diff --git a/config.json b/config.json
index 3a9bb38..acfe21e 100644
--- a/config.json
+++ b/config.json
@@ -5,6 +5,8 @@
     "brokerCa": "/home/wn/server-ca.crt",
     "disableDatabaseAccess": true,
     "mongoDbUrl": "mongodb://localhost/hottis",
+    "checkPeriod": 5,
+    "alarmRepeatPeriod": 15,
     "smtpHost": "localhost",
     "smtpPort": 25,
     "smtpSender": "dispatcher@hottis.de",
diff --git a/dist/log.js b/dist/log.js
index 5810c8d..eab4ad0 100644
--- a/dist/log.js
+++ b/dist/log.js
@@ -30,7 +30,7 @@ function setLevel(value) {
     }
 }
 exports.setLevel = setLevel;
-function sendAlarmMail(message) {
+function sendAlarmMail(subject, message) {
     let transport = nodemailer.createTransport({
         host: config.dict.smtpHost,
         port: config.dict.smtpPort,
@@ -42,12 +42,12 @@ function sendAlarmMail(message) {
     let mail = {
         from: config.dict.smtpSender,
         to: config.dict.smtpReceiver,
-        subject: "Alarm from Dispatcher",
+        subject: subject,
         text: message
     };
     transport.sendMail(mail)
         .then((v) => {
-        info(`Alarm mail sent, ${message}, ${v.response}`);
+        info(`Mail sent, ${subject}, ${message}, ${v.response}`);
     })
         .catch((reason) => {
         error(`Failure when sending alarm mail: ${message}, ${reason}`);
diff --git a/dist/main.js b/dist/main.js
index c067ede..844893e 100644
--- a/dist/main.js
+++ b/dist/main.js
@@ -9,7 +9,7 @@ const MissingEventDetector = require("./missingeventdetector");
 log.info("Dispatcher starting");
 config.readConfig();
 let dispatcher = new mqtt.MqttDispatcher(config.dict.brokerUrl, config.dict.brokerUser, config.dict.brokerPass, config.dict.brokerCa);
-const ESP_THERM_TOPIC = 'IoT/espThermometer3/#';
+const ESP_THERM_TOPIC = 'IoT/espThermometer2/#';
 dispatcher.register(ESP_THERM_TOPIC, 'toJson', EspThermToJson.espThermToJson);
 let missingeventdetector = new MissingEventDetector.MissingEventDetector();
 dispatcher.register(ESP_THERM_TOPIC, 'MissingEventDetector', missingeventdetector);
diff --git a/dist/missingeventdetector.js b/dist/missingeventdetector.js
index 6020ea5..1648b88 100644
--- a/dist/missingeventdetector.js
+++ b/dist/missingeventdetector.js
@@ -3,7 +3,7 @@ Object.defineProperty(exports, "__esModule", { value: true });
 const log = require("./log");
 const CallChain = require("./callchain");
 const Processor = require("./processor");
-const CHECK_PERIOD = 60; // seconds
+const config = require("./config");
 class ClientEntry {
 }
 class MissingEventProcessor extends Processor.AProcessor {
@@ -15,11 +15,18 @@ class MissingEventProcessor extends Processor.AProcessor {
                 let currentTime = new Date().getTime();
                 let elapsedTime = currentTime - value.lastEvent;
                 log.info(`MissingEventProcessor: Checking ${key}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`);
-                if ((value.avgDelay != 0) && (elapsedTime > (value.avgDelay * 3))) {
-                    log.sendAlarmMail(`Missing Event Detected: ${key}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`);
+                if (value.alarmState && ((value.lastAlarmMessage + config.dict.alarmRepeatPeriod * 1000) < currentTime)) {
+                    value.lastAlarmMessage = currentTime;
+                    value.alarmMessageCounter += 1;
+                    log.sendAlarmMail('Repeated Alarm', `Missing Event Detected: ${key}, repeated: ${value.alarmMessageCounter}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`);
+                }
+                if ((!value.alarmState) && ((value.avgDelay != 0) && (elapsedTime > (value.avgDelay * 3)))) {
+                    log.sendAlarmMail('Alarm', `Missing Event Detected: ${key}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`);
+                    value.alarmState = true;
+                    value.lastAlarmMessage = currentTime;
                 }
             });
-        }, CHECK_PERIOD * 1000);
+        }, config.dict.checkPeriod * 1000);
     }
     process(message) {
         let client = message.metadata.client;
@@ -35,6 +42,11 @@ class MissingEventProcessor extends Processor.AProcessor {
                 clientEntry.delaySum += clientEntry.delay;
                 clientEntry.avgDelay = clientEntry.delaySum / clientEntry.count;
             }
+            if (clientEntry.alarmState) {
+                log.sendAlarmMail('Release', `Event received again: ${client}`);
+                clientEntry.alarmMessageCounter = 0;
+            }
+            clientEntry.alarmState = false;
             this.clientMap.set(client, clientEntry);
             log.info(`MissingEventProcessor: Entry for ${client} updated`);
         }
@@ -46,6 +58,8 @@ class MissingEventProcessor extends Processor.AProcessor {
             clientEntry.count = -1;
             clientEntry.delaySum = 0;
             clientEntry.avgDelay = 0;
+            clientEntry.alarmState = false;
+            clientEntry.alarmMessageCounter = 0;
             this.clientMap.set(client, clientEntry);
             log.info(`MissingEventProcessor: Entry for ${client} inserted`);
         }
diff --git a/src/log.ts b/src/log.ts
index 5bf83f1..2032afe 100644
--- a/src/log.ts
+++ b/src/log.ts
@@ -26,7 +26,7 @@ export function setLevel(value: string): void {
     }
 }
 
-export function sendAlarmMail(message : string): void {
+export function sendAlarmMail(subject : string, message : string): void {
     let transport = nodemailer.createTransport({
         host: config.dict.smtpHost,
         port: config.dict.smtpPort,
@@ -39,13 +39,13 @@ export function sendAlarmMail(message : string): void {
     let mail : nodemailer.SendMailOptions = {
         from: config.dict.smtpSender,
         to: config.dict.smtpReceiver,
-        subject: "Alarm from Dispatcher",
+        subject: subject,
         text: message
     };
 
     transport.sendMail(mail)
         .then((v : nodemailer.SentMessageInfo) => {
-            info(`Alarm mail sent, ${message}, ${v.response}`)
+            info(`Mail sent, ${subject}, ${message}, ${v.response}`)
         })
         .catch((reason : any) => {
             error(`Failure when sending alarm mail: ${message}, ${reason}`)
diff --git a/src/missingeventdetector.ts b/src/missingeventdetector.ts
index 0a4e82e..43fd7c4 100644
--- a/src/missingeventdetector.ts
+++ b/src/missingeventdetector.ts
@@ -4,9 +4,6 @@ import * as Processor from './processor'
 import * as config from './config'
 
 
-const CHECK_PERIOD : number = 60  // seconds
-
-
 class ClientEntry {
     client : string
     lastEvent : number
@@ -14,6 +11,9 @@ class ClientEntry {
     count : number
     delaySum : number
     avgDelay : number
+    alarmState : boolean
+    lastAlarmMessage : number
+    alarmMessageCounter: number
 }
 
 class MissingEventProcessor extends Processor.AProcessor {
@@ -30,12 +30,18 @@ class MissingEventProcessor extends Processor.AProcessor {
                 let currentTime : number = new Date().getTime()
                 let elapsedTime : number = currentTime - value.lastEvent
                 log.info(`MissingEventProcessor: Checking ${key}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`)
-
-                if ((value.avgDelay != 0) && (elapsedTime > (value.avgDelay * 3))) {
-                    log.sendAlarmMail(`Missing Event Detected: ${key}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`)
+                if (value.alarmState && ((value.lastAlarmMessage + config.dict.alarmRepeatPeriod * 1000) < currentTime)) {
+                    value.lastAlarmMessage = currentTime                    
+                    value.alarmMessageCounter += 1
+                    log.sendAlarmMail('Repeated Alarm', `Missing Event Detected: ${key}, repeated: ${value.alarmMessageCounter}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`)
+                }
+                if ((! value.alarmState) && ((value.avgDelay != 0) && (elapsedTime > (value.avgDelay * 3)))) {
+                    log.sendAlarmMail('Alarm', `Missing Event Detected: ${key}, elapsed: ${elapsedTime / 1000}, avg. delay: ${value.avgDelay / 1000}`)
+                    value.alarmState = true
+                    value.lastAlarmMessage = currentTime                    
                 }
             })
-        }, CHECK_PERIOD * 1000)
+        }, config.dict.checkPeriod * 1000)
     }
 
     protected process(message : any) : void {
@@ -52,6 +58,11 @@ class MissingEventProcessor extends Processor.AProcessor {
                 clientEntry.delaySum += clientEntry.delay
                 clientEntry.avgDelay = clientEntry.delaySum / clientEntry.count
             }
+            if (clientEntry.alarmState) {
+                log.sendAlarmMail('Release', `Event received again: ${client}`)
+                clientEntry.alarmMessageCounter = 0
+            }
+            clientEntry.alarmState = false
             this.clientMap.set(client, clientEntry)
             log.info(`MissingEventProcessor: Entry for ${client} updated`)
         } else {
@@ -62,6 +73,8 @@ class MissingEventProcessor extends Processor.AProcessor {
             clientEntry.count = -1
             clientEntry.delaySum = 0
             clientEntry.avgDelay = 0
+            clientEntry.alarmState = false
+            clientEntry.alarmMessageCounter = 0
             this.clientMap.set(client, clientEntry)
             log.info(`MissingEventProcessor: Entry for ${client} inserted`)
         }