120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
// Create an ESP8266 WiFiClient class to connect to the MQTT server.
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WiFiClient client;
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Adafruit_MQTT_Client *mqtt;
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Adafruit_MQTT_Publish *mqtt_temp;
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Adafruit_MQTT_Publish *mqtt_pressure;
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#define NB_ELEMENTS(x) (sizeof(x)/ sizeof(x[0]))
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const char TEMPERATURE_FEED[] = "/feeds/temperature";
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const char PRESSURE_FEED[] = "/feeds/pressure";
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// Should have less that MAXSUBSCRIPTIONS elements
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// MAXSUBSCRIPTIONS is defined is Adafruit_mqtt.h
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const int gpioWatched[] = {12, 13};
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#define GPIO_BASE "/feeds/gpio/"
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const char *GPIO_FEED[] = { GPIO_BASE"12", GPIO_BASE"13"};
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const char *GPIO_SET_FEED[] = { GPIO_BASE"12/set", GPIO_BASE"13/set"};
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Adafruit_MQTT_Publish * mqttGpio[MAXSUBSCRIPTIONS] = {};
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int setupMQTT(char *server, char *user, char *passwd, int port) {
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// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
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mqtt = new Adafruit_MQTT_Client(&client, server, port, user, passwd);
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mqtt_temp = new Adafruit_MQTT_Publish(mqtt, TEMPERATURE_FEED);
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mqtt_pressure = new Adafruit_MQTT_Publish(mqtt, PRESSURE_FEED);
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for (int i = 0 ; i < NB_ELEMENTS(gpioWatched) && i < MAXSUBSCRIPTIONS; i++) {
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Adafruit_MQTT_Subscribe *gpioSet = new Adafruit_MQTT_Subscribe(mqtt, GPIO_SET_FEED[i]);
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mqtt->subscribe(gpioSet);
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Adafruit_MQTT_Publish *gpio = new Adafruit_MQTT_Publish(mqtt, GPIO_FEED[i]);
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mqttGpio[i] = gpio;
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}
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return 0;
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}
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int MQTT_isConnected() {
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return mqtt->connected();
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}
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// Function to connect and reconnect as necessary to the MQTT server.
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// Should be called in the loop function and it will take care if connecting.
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int MQTT_connect() {
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int8_t ret;
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// Stop if already connected.
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if (mqtt->connected()) {
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return 0;
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}
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uint8_t retries = 3;
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while ((ret = mqtt->connect()) != 0) { // connect will return 0 for connected
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Serial.println(mqtt->connectErrorString(ret));
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Serial.println("Retrying MQTT connection ...");
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mqtt->disconnect();
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delay(100); // wait
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retries--;
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if (retries == 0) {
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return -1;
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}
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}
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return 0;
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}
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int publishMQTT(double temp, double pressure) {
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if (MQTT_connect() == 0) {
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Serial.println("publishing !");
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mqtt_temp->publish(temp);
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mqtt_pressure->publish(pressure);
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}
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return 0;
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}
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int getGpioFromSubscription(Adafruit_MQTT_Subscribe *subscription) {
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if (!strstr(subscription->topic, GPIO_BASE))
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return -1;
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String gpioStr(subscription->topic + strlen(GPIO_BASE));
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int idx = gpioStr.indexOf("/");
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int gpio = gpioStr.substring(0, idx).toInt();
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if (gpio >= 0 && gpio < 32 )
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return gpio;
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else
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return -1;
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}
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int getGpioWatchedIndex(int gpio) {
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for ( int i = 0; i < NB_ELEMENTS(gpioWatched); i++) {
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if (gpio == gpioWatched[i])
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return i;
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}
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return -1;
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}
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void changeGpioValue(int gpio, int value) {
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pinMode(gpio, OUTPUT);
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digitalWrite(gpio, value);
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int watchIdx = getGpioWatchedIndex(gpio);
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if (watchIdx >= 0 ) {
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mqttGpio[watchIdx]->publish(value);
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}
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}
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void checkMqttSubscription() {
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if (MQTT_connect() == 0) {
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Adafruit_MQTT_Subscribe *subscription;
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while (subscription = mqtt->readSubscription(0)) {
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int gpio = getGpioFromSubscription(subscription);
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Serial.print("Got Subscription for gpio ");
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Serial.println(gpio);
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if (gpio > 0 && getGpioWatchedIndex(gpio) >= 0) {
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char *value = (char *) subscription->lastread;
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Serial.print("Receive data: ");
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Serial.println(value);
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changeGpioValue(gpio, atoi(value));
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}
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}
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}
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}
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