diff --git a/sonoff/language/bg-BG.h b/sonoff/language/bg-BG.h
index 626c0b1b8..04cfcf066 100644
--- a/sonoff/language/bg-BG.h
+++ b/sonoff/language/bg-BG.h
@@ -148,6 +148,7 @@
 #define D_STOP "Стоп"
 #define D_SUBNET_MASK "Маска на подмрежата"
 #define D_SUBSCRIBE_TO "Записване за"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Успешно"
 #define D_SUNRISE "Изгрев"
 #define D_SUNSET "Залез"
diff --git a/sonoff/language/cs-CZ.h b/sonoff/language/cs-CZ.h
index e9d17bb8e..e4053ea75 100644
--- a/sonoff/language/cs-CZ.h
+++ b/sonoff/language/cs-CZ.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Maska podsítě"
 #define D_SUBSCRIBE_TO "Přihlaš se do"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "úspěšné."
 #define D_SUNRISE "Svítání"
 #define D_SUNSET "Soumrak"
diff --git a/sonoff/language/de-DE.h b/sonoff/language/de-DE.h
index ed3202919..d41097c0f 100644
--- a/sonoff/language/de-DE.h
+++ b/sonoff/language/de-DE.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Subnetzmaske"
 #define D_SUBSCRIBE_TO "abonniere"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "erfolgreich"
 #define D_SUNRISE "Sonnenaufgang"
 #define D_SUNSET "Sonnenuntergang"
diff --git a/sonoff/language/el-GR.h b/sonoff/language/el-GR.h
index 8e4cf7077..8a3fe75a5 100644
--- a/sonoff/language/el-GR.h
+++ b/sonoff/language/el-GR.h
@@ -148,6 +148,7 @@
 #define D_STOP "Τερματισμός"
 #define D_SUBNET_MASK "Μάσκα υποδικτύου"
 #define D_SUBSCRIBE_TO "Εγγραφή στο"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Επιτυχές"
 #define D_SUNRISE "Σούρουπο"
 #define D_SUNSET "Ηλιοβασίλεμα"
diff --git a/sonoff/language/en-GB.h b/sonoff/language/en-GB.h
index 794af57fa..e459cd02d 100644
--- a/sonoff/language/en-GB.h
+++ b/sonoff/language/en-GB.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Subnet Mask"
 #define D_SUBSCRIBE_TO "Subscribe to"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Successful"
 #define D_SUNRISE "Sunrise"
 #define D_SUNSET "Sunset"
diff --git a/sonoff/language/es-AR.h b/sonoff/language/es-AR.h
index 9dc72cf7c..9f2187bbf 100644
--- a/sonoff/language/es-AR.h
+++ b/sonoff/language/es-AR.h
@@ -148,6 +148,7 @@
 #define D_STOP "Detener"
 #define D_SUBNET_MASK "Máscara Subred"
 #define D_SUBSCRIBE_TO "Suscribir a"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Exitosa"
 #define D_SUNRISE "Salida del Sol"
 #define D_SUNSET "Puesta del Sol"
diff --git a/sonoff/language/fr-FR.h b/sonoff/language/fr-FR.h
index 06ada0874..539094b9f 100644
--- a/sonoff/language/fr-FR.h
+++ b/sonoff/language/fr-FR.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Masque sous-réseau"
 #define D_SUBSCRIBE_TO "Souscrire à"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Réussi"
 #define D_SUNRISE "Lever du jour"
 #define D_SUNSET "Tombée de la nuit"
diff --git a/sonoff/language/he-HE.h b/sonoff/language/he-HE.h
index 8437e1a05..9f3458889 100644
--- a/sonoff/language/he-HE.h
+++ b/sonoff/language/he-HE.h
@@ -148,6 +148,7 @@
 #define D_STOP "עצירה"
 #define D_SUBNET_MASK "רשת מסכת משנה"
 #define D_SUBSCRIBE_TO "הרשם ל"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "הצליח"
 #define D_SUNRISE "זריחה"
 #define D_SUNSET "שקיעה"
diff --git a/sonoff/language/hu-HU.h b/sonoff/language/hu-HU.h
index 393d250e7..649796121 100644
--- a/sonoff/language/hu-HU.h
+++ b/sonoff/language/hu-HU.h
@@ -148,6 +148,7 @@
 #define D_STOP "Leállítás"
 #define D_SUBNET_MASK "Alhálózati maszk"
 #define D_SUBSCRIBE_TO "Feliratkozás a(z)"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Sikeres"
 #define D_SUNRISE "Napkelte"
 #define D_SUNSET "Napnyugta"
diff --git a/sonoff/language/it-IT.h b/sonoff/language/it-IT.h
index 0f35e92b2..4d735426f 100644
--- a/sonoff/language/it-IT.h
+++ b/sonoff/language/it-IT.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Maschera sottorete"
 #define D_SUBSCRIBE_TO "Sottoscrivi a"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Riuscito"
 #define D_SUNRISE "Alba"
 #define D_SUNSET "Tramonto"
diff --git a/sonoff/language/nl-NL.h b/sonoff/language/nl-NL.h
index b8b159eff..dd3fb1806 100644
--- a/sonoff/language/nl-NL.h
+++ b/sonoff/language/nl-NL.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Subnet Masker"
 #define D_SUBSCRIBE_TO "Abonneer op"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Gelukt"
 #define D_SUNRISE "Zonsopgang"
 #define D_SUNSET "Zonsondergang"
diff --git a/sonoff/language/pl-PL.h b/sonoff/language/pl-PL.h
index 5d2db7afc..24e2f60ae 100644
--- a/sonoff/language/pl-PL.h
+++ b/sonoff/language/pl-PL.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Maska podsieci"
 #define D_SUBSCRIBE_TO "Subskrybuj do"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Powodzenie"
 #define D_SUNRISE "Wschód słońca"
 #define D_SUNSET "Zachód słońca"
diff --git a/sonoff/language/pt-BR.h b/sonoff/language/pt-BR.h
index 94d7bea00..3d24e2dbc 100644
--- a/sonoff/language/pt-BR.h
+++ b/sonoff/language/pt-BR.h
@@ -148,6 +148,7 @@
 #define D_STOP "Parar"
 #define D_SUBNET_MASK "Máscara sub rede"
 #define D_SUBSCRIBE_TO "Subescrever para"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Successo"
 #define D_SUNRISE "Nascer do sol"
 #define D_SUNSET "Por do sol"
diff --git a/sonoff/language/pt-PT.h b/sonoff/language/pt-PT.h
index 47dec4ea2..d675efe54 100644
--- a/sonoff/language/pt-PT.h
+++ b/sonoff/language/pt-PT.h
@@ -148,6 +148,7 @@
 #define D_STOP "Parar"
 #define D_SUBNET_MASK "Mascara sub rede"
 #define D_SUBSCRIBE_TO "Subescrever para"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Successo"
 #define D_SUNRISE "Sunrise"
 #define D_SUNSET "Sunset"
diff --git a/sonoff/language/ru-RU.h b/sonoff/language/ru-RU.h
index 038ba6615..50eabbc35 100644
--- a/sonoff/language/ru-RU.h
+++ b/sonoff/language/ru-RU.h
@@ -148,6 +148,7 @@
 #define D_STOP "Стоп"
 #define D_SUBNET_MASK "Маска Подсети"
 #define D_SUBSCRIBE_TO "Подписаться на"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Успешно"
 #define D_SUNRISE "Sunrise"
 #define D_SUNSET "Sunset"
diff --git a/sonoff/language/sk-SK.h b/sonoff/language/sk-SK.h
index ff05b471d..4f741ac51 100644
--- a/sonoff/language/sk-SK.h
+++ b/sonoff/language/sk-SK.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stop"
 #define D_SUBNET_MASK "Maska podsiete"
 #define D_SUBSCRIBE_TO "Prihlásiť do"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "úspešné."
 #define D_SUNRISE "Svitanie"
 #define D_SUNSET "Súmrak"
diff --git a/sonoff/language/sv-SE.h b/sonoff/language/sv-SE.h
index 9045b2e24..dd6b31469 100644
--- a/sonoff/language/sv-SE.h
+++ b/sonoff/language/sv-SE.h
@@ -148,6 +148,7 @@
 #define D_STOP "Stoppa"
 #define D_SUBNET_MASK "Nätmask"
 #define D_SUBSCRIBE_TO "Prenumera på"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Lyckat"
 #define D_SUNRISE "Soluppgång"
 #define D_SUNSET "Solnedgång"
diff --git a/sonoff/language/tr-TR.h b/sonoff/language/tr-TR.h
index f971c9ba2..f6f61ec56 100755
--- a/sonoff/language/tr-TR.h
+++ b/sonoff/language/tr-TR.h
@@ -148,6 +148,7 @@
 #define D_STOP "Durdur"
 #define D_SUBNET_MASK "Altağ Geçidi Maskesi"
 #define D_SUBSCRIBE_TO "Abone olunan"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Başarıyla Tamamlandı"
 #define D_SUNRISE "Gün doğumu"
 #define D_SUNSET "Gün batımı"
diff --git a/sonoff/language/uk-UK.h b/sonoff/language/uk-UK.h
index 1557a0d78..71b7665c1 100644
--- a/sonoff/language/uk-UK.h
+++ b/sonoff/language/uk-UK.h
@@ -148,6 +148,7 @@
 #define D_STOP "Стоп"
 #define D_SUBNET_MASK "Маска Підмережі"
 #define D_SUBSCRIBE_TO "Підписатись на"
+#define D_UNSUBSCRIBE_FROM "Unsubscribe from"
 #define D_SUCCESSFUL "Успішно"
 #define D_SUNRISE "Схід сонця"
 #define D_SUNSET "Захід сонця"
diff --git a/sonoff/language/zh-CN.h b/sonoff/language/zh-CN.h
index 4e3a7d9fd..dddf34a48 100644
--- a/sonoff/language/zh-CN.h
+++ b/sonoff/language/zh-CN.h
@@ -148,6 +148,7 @@
 #define D_STOP "停止"
 #define D_SUBNET_MASK "子网掩码"
 #define D_SUBSCRIBE_TO "订阅"
+#define D_UNSUBSCRIBE_FROM "退订"
 #define D_SUCCESSFUL "成功"
 #define D_SUNRISE "日出"
 #define D_SUNSET "日落"
diff --git a/sonoff/language/zh-TW.h b/sonoff/language/zh-TW.h
index f8526aa5b..ae6d4df07 100644
--- a/sonoff/language/zh-TW.h
+++ b/sonoff/language/zh-TW.h
@@ -148,6 +148,7 @@
 #define D_STOP "停止"
 #define D_SUBNET_MASK "子網遮罩"
 #define D_SUBSCRIBE_TO "訂閱"
+#define D_UNSUBSCRIBE_FROM "退訂"
 #define D_SUCCESSFUL "成功"
 #define D_SUNRISE "Sunrise"
 #define D_SUNSET "Sunset"
diff --git a/sonoff/my_user_config.h b/sonoff/my_user_config.h
index d447eed08..4cbcc169a 100644
--- a/sonoff/my_user_config.h
+++ b/sonoff/my_user_config.h
@@ -280,6 +280,7 @@
 // -- Rules ---------------------------------------
 #define USE_RULES                                // Add support for rules (+4k4 code)
   #define USE_EXPRESSION                         // Add support for expression evaluation in rules (+3k2 code, +64 bytes mem)
+  #define SUPPORT_MQTT_EVENT                     // Support trigger event with MQTT subscriptions (+3k5 code)
 
 // -- Internal Analog input -----------------------
 #define USE_ADC_VCC                              // Display Vcc in Power status. Disable for use as Analog input on selected devices
diff --git a/sonoff/xdrv_02_mqtt.ino b/sonoff/xdrv_02_mqtt.ino
index fa681e309..8721b42b2 100644
--- a/sonoff/xdrv_02_mqtt.ino
+++ b/sonoff/xdrv_02_mqtt.ino
@@ -110,12 +110,18 @@ void MqttDisconnect(void)
   MqttClient.disconnect();
 }
 
-void MqttSubscribeLib(char *topic)
+void MqttSubscribeLib(const char *topic)
 {
   MqttClient.subscribe(topic);
   MqttClient.loop();  // Solve LmacRxBlk:1 messages
 }
 
+void MqttUnsubscribeLib(const char *topic)
+{
+  MqttClient.unsubscribe(topic);
+  MqttClient.loop();  // Solve LmacRxBlk:1 messages
+}
+
 bool MqttPublishLib(const char* topic, bool retained)
 {
   bool result = MqttClient.publish(topic, mqtt_data, retained);
@@ -148,11 +154,16 @@ void MqttDisconnectedCb(void)
   MqttDisconnected(MqttClient.State());  // status codes are documented in file mqtt.h as tConnState
 }
 
-void MqttSubscribeLib(char *topic)
+void MqttSubscribeLib(const char *topic)
 {
   MqttClient.Subscribe(topic, 0);
 }
 
+void MqttUnsubscribeLib(const char *topic)
+{
+  MqttClient.Unsubscribe(topic, 0);
+}
+
 bool MqttPublishLib(const char* topic, bool retained)
 {
   return MqttClient.Publish(topic, mqtt_data, strlen(mqtt_data), 0, retained);
@@ -190,11 +201,16 @@ void MqttMyDataCb(String &topic, String &data)
   MqttDataHandler((char*)topic.c_str(), (uint8_t*)data.c_str(), data.length());
 }
 
-void MqttSubscribeLib(char *topic)
+void MqttSubscribeLib(const char *topic)
 {
   MqttClient.subscribe(topic, 0);
 }
 
+void MqttUnsubscribeLib(const char *topic)
+{
+  MqttClient.unsubscribe(topic, 0);
+}
+
 bool MqttPublishLib(const char* topic, bool retained)
 {
   return MqttClient.publish(topic, mqtt_data, strlen(mqtt_data), retained, 0);
@@ -251,13 +267,20 @@ void MqttRetryCounter(uint8_t value)
   mqtt_retry_counter = value;
 }
 
-void MqttSubscribe(char *topic)
+void MqttSubscribe(const char *topic)
 {
   snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_MQTT D_SUBSCRIBE_TO " %s"), topic);
   AddLog(LOG_LEVEL_DEBUG);
   MqttSubscribeLib(topic);
 }
 
+void MqttUnsubscribe(const char *topic)
+{
+  snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_MQTT D_UNSUBSCRIBE_FROM " %s"), topic);
+  AddLog(LOG_LEVEL_DEBUG);
+  MqttUnsubscribeLib(topic);
+}
+
 void MqttPublishDirect(const char* topic, bool retained)
 {
   char sretained[CMDSZ];
diff --git a/sonoff/xdrv_10_rules.ino b/sonoff/xdrv_10_rules.ino
index 08c6c362b..2a58ea880 100644
--- a/sonoff/xdrv_10_rules.ino
+++ b/sonoff/xdrv_10_rules.ino
@@ -75,6 +75,8 @@
 #define D_CMND_MULT "Mult"
 #define D_CMND_SCALE "Scale"
 #define D_CMND_CALC_RESOLUTION "CalcRes"
+#define D_CMND_SUBSCRIBE "Subscribe"
+#define D_CMND_UNSUBSCRIBE "Unsubscribe"
 
 #define D_JSON_INITIATED "Initiated"
 
@@ -105,8 +107,18 @@ const char kCompareOperators[] PROGMEM = "=\0>\0<\0|\0==!=>=<=";
   #define MAX_EXPRESSION_OPERATOR_PRIORITY    4
 #endif  // USE_EXPRESSION
 
-enum RulesCommands { CMND_RULE, CMND_RULETIMER, CMND_EVENT, CMND_VAR, CMND_MEM, CMND_ADD, CMND_SUB, CMND_MULT, CMND_SCALE, CMND_CALC_RESOLUTION };
-const char kRulesCommands[] PROGMEM = D_CMND_RULE "|" D_CMND_RULETIMER "|" D_CMND_EVENT "|" D_CMND_VAR "|" D_CMND_MEM "|" D_CMND_ADD "|" D_CMND_SUB "|" D_CMND_MULT "|" D_CMND_SCALE "|" D_CMND_CALC_RESOLUTION ;
+enum RulesCommands { CMND_RULE, CMND_RULETIMER, CMND_EVENT, CMND_VAR, CMND_MEM, CMND_ADD, CMND_SUB, CMND_MULT, CMND_SCALE, CMND_CALC_RESOLUTION, CMND_SUBSCRIBE, CMND_UNSUBSCRIBE };
+const char kRulesCommands[] PROGMEM = D_CMND_RULE "|" D_CMND_RULETIMER "|" D_CMND_EVENT "|" D_CMND_VAR "|" D_CMND_MEM "|" D_CMND_ADD "|" D_CMND_SUB "|" D_CMND_MULT "|" D_CMND_SCALE "|" D_CMND_CALC_RESOLUTION "|" D_CMND_SUBSCRIBE "|" D_CMND_UNSUBSCRIBE ;
+
+#ifdef SUPPORT_MQTT_EVENT
+  #include <LinkedList.h>                 // Import LinkedList library
+  typedef struct {
+    String Event;
+    String Topic;
+    String Key;
+  } MQTT_Subscription;
+  LinkedList<MQTT_Subscription> subscriptions;
+#endif    //SUPPORT_MQTT_EVENT
 
 String rules_event_value;
 unsigned long rules_timer[MAX_RULE_TIMERS] = { 0 };
@@ -577,6 +589,192 @@ void RulesTeleperiod(void)
   rules_teleperiod = 0;
 }
 
+#ifdef SUPPORT_MQTT_EVENT
+/********************************************************************************************/
+/*
+ * Rules: Process received MQTT message.
+ *        If the message is in our subscription list, trigger an event with the value parsed from MQTT data
+ * Input:
+ *      void      - We are going to access XdrvMailbox data directly.
+ * Return:
+ *      true      - The message is consumed.
+ *      false     - The message is not in our list.
+ */
+bool RulesMqttData(void)
+{
+  bool serviced = false;
+  if (XdrvMailbox.data_len < 1 || XdrvMailbox.data_len > 128) {
+    return false;
+  }
+  String sTopic = XdrvMailbox.topic;
+  String sData = XdrvMailbox.data;
+  //snprintf_P(log_data, sizeof(log_data), PSTR("RUL: MQTT Topic %s, Event %s"), XdrvMailbox.topic, XdrvMailbox.data);
+  //AddLog(LOG_LEVEL_DEBUG);
+  MQTT_Subscription event_item;
+  //Looking for matched topic
+  for (int index = 0; index < subscriptions.size(); index++) {
+    event_item = subscriptions.get(index);
+
+    //snprintf_P(log_data, sizeof(log_data), PSTR("RUL: Match MQTT message Topic %s with subscription topic %s"), sTopic.c_str(), event_item.Topic.c_str());
+    //AddLog(LOG_LEVEL_DEBUG);
+    if (sTopic.startsWith(event_item.Topic)) {
+      //This topic is subscribed by us, so serve it
+      serviced = true;
+      String value;
+      if (event_item.Key.length() == 0) {   //If did not specify Key
+        value = sData;
+      } else {      //If specified Key, need to parse Key/Value from JSON data
+        StaticJsonBuffer<400> jsonBuf;
+        JsonObject& jsonData = jsonBuf.parseObject(sData);
+        String key1 = event_item.Key;
+        String key2;
+        if (!jsonData.success()) break;       //Failed to parse JSON data, ignore this message.
+        int dot;
+        if ((dot = key1.indexOf('.')) > 0) {
+          key2 = key1.substring(dot+1);
+          key1 = key1.substring(0, dot);
+          if (!jsonData[key1][key2].success()) break;   //Failed to get the key/value, ignore this message.
+          value = (const char *)jsonData[key1][key2];
+        } else {
+          if (!jsonData[key1].success()) break;
+          value = (const char *)jsonData[key1];
+        }
+      }
+      value.trim();
+      //Create an new event. Cannot directly call RulesProcessEvent().
+      snprintf_P(event_data, sizeof(event_data), PSTR("%s=%s"), event_item.Event.c_str(), value.c_str());
+    }
+  }
+  return serviced;
+}
+
+/********************************************************************************************/
+/*
+ * Subscribe a MQTT topic (with or without key) and assign an event name to it
+ * Command Subscribe format:
+ *      Subscribe <event_name>, <topic> [, <key>]
+ *        This command will subscribe a <topic> and give it an event name <event_name>.
+ *        The optional parameter <key> is for parse the specified key/value from MQTT message
+ *            payload with JSON format.
+ *      Subscribe
+ *        Subscribe command without any parameter will list all topics currently subscribed.
+ * Input:
+ *      data      - A char buffer with all the parameters
+ *      data_len  - Length of the parameters
+ * Return:
+ *      A string include subscribed event, topic and key.
+ */
+String RulesSubscribe(const char *data, int data_len)
+{
+  MQTT_Subscription subscription_item;
+  String events;
+  if (data_len > 0) {
+    char parameters[data_len+1];
+    memcpy(parameters, data, data_len);
+    parameters[data_len] = '\0';
+    String event_name, topic, key;
+
+    char * pos = strtok(parameters, ",");
+    if (pos) {
+      event_name = Trim(pos);
+      pos = strtok(NULL, ",");
+      if (pos) {
+        topic = Trim(pos);
+        pos = strtok(NULL, ",");
+        if (pos) {
+          key = Trim(pos);
+        }
+      }
+    }
+    //snprintf_P(log_data, sizeof(log_data), PSTR("RUL: Subscribe command with parameters: %s, %s, %s."), event_name.c_str(), topic.c_str(), key.c_str());
+    //AddLog(LOG_LEVEL_DEBUG);
+    event_name.toUpperCase();
+    if (event_name.length() > 0 && topic.length() > 0) {
+      //Search all subscriptions
+      for (int index=0; index < subscriptions.size(); index++) {
+        if (subscriptions.get(index).Event.equals(event_name)) {
+          //If find exists one, remove it.
+          String stopic = subscriptions.get(index).Topic + "/#";
+          MqttUnsubscribe(stopic.c_str());
+          subscriptions.remove(index);
+          break;
+        }
+      }
+      //Add "/#" to the topic
+      if (!topic.endsWith("#")) {
+        if (topic.endsWith("/")) {
+          topic.concat("#");
+        } else {
+          topic.concat("/#");
+        }
+      }
+      //snprintf_P(log_data, sizeof(log_data), PSTR("RUL: New topic: %s."), topic.c_str());
+      //AddLog(LOG_LEVEL_DEBUG);
+      //MQTT Subscribe
+      subscription_item.Event = event_name;
+      subscription_item.Topic = topic.substring(0, topic.length() - 2);   //Remove "/#" so easy to match
+      subscription_item.Key = key;
+      subscriptions.add(subscription_item);
+
+      MqttSubscribe(topic.c_str());
+      events.concat(event_name + "," + topic
+        + (key.length()>0 ? "," : "")
+        + key);
+    } else {
+      events = D_JSON_WRONG_PARAMETERS;
+    }
+  } else {
+    //If did not specify the event name, list all subscribed event
+    for (int index=0; index < subscriptions.size(); index++) {
+      subscription_item = subscriptions.get(index);
+      events.concat(subscription_item.Event + "," + subscription_item.Topic
+        + (subscription_item.Key.length()>0 ? "," : "")
+        + subscription_item.Key + "; ");
+    }
+  }
+  return events;
+}
+
+/********************************************************************************************/
+/*
+ * Unsubscribe specified MQTT event. If no event specified, Unsubscribe all.
+ * Command Unsubscribe format:
+ *      Unsubscribe [<event_name>]
+ * Input:
+ *      data      - Event name
+ *      data_len  - Length of the parameters
+ * Return:
+ *      list all the events unsubscribed.
+ */
+String RulesUnsubscribe(const char * data, int data_len)
+{
+  MQTT_Subscription subscription_item;
+  String events;
+  if (data_len > 0) {
+    for (int index = 0; index < subscriptions.size(); index++) {
+      subscription_item = subscriptions.get(index);
+      if (subscription_item.Event.equalsIgnoreCase(data)) {
+        String stopic = subscription_item.Topic + "/#";
+        MqttUnsubscribe(stopic.c_str());
+        events = subscription_item.Event;
+        subscriptions.remove(index);
+        break;
+      }
+    }
+  } else {
+    //If did not specify the event name, unsubscribe all event
+    String stopic;
+    while (subscriptions.size() > 0) {
+      events.concat(subscriptions.get(0).Event + "; ");
+      stopic = subscriptions.get(0).Topic + "/#";
+      MqttUnsubscribe(stopic.c_str());
+      subscriptions.remove(0);
+    }
+  }
+  return events;
+}
+#endif //     SUPPORT_MQTT_EVENT
+
 #ifdef USE_EXPRESSION
 /********************************************************************************************/
 /*
@@ -1026,6 +1224,14 @@ bool RulesCommand(void)
       }
     }
     snprintf_P(mqtt_data, sizeof(mqtt_data), S_JSON_COMMAND_INDEX_SVALUE, command, index, vars[index -1]);
+#ifdef SUPPORT_MQTT_EVENT
+  } else if (CMND_SUBSCRIBE == command_code) {			//MQTT Subscribe command. Subscribe <Event>, <Topic> [, <Key>]
+    String result = RulesSubscribe(XdrvMailbox.data, XdrvMailbox.data_len);
+    snprintf_P(mqtt_data, sizeof(mqtt_data), S_JSON_COMMAND_SVALUE, command, result.c_str());
+  } else if (CMND_UNSUBSCRIBE == command_code) {			//MQTT Un-subscribe command. UnSubscribe <Event>
+    String result = RulesUnsubscribe(XdrvMailbox.data, XdrvMailbox.data_len);
+    snprintf_P(mqtt_data, sizeof(mqtt_data), S_JSON_COMMAND_SVALUE, command, result.c_str());
+#endif        //SUPPORT_MQTT_EVENT
   }
   else serviced = false;  // Unknown command
 
@@ -1067,6 +1273,11 @@ bool Xdrv10(uint8_t function)
     case FUNC_RULES_PROCESS:
       result = RulesProcess();
       break;
+#ifdef SUPPORT_MQTT_EVENT
+    case FUNC_MQTT_DATA:
+      result = RulesMqttData();
+      break;
+#endif    //SUPPORT_MQTT_EVENT
   }
   return result;
 }