134 lines
3.9 KiB
C++
134 lines
3.9 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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#define FEED_MAX_SIZE 64
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#define TEMPERATURE_FEED_FORMAT "/feeds/%s/temperature"
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#define PRESSURE_FEED_FORMAT "/feeds/%s/pressure"
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char temperatureFeed[FEED_MAX_SIZE] = {};
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char pressureFeed[FEED_MAX_SIZE] = {};
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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_FEED_FORMAT "/feeds/%s/gpio/%d"
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#define GPIO_SET_FEED_FORMAT "/feeds/%s/gpio/%d/set"
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char *mqttId;
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char GPIO_FEED[MAXSUBSCRIPTIONS][FEED_MAX_SIZE] = {};
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char GPIO_SET_FEED[MAXSUBSCRIPTIONS][FEED_MAX_SIZE] = {};
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Adafruit_MQTT_Publish * mqttGpio[MAXSUBSCRIPTIONS] = {};
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int MqttSetup(char *server, char *user, char *passwd, int port, char * hostname) {
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mqttId = hostname;
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snprintf(temperatureFeed, FEED_MAX_SIZE, TEMPERATURE_FEED_FORMAT, mqttId);
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snprintf(pressureFeed, FEED_MAX_SIZE, PRESSURE_FEED_FORMAT, mqttId);
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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, temperatureFeed);
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mqtt_pressure = new Adafruit_MQTT_Publish(mqtt, pressureFeed);
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for (int i = 0 ; i < NB_ELEMENTS(gpioWatched) && i < MAXSUBSCRIPTIONS; i++) {
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snprintf(GPIO_FEED[i], FEED_MAX_SIZE, GPIO_FEED_FORMAT, mqttId, gpioWatched[i]);
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snprintf(GPIO_SET_FEED[i], FEED_MAX_SIZE, GPIO_SET_FEED_FORMAT, mqttId, gpioWatched[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 MqttIsConnected() {
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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 MqttConnect() {
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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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SKETCH_DEBUG_PRINTLN(mqtt->connectErrorString(ret));
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SKETCH_DEBUG_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 MqttPublish(double temp, double pressure) {
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if (MqttConnect() == 0) {
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SKETCH_DEBUG_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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char *temp = strstr(subscription->topic, "/gpio/");
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if (!temp)
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return -1;
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String gpioStr(temp + strlen("/gpio/"));
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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 MqttChangeGpioValue(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 MqttCheckSubscription() {
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if (MqttConnect() == 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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SKETCH_DEBUG_PRINT("Got Subscription for gpio ");
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SKETCH_DEBUG_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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SKETCH_DEBUG_PRINT("Receive data: ");
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SKETCH_DEBUG_PRINTLN(value);
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MqttChangeGpioValue(gpio, atoi(value));
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}
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}
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}
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}
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