PWM controlled by mqtt

WifiControlSensor/MQTT.ino

@@ -10,6 +10,7 @@ Adafruit_MQTT_Publish *mqtt_dht_humidity;
 Adafruit_MQTT_Publish *mqtt_dry;
 Adafruit_MQTT_Publish *mqtt_ip;
 Adafruit_MQTT_Publish *mqttGpio[MAXSUBSCRIPTIONS] = {};
+Adafruit_MQTT_Publish *mqttPwm[MAXSUBSCRIPTIONS] = {};
 
 #define FEED_MAX_SIZE 96
 
@@ -21,11 +22,14 @@ Adafruit_MQTT_Publish *mqttGpio[MAXSUBSCRIPTIONS] = {};
 #define DRY_FEED_FORMAT               "/feeds/%s/%s/dry"
 #define GPIO_FEED_FORMAT              "/feeds/%s/%s/gpio/%d"
 #define GPIO_SET_FEED_FORMAT          "/feeds/%s/%s/gpio/%d/set"
+#define PWM_FEED_FORMAT               "/feeds/%s/%s/gpio/%d"
+#define PWM_SET_FEED_FORMAT           "/feeds/%s/%s/gpio/%d/set"
 #define IP_FEED_FORMAT                "/feeds/%s/%s/configuration/ip/addr"
 
 // Should have less that MAXSUBSCRIPTIONS elements
 // MAXSUBSCRIPTIONS is defined is Adafruit_mqtt.h
 const int gpioWatched[] = CONFIG_MQTT_CONTROLLED_GPIO;
+const int pwmWatched[] = CONFIG_CONTROLLED_PWM;
 
 char *mqttId;
 
@@ -53,10 +57,21 @@ int MqttSetup(char *server, char *user, char *passwd, int port, char *hostname)
   mqtt_dry = MqttCreatePublisher(DRY_FEED_FORMAT, user, mqttId);
   mqtt_ip = MqttCreatePublisher(IP_FEED_FORMAT, user, mqttId);
 
+  if( NB_ELEMENTS(gpioWatched) + NB_ELEMENTS(pwmWatched) > MAXSUBSCRIPTIONS){
+    SKETCH_DEBUG_PRINTF("Too much gpio/pwm to control\n Nb gpio %d Nb pwm %d Max is %d", 
+                        NB_ELEMENTS(gpioWatched), NB_ELEMENTS(pwmWatched), MAXSUBSCRIPTIONS);
+    return -1;
+  }
+
   for (uint i = 0 ; i < NB_ELEMENTS(gpioWatched) && i < MAXSUBSCRIPTIONS; i++) {
     mqtt->subscribe(MqttCreateSubscribe(GPIO_SET_FEED_FORMAT, user, mqttId, gpioWatched[i]));
     mqttGpio[i] = MqttCreatePublisher(GPIO_FEED_FORMAT, user, mqttId, gpioWatched[i]);
   }
+
+  for (uint i = 0 ; i < NB_ELEMENTS(gpioWatched) && i < MAXSUBSCRIPTIONS; i++) {
+    mqtt->subscribe(MqttCreateSubscribe(PWM_SET_FEED_FORMAT, user, mqttId, pwmWatched[i]));
+    mqttPwm[i] = MqttCreatePublisher(PWM_FEED_FORMAT, user, mqttId, pwmWatched[i]);
+  }
   return 0;
 }
 
@@ -143,11 +158,11 @@ int MqttDhtPublish(float temp, float humidity) {
   return 0;
 }
 
-int getGpioFromSubscription(Adafruit_MQTT_Subscribe *subscription) {
-  char *temp = strstr(subscription->topic, "/gpio/");
+int getGpioFromSubscription(Adafruit_MQTT_Subscribe *subscription, const char *pattern) {
+  char *temp = strstr(subscription->topic, pattern);
   if (!temp)
     return -1;
-  String gpioStr(temp + strlen("/gpio/"));
+  String gpioStr(temp + strlen(pattern));
   int idx = gpioStr.indexOf("/");
   int gpio = gpioStr.substring(0, idx).toInt();
 
@@ -157,18 +172,18 @@ int getGpioFromSubscription(Adafruit_MQTT_Subscribe *subscription) {
     return -1;
 }
 
-int getGpioWatchedIndex(int gpio) {
-  for ( uint i = 0; i < NB_ELEMENTS(gpioWatched); i++) {
-    if (gpio == gpioWatched[i])
-      return i;
-  }
-  return -1;
-}
-
 void MqttChangeGpioValue(int gpio, int value) {
   pinMode(gpio, OUTPUT);
   digitalWrite(gpio, value);
-  int watchIdx = getGpioWatchedIndex(gpio);
+  int watchIdx = findIndex(gpio, gpioWatched);
+  if (watchIdx >= 0 ) {
+    mqttGpio[watchIdx]->publish(value);
+  }
+}
+
+void MqttChangePWMValue(int gpio, int value) {
+  analogWrite(gpio, value);
+  int watchIdx = findIndex(gpio, gpioWatched);
   if (watchIdx >= 0 ) {
     mqttGpio[watchIdx]->publish(value);
   }
@@ -178,13 +193,21 @@ void MqttCheckSubscription() {
   if (MqttConnect() == 0) {
     Adafruit_MQTT_Subscribe *subscription;
     while ((subscription = mqtt->readSubscription(0))) {
-      int gpio = getGpioFromSubscription(subscription);
-      SKETCH_DEBUG_PRINTF("Got Subscription for gpio %d\n", gpio);
-      if (gpio > 0 && getGpioWatchedIndex(gpio) >= 0) {
+      int gpio = getGpioFromSubscription(subscription, "/gpio/");
+      if (gpio > 0 && findIndex(gpio, gpioWatched) >= 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, pwmWatched) >= 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));
+      }
     }
   }
 }

WifiControlSensor/config.h

@@ -39,6 +39,10 @@
 #define CONFIG_SSID_NAME "ESPConfigurator"
 #endif
 
+#ifndef CONFIG_CONTROLLED_PWM
+#define CONFIG_CONTROLLED_PWM {}
+#endif
+
 #ifndef CONFIG_WEB_CONTROLLED_GPIO
 #define CONFIG_WEB_CONTROLLED_GPIO {}
 #endif

WifiControlSensor/config_device.h

@@ -28,6 +28,9 @@
 // Web controlled GPIO
 #define CONFIG_WEB_CONTROLLED_GPIO {2}
 
+// GPIO used in PWM
+#define CONFIG_CONTROLLED_PWM {}
+
 
 /* DEFAULT VALUE ALSO DEFINED IN CONFIG.H */
 //If this GPIO is LOW at boot, device will enter setup mode

WifiControlSensor/utils.h

@@ -4,3 +4,11 @@
 
 #define STRINGIFY(x) #x
 #define TOSTRING(x) STRINGIFY(x)
+
+int findIndex(int el, const int array[]){
+  for ( uint i = 0; i < NB_ELEMENTS(array); i++) {
+    if (el == array[i])
+      return i;
+  }
+  return -1;
+}