect to WiFi access point.
+  Serial.println(); Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(WLAN_SSID);
+
+  WiFi.begin(WLAN_SSID, WLAN_PASS);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+
+  Serial.println("WiFi connected");
+  Serial.println("IP address: "); Serial.println(WiFi.localIP());
+
+  // Send Hello World Notification
+   MQTT_connect();
+
+
+  // Now we can publish stuff!
+  Serial.print(F("\nSending Hello!"));
+  Serial.print("...");
+  if (! buttonPub.publish("Hello")) {
+    Serial.println(F("Failed"));
+  } else {
+    Serial.println(F("OK!"));
+  }
+
+
+}
+
+
+void loop() {
+  // read the state of the switch into a local variable:
+  int reading = digitalRead(buttonPin);
+
+  // check to see if you just pressed the button
+  // (i.e. the input went from LOW to HIGH),  and you've waited
+  // long enough since the last press to ignore any noise:
+
+  // If the switch changed, due to noise or pressing:
+  if (reading != lastButtonState) {
+    // reset the debouncing timer
+    lastDebounceTime = millis();
+  }
+
+  if ((millis() - lastDebounceTime) > debounceDelay) {
+    // whatever the reading is at, it's been there for longer
+    // than the debounce delay, so take it as the actual current state:
+
+    // if the button state has changed:
+    if (reading != buttonState) {
+      buttonState = reading;
+
+      // only toggle the LED if the new button state is HIGH
+      if (buttonState == HIGH) {
+        sendUpdate();
+      }
+    }
+  }
+
+  // save the reading.  Next time through the loop,
+  // it'll be the lastButtonState:
+  lastButtonState = reading;
+}
+
+void sendUpdate() {
+  // Ensure the connection to the MQTT server is alive (this will make the first
+  // connection and automatically reconnect when disconnected).  See the MQTT_connect
+  // function definition further below.
+  MQTT_connect();
+
+
+  // Now we can publish stuff!
+  Serial.print(F("\nSending button press!"));
+  Serial.print("...");
+  if (! buttonPub.publish(1)) {
+    Serial.println(F("Failed"));
+  } else {
+    Serial.println(F("OK!"));
+  }
+
+  // ping the server to keep the mqtt connection alive
+  // NOT required if you are publishing once every KEEPALIVE seconds
+  /*
+    if(! mqtt.ping()) {
+    mqtt.disconnect();
+    }
+  */
+}
+
+// Function to connect and reconnect as necessary to the MQTT server.
+// Should be called in the loop function and it will take care if connecting.
+void MQTT_connect() {
+  int8_t ret;
+
+  // Stop if already connected.
+  if (mqtt.connected()) {
+    return;
+  }
+
+  Serial.print("Connecting to MQTT... ");
+
+  uint8_t retries = 3;
+  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
+    Serial.println(mqtt.connectErrorString(ret));
+    Serial.println("Retrying MQTT connection in 5 seconds...");
+    mqtt.disconnect();
+    delay(5000);  // wait 5 seconds
+    retries--;
+    if (retries == 0) {
+      // basically die and wait for WDT to reset me
+      while (1);
+    }
+  }
+  Serial.println("MQTT Connected!");
+}
No results found