diff --git a/src/main/java/de/hottis/mbusMaster/MbusMaster.java b/src/main/java/de/hottis/mbusMaster/MbusMaster.java
index 99af8b4..6a531b5 100644
--- a/src/main/java/de/hottis/mbusMaster/MbusMaster.java
+++ b/src/main/java/de/hottis/mbusMaster/MbusMaster.java
@@ -11,7 +11,7 @@ import org.apache.logging.log4j.Logger;
 public class MbusMaster {
 	static final String PROPS_FILENAME = "mbusMaster.props";
 	static final Logger logger = LogManager.getRootLogger();
-	
+	static boolean stopSignal = false;
 	
 	public static void main(String[] args) throws Exception {
 		logger.info("MbusMaster starting");
@@ -24,23 +24,43 @@ public class MbusMaster {
 		logger.debug("Configuration loaded");
 		*/
 
+		/*
+		Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+			stopSignal = true;
+    	}));
+		logger.debug("Shutdown hook added");
+		*/
+		
 		MbusgwChild mbusgw = new MbusgwChild(false);
 		mbusgw.start();
 
+		byte[] devices = { (byte)80, (byte)81, (byte)82, (byte)83, (byte)84, (byte)85, (byte)86, (byte)87 };
 
-		try {
-			mbusgw.sendRequest((byte)0x5b, (byte)80);
+		int cnt = 0;
+		while (! stopSignal) {
+			System.out.println("--- " + cnt + " ----------------------------------------------------");
+			cnt++;
+			for (byte device : devices) {
+				System.out.println("Querying device " + device);
+				try {
+					mbusgw.sendRequest((byte)0x5b, device);
 
-			byte[] frame = mbusgw.collectResponse();
-			for (byte x : frame) {
-				System.out.print(Integer.toHexString(Byte.toUnsignedInt(x)) + " ");
+					byte[] frame = mbusgw.collectResponse();
+					for (byte x : frame) {
+						System.out.print(Integer.toHexString(Byte.toUnsignedInt(x)) + " ");
+					}
+					System.out.println();
+				} catch (IOException e) {
+					logger.error("Error " + e.toString() + ", " + e.getMessage() + " in Meterbus dialog for device " + device);
+				}
 			}
-			System.out.println();
-		} catch (IOException e) {
-			logger.error("Error in Meterbus dialog: " + e.toString() + ", " + e.getMessage());
+			// if (cnt >= 10) {
+			//	break;
+			//}
+			Thread.sleep(15*1000);
 		}
 
-		System.out.println("Stopping mbusgw process");
+		logger.info("Stopping mbusgw process");
 		mbusgw.stop();
 
 	}		
diff --git a/src/main/java/de/hottis/mbusMaster/MbusgwChild.java b/src/main/java/de/hottis/mbusMaster/MbusgwChild.java
index 149d445..d916a77 100644
--- a/src/main/java/de/hottis/mbusMaster/MbusgwChild.java
+++ b/src/main/java/de/hottis/mbusMaster/MbusgwChild.java
@@ -63,9 +63,10 @@ public class MbusgwChild {
     logger.debug("stderrToLog thread started");
   }
 
-  public void stop() throws InterruptedException {
+  public void stop() throws InterruptedException, IOException {
     logger.info("About to stop mbusgw child process");
-    this.mbusgwProcess.destroy();
+    this.sendRequest((byte)0, (byte)0);
+    // this.mbusgwProcess.destroy();
     this.mbusgwProcess.waitFor();
     logger.info("Process stopped");
 
diff --git a/src/main/resources/log4j2.xml b/src/main/resources/log4j2.xml
index 1177afa..3e6281e 100644
--- a/src/main/resources/log4j2.xml
+++ b/src/main/resources/log4j2.xml
@@ -9,7 +9,7 @@
     </File>
   </Appenders>
   <Loggers>
-    <Root level="debug">
+    <Root level="error">
       <AppenderRef ref="ConsoleAppender"/>
       <AppenderRef ref="FileAppender"/>
     </Root>