Domotique/WifiControlSensor/MQTT.ino

#ifndef CONFIG_DISABLE_MQTT
#include <stdarg.h>
#include "utils.h"
#include "MQTT.h"

#define MAX_PIN 15
#define MAX_GPIO_OBSERVED (MAXSUBSCRIPTIONS*2)
Adafruit_MQTT_Client *mqtt;
Adafruit_MQTT_Publish *mqtt_ip;
Adafruit_MQTT_Publish *mqttGpio[MAXSUBSCRIPTIONS] = {};
Adafruit_MQTT_Publish *mqttPwm[MAXSUBSCRIPTIONS] = {};
Adafruit_MQTT_Publish *mqttGpioObserved[MAX_GPIO_OBSERVED] = {};
gpioInfo mqttIRQ[MAX_PIN + 1] = {};

#define FEED_MAX_SIZE 96

char *mqttId;

bool isMqttConfigured = false;
bool useMqtts = false;


int MqttSetup(char *server, char *user, char *passwd, int port, char *hostname) {
  mqttId = hostname;
  useMqtts = (port == 8883);
  isMqttConfigured = server[0] != '\0';

  if (!isMqttConfigured)
    return 0;

#ifndef CONFIG_DISABLE_SSL
  if (useMqtts)
    mqtt = new Adafruit_MQTT_Client(new WiFiClientSecure(), server, port, user, passwd);
  else
#endif
    mqtt = new Adafruit_MQTT_Client(new WiFiClient(), server, port, user, passwd);

  mqtt_ip = MqttCreatePublisher(0, 1, IP_FEED_FORMAT, user, mqttId);

  if (NB_ELEMENTS(gpioControlled) + NB_ELEMENTS(pwmControlled) > MAXSUBSCRIPTIONS) {
    SKETCH_DEBUG_PRINTF("Too much gpio/pwm to control\n Nb gpio %d Nb pwm %d Max is %d",
                        NB_ELEMENTS(gpioControlled), NB_ELEMENTS(pwmControlled), MAXSUBSCRIPTIONS);
    return -1;
  }
  if (NB_ELEMENTS(gpioObserved) > MAX_GPIO_OBSERVED) {
    SKETCH_DEBUG_PRINTF("Too much gpio observed\n Nb gpio %d Nb is %d",
                        NB_ELEMENTS(gpioObserved), MAX_GPIO_OBSERVED);
    return -1;
  }

  for (uint i = 0 ; i < NB_ELEMENTS(gpioControlled); i++) {
    mqtt->subscribe(MqttCreateSubscribe(GPIO_SET_FEED_FORMAT, user, mqttId, gpioControlled[i]));
    mqttGpio[i] = MqttCreatePublisher(0, 0, GPIO_FEED_FORMAT, user, mqttId, gpioControlled[i]);
  }

  for (uint i = 0 ; i < NB_ELEMENTS(gpioObserved) && i < MAX_GPIO_OBSERVED ; i++) {
    mqttGpioObserved[i] = MqttCreatePublisher(0, 0, GPIO_FEED_FORMAT, user, mqttId, gpioObserved[i]);
    new HIB(gpioObserved[i], HIGH, MqttNofityIRQ , MqttNofityIRQ, NULL );
  }

  for (uint i = 0 ; i < NB_ELEMENTS(pwmControlled); i++) {
    mqtt->subscribe(MqttCreateSubscribe(PWM_SET_FEED_FORMAT, user, mqttId, pwmControlled[i]));
    mqttPwm[i] = MqttCreatePublisher(0, 0, PWM_FEED_FORMAT, user, mqttId, pwmControlled[i]);
  }

  return 0;
}

Adafruit_MQTT_Publish *MqttCreatePublisher( uint8_t qos, uint8_t retain, const char *fmt, ...) {
  char buf[FEED_MAX_SIZE];
  va_list args;
  va_start (args, fmt);
  vsnprintf(buf, sizeof(buf), (const char *)fmt, args);
  va_end(args);
  return new Adafruit_MQTT_Publish(mqtt, strdup(buf), qos, retain);
}


int MqttBatchPublish(std::vector<struct mqttInfo> tab, ...) {
  if (MqttConnect()) {
    SKETCH_DEBUG_PRINTLN("cannot connect to mqtt");
    return -1;
  }
  for (auto info : tab) {
    char buf[FEED_MAX_SIZE];
    va_list args;
    va_start (args, tab);
    vsnprintf(buf, sizeof(buf), (const char *)info.topic, args);
    va_end(args);
    SKETCH_DEBUG_PRINTF("publishing %f for %s\n", info.value, buf);
    Adafruit_MQTT_Publish client(mqtt, buf, info.qos, info.retain);
    if (!client.publish(info.value))
      SKETCH_DEBUG_PRINTLN("Fail :(");
  }
  return 0;
}

Adafruit_MQTT_Subscribe *MqttCreateSubscribe(const char *fmt, ...) {
  char buf[FEED_MAX_SIZE];
  va_list args;
  va_start (args, fmt);
  vsnprintf(buf, sizeof(buf), (const char *)fmt, args);
  va_end(args);
  return new Adafruit_MQTT_Subscribe(mqtt, strdup(buf));
}

int MqttIsConnected() {
  return (isMqttConfigured && (mode == BOOTMODE_NORMAL)) ? mqtt->connected() : 0;
}

// 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.
int MqttConnect() {
  int8_t ret;

  if (!isMqttConfigured || mode != BOOTMODE_NORMAL)
    return -1;

  // Stop if already connected.
  if (mqtt->connected()) {
    return 0;
  }

  uint8_t retries = 3;
  while ((ret = mqtt->connect()) != 0) { // connect will return 0 for connected
    SKETCH_DEBUG_PRINTLN(mqtt->connectErrorString(ret));
    SKETCH_DEBUG_PRINTLN("Retrying MQTT connection ...");
    mqtt->disconnect();
    delay(100);  // wait
    retries--;
    if (retries == 0) {
      return -1;
    }
  }
  return 0;
}

template<typename T> int MqttPublish(Adafruit_MQTT_Publish *publisher, T value) {
  if (MqttConnect() == 0) {
    publisher->publish(value);
    return 0;
  }
  return -1;
}

int MqttPublishIP(const String &ip) {
  return MqttPublish(mqtt_ip, ip.c_str());
}

int getGpioFromSubscription(Adafruit_MQTT_Subscribe *subscription, const char *pattern) {
  char *temp = strstr(subscription->topic, pattern);
  if (!temp)
    return -1;
  String gpioStr(temp + strlen(pattern));
  int idx = gpioStr.indexOf("/");
  int gpio = gpioStr.substring(0, idx).toInt();

  if (gpio >= 0 && gpio < 32 )
    return gpio;
  else
    return -1;
}

void MqttNofityIRQ(uint8_t gpio, int value) {
  mqttIRQ[gpio].updated = 1;
  mqttIRQ[gpio].value = value;
}

void MqttNofity(int gpio, int value) {
  if (MqttIsConnected()) {
    int watchIdx = findIndex(gpio, gpioControlled);
    if (watchIdx >= 0 ) {
      mqttGpio[watchIdx]->publish(value);
    } else {
      watchIdx = findIndex(gpio, gpioObserved);
      if (watchIdx >= 0 )
        mqttGpioObserved[watchIdx]->publish(value);
    }
  }
}

void MqttChangeGpioValue(int gpio, int value) {
  pinMode(gpio, OUTPUT);
  digitalWrite(gpio, value);
  MqttNofity(gpio, value);
}

void MqttChangePWMValue(int gpio, int value) {
  analogWrite(gpio, value);
  MqttNofity(gpio, value);
}

void MqttCheckIRQ() {
  for (uint i = 0 ; i < NB_ELEMENTS(mqttIRQ); i++) {
    if (mqttIRQ[i].updated == 1) {
      mqttIRQ[i].updated = 0;
      MqttNofity(i, mqttIRQ[i].value);
    }
  }

}

void MqttCheckSubscription() {
  if (MqttConnect() == 0) {
    Adafruit_MQTT_Subscribe *subscription;
    while ((subscription = mqtt->readSubscription(0))) {
      int gpio = getGpioFromSubscription(subscription, "/gpio/");
      if (gpio > 0 && findIndex(gpio, gpioControlled) >= 0) {
        SKETCH_DEBUG_PRINTF("Got Subscription for GPIO %d\n", gpio);
        char *value = (char *) subscription->lastread;
        SKETCH_DEBUG_PRINTF("Receive data: %s\n", value);
        MqttChangeGpioValue(gpio, atoi(value));
      }

      gpio = getGpioFromSubscription(subscription, "/pwm/");
      if (gpio > 0 && findIndex(gpio, pwmControlled) >= 0) {
        SKETCH_DEBUG_PRINTF("Got Subscription for PWM %d\n", gpio);
        char *value = (char *) subscription->lastread;
        SKETCH_DEBUG_PRINTF("Receive data: %s\n", value);
        MqttChangePWMValue(gpio, atoi(value));
      }
    }
  }
}
#endif