diff --git a/utils/lib.js b/utils/lib.js
index 9c82b7c..5e3aef9 100644
--- a/utils/lib.js
+++ b/utils/lib.js
@@ -1,6 +1,5 @@
-console.loggerName = 'js.lib';
-console.log('Load lib module');
-
+const log = Java.type('org.slf4j.LoggerFactory').getLogger('js.lib');
+log.info('Load lib module');
 
 function compare(a, b, operator) {
     // Hint: a = currentState, b = targetState
@@ -28,7 +27,7 @@ function compare(a, b, operator) {
                 returnValue = a.greaterThanOrEqual(b);
                 break;
             default:
-                console.error(`${operator} is no valid operator`);
+                log.error(`${operator} is no valid operator`);
                 return;
         }
     } catch(e) {
@@ -55,12 +54,12 @@ function compare(a, b, operator) {
         }        
     }
 
-    console.debug(logMsg);
+    log.debug(logMsg);
     return returnValue;
 }
 
 function convertValue(value) {
-    console.debug('Converting value ' + value + ' of type ' + typeof value);
+    log.debug('Converting value ' + value + ' of type ' + typeof value);
     if(typeof value === 'string') {
         if(value.includes(' ')) {
             let logMsg = '';
@@ -72,26 +71,26 @@ function convertValue(value) {
                 logMsg = 'Not a Quantity but has a space, leaving as a string: ' + value;
                 returnValue = value;
             } finally {
-                console.debug(logMsg);
+                log.debug(logMsg);
                 return returnValue;
             }
         } else if(!isNaN(value)) {
-            console.debug('Number: ' + value)
+            log.debug('Number: ' + value)
             return Number.parseFloat(value);
         } else if(value == 'UnDefType' || value == 'NULL' || value == 'UNDEF') {
-            console.debug('UnDefType: ' + value);
+            log.debug('UnDefType: ' + value);
             return 'UnDefType';
         }
-        console.debug('String: ' + value);
+        log.debug('String: ' + value);
         return value;
     } else if(value instanceof DecimalType || value instanceof PercentType) {
-        console.debug('DecimalType or PercentType: ' + value);
+        log.debug('DecimalType or PercentType: ' + value);
         return value.floatValue();
     } else if(value instanceof QuantityType) {
-        console.debug('QuantityType: ' + value);
+        log.debug('QuantityType: ' + value);
         return Quantity(value);
     } else {
-        console.debug('String: ' + value);
+        log.debug('String: ' + value);
         return value.toString();
     }
 }
@@ -120,7 +119,7 @@ function distanceFrom(locationA, locationB) {
     // calculate the result
     let result = `${(c * r).toFixed()} m`
     
-    console.debug(`Calculated distance between ${locationA} and ${locationB} is ${result}`);
+    log.debug(`Calculated distance between ${locationA} and ${locationB} is ${result}`);
     return result;
 }