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secrets.h
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#include <PubSubClient.h>
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#include <ESP8266WiFi.h>
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#include "secrets.h"
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const int feedButtonPin = 0;
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const int publishTimeout = 2000;
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const int feedButtonHoldTime = 50;
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const String payload = "penni";
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char* topic = "control/button";
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String clientName;
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WiFiClient wifiClient;
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PubSubClient client(server, port, callback, wifiClient);
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void callback(char* topic, byte* payload, unsigned int length) {
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// handle message arrived
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}
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String macToStr(const uint8_t* mac)
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{
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String result;
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for (int i = 0; i < 6; ++i) {
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result += String(mac[i], 16);
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if (i < 5)
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result += ':';
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}
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return result;
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}
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void setup() {
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pinMode(feedButtonPin, INPUT_PULLUP);
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Serial.begin(115200);
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delay(10);
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Serial.println("");
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Serial.print("Connecting to ");
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Serial.println(ssid);
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("");
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Serial.println("WiFi connected");
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Serial.println("IP address: ");
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Serial.println(WiFi.localIP());
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// Generate client name based on MAC address and last 8 bits of microsecond counter
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clientName += "esp8266-";
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uint8_t mac[6];
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WiFi.macAddress(mac);
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clientName += macToStr(mac);
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clientName += "-";
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clientName += String(micros() & 0xff, 16);
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Serial.print("Connecting to ");
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Serial.print(server);
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Serial.print(" as ");
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Serial.println(clientName);
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if (client.connect((char*) clientName.c_str())) {
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Serial.println("Connected to MQTT broker");
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Serial.print("Topic is: ");
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Serial.println(topic);
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if (client.publish(topic, "control/button \"penni\" online")) {
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Serial.println("Publish ok");
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}
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else {
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Serial.println("Publish failed");
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}
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} else {
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Serial.println("MQTT connect failed");
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Serial.println("Will reset and try again...");
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abort();
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}
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}
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void loop() {
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checkButton();
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}
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void checkButton() {
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if (digitalRead(feedButtonPin) == LOW) {
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long feedButtonPressedTime = millis();
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while (digitalRead(feedButtonPin) == LOW) {
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if (feedButtonPressedTime + feedButtonHoldTime < millis()) {
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if (client.connected()){
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sendMQTTMessage();
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} else {
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Serial.println("Disconnected... reconnecting");
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if (client.connect((char*) clientName.c_str())) {
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Serial.println("Connected to MQTT broker");
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sendMQTTMessage();
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};
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};
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while (digitalRead(feedButtonPin) == LOW) {
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delay(100);
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}; //Prevents multiple publishings
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}
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}
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}
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}
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void sendMQTTMessage() {
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Serial.print("Sending payload: ");
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Serial.println(payload);
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if (client.publish(topic, (char*) payload.c_str())) {
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Serial.println("Publish ok");
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} else {
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Serial.println("Publish failed");
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}
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}
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