diff --git a/config.json b/config.json
index ccf9407..1a78e7a 100644
--- a/config.json
+++ b/config.json
@@ -1,11 +1,12 @@
 {
   "log": {
-    "level": "info",
+    "level": "debug",
     "timestamp": "DD.MM.YYYY HH:mm:ss:SS"
   },
   "watchers": [
     {
       "device": "usb-Razer_Razer_Blade_Stealth-if01-event-kbd",
+      "grep": "EV_KEY",
       "keys": [
         {
           "key": "key_enter",
diff --git a/libs/keyfilter.js b/libs/keyfilter.js
index a25569a..b770486 100644
--- a/libs/keyfilter.js
+++ b/libs/keyfilter.js
@@ -14,6 +14,7 @@ class Keyfilter {
         }
         this.actions = new Map();
         for (var index = 0; index < config.length; index++) {
+            var grep = config[index].grep;
             var type = ACTION_KEYDOWN;
             switch (config[index].type.toLowerCase()) {
                 case ACTION_KEYUP.action:
@@ -26,7 +27,7 @@ class Keyfilter {
             var command = config[index].command;
             var args = config[index].args;
             var delay = config[index].delay;
-            this.actions.set(config[index].key.toUpperCase(), { type, command, args, delay });
+            this.actions.set(config[index].key.toUpperCase(), { grep, type, command, args, delay });
         }
     }
     filterActive(input) {
diff --git a/libs/watcher.js b/libs/watcher.js
index 48e7a00..7921abf 100644
--- a/libs/watcher.js
+++ b/libs/watcher.js
@@ -16,6 +16,7 @@ class Watcher {
             this[key] = config[key];
         }
         this.keyfilter = new Keyfilter(config.keys);
+        this.grep = config.grep;
         this.callback = callback;
     }
     start() {
@@ -23,7 +24,11 @@ class Watcher {
             return;
         }
         logger.debug('starting watcher \'' + this.device + '\'...');
-        this.process = spawn("evtest", [this.device, "|", "grep", "EV_KEY"]);
+        var args = [this.device];
+        if (this.grep) {
+            args.push('|', 'grep', this.grep);
+        }
+        this.process = spawn("evtest", args);
         this.attachListeners();
         logger.info('watcher \'' + this.device + '\' initialized and capturing configured events');
     }
diff --git a/libs/watchers.js b/libs/watchers.js
index bf5ab92..166c869 100644
--- a/libs/watchers.js
+++ b/libs/watchers.js
@@ -3,62 +3,66 @@ const Watcher = require('./watcher.js');
 
 const watchers = [];
 
-function initialize() {
-    return new Promise(function (resolve, reject) {
-        if (global.config == undefined) {
-            reject('could not initialize watchers, no config defined');
+async function initialize() {
+    if (global.config == undefined) {
+        throw new Error('could not initialize watchers, no config defined');
+    }
+    if (global.config.watchers == undefined || global.config.watchers.length == 0) {
+        throw new Error('no watchers in config \'' + global.config.path + '\' defined');
+    }
+    for (var index = 0; index < global.config.watchers.length; index++) {
+        var watcher = new Watcher(global.config.watchers[index], watcherCallback);
+        try {
+            await watcher.check();
+            watchers.push(watcher)
+            logger.debug('added watcher \'' + watcher.device + '\' to internal map');
+        } catch(err) {
+            logger.error(err);
         }
-        if (global.config.watchers == undefined || global.config.watchers.length == 0) {
-            reject('no watchers in config \'' + global.config.path + '\' defined');
-        }
-        var tmp = []
-        for (var index = 0; index < global.config.watchers.length; index++) {
-            tmp.push(new Watcher(global.config.watchers[index], watcherCallback));
-        }
-        Promise.all(tmp.map(check))
-            .then(resolve)
-            .catch(reject);
-    });
-}
-function check(watcher) {
-    return new Promise((resolve, reject) => {
-        if (watcher == undefined) {
-            reject();
-        }
-        watcher.check()
-            .then(() => {
-                watchers.push(watcher)
-                logger.debug('added watcher \'' + watcher.device + '\' to internal map');
-            })
-            .then(resolve)
-            .catch(reject);
-    });
+    }
 }
 
-function start() {
-    return new Promise((resolve, reject) => {
-        logger.info('starting ' + watchers.length + ' watcher(s)...');
-        var promises = [];
-        for (var index = 0; index < watchers.length; index++) {
-            promises.push(watchers[index].start());
+async function start() {
+    logger.info('starting ' + watchers.length + ' watcher(s)...');
+    for (var index = 0; index < watchers.length; index++) {
+        try {
+            await watchers[index].start();
+        } catch (err) {
+            logger.error(err);
         }
-        Promise.all(promises)
-            .then(resolve)
-            .catch(reject);
-    });
+    }
+
+    // return new Promise((resolve, reject) => {
+    //     logger.info('starting ' + watchers.length + ' watcher(s)...');
+    //     var promises = [];
+    //     for (var index = 0; index < watchers.length; index++) {
+    //         promises.push(watchers[index].start());
+    //     }
+    //     Promise.all(promises)
+    //         .then(resolve)
+    //         .catch(reject);
+    // });
 }
 
-function stop() {
-    return new Promise((resolve, reject) => {
-        logger.info('stopping ' + watchers.length + ' watcher(s)...');
-        var promises = [];
-        for (var index = 0; index < watchers.length; index++) {
-            promises.push(watchers[index].stop());
+async function stop() {
+    logger.info('stopping ' + watchers.length + ' watcher(s)...');
+    for (var index = 0; index < watchers.length; index++) {
+        try {
+            await watchers[index].stop();
+        } catch (err) {
+            logger.error(err);
         }
-        Promise.all(promises)
-            .then(resolve)
-            .catch(reject);
-    });
+    }
+
+    // return new Promise((resolve, reject) => {
+    //     var promises = [];
+    //     for (var index = 0; index < watchers.length; index++) {
+    //         promises.push(watchers[index].stop());
+    //     }
+    //     Promise.all(promises)
+    //         .then(resolve)
+    //         .catch(reject);
+    // });
 }
 
 function watcherCallback(watcher) {