diff --git a/tools/cooja/java/se/sics/cooja/dialogs/SerialUI.java b/tools/cooja/java/se/sics/cooja/dialogs/SerialUI.java
index 788e9f6f0..edc88ff5c 100644
--- a/tools/cooja/java/se/sics/cooja/dialogs/SerialUI.java
+++ b/tools/cooja/java/se/sics/cooja/dialogs/SerialUI.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * Copyright (c) 2012, Swedish Institute of Computer Science.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -44,8 +44,6 @@ import java.util.Observable;
 import java.util.Observer;
 
 import javax.swing.JButton;
-import javax.swing.JCheckBox;
-import javax.swing.JLabel;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
@@ -58,161 +56,165 @@ import org.jdom.Element;
 import se.sics.cooja.Mote;
 import se.sics.cooja.interfaces.Log;
 import se.sics.cooja.interfaces.SerialPort;
-import se.sics.cooja.plugins.SLIP;
 
 public abstract class SerialUI extends Log implements SerialPort {
   private static Logger logger = Logger.getLogger(SerialUI.class);
 
-  private final static byte SLIP_END = (byte)0300;
-  private final static byte SLIP_ESC = (byte)0333;
-  private final static byte SLIP_ESC_END = (byte)0334;
-  private final static byte SLIP_ESC_ESC = (byte)0335;
-
-
   private final static int MAX_LENGTH = 1024;
 
-  private String lastLogMessage = "";
-  private StringBuilder newMessage = new StringBuilder();
+  private byte lastSerialData = 0; /* SerialPort */
+  private String lastLogMessage = ""; /* Log */
+  private StringBuilder newMessage = new StringBuilder(); /* Log */
 
-  private JTextArea logTextPane = null;
-  private JTextField commandField;
-  private JCheckBox slipCheckbox;
-  private String[] history = new String[50];
-  private int historyPos = 0;
-  private int historyCount = 0;
+  /* Command history */
+  private final static int HISTORY_SIZE = 15;
+  private ArrayList<String> history = new ArrayList<String>();
+  private int historyPos = -1;
 
-  private class SerialDataObservable extends Observable {
-    private void notifyNewData() {
+  /* Log */
+  public String getLastLogMessage() {
+    return lastLogMessage;
+  }
+
+  /* SerialPort */
+  private abstract class SerialDataObservable extends Observable {
+    public abstract void notifyNewData();
+  }
+  private SerialDataObservable serialDataObservable = new SerialDataObservable() {
+    public void notifyNewData() {
       if (this.countObservers() == 0) {
         return;
       }
       setChanged();
       notifyObservers(SerialUI.this);
     }
-  }
-
-  private SerialDataObservable serialDataObservable = new SerialDataObservable();
-  private byte lastSerialData = 0;
-
-  public String getLastLogMessage() {
-    return lastLogMessage;
-  }
-
-  public abstract Mote getMote();
-
+  };
   public void addSerialDataObserver(Observer o) {
     serialDataObservable.addObserver(o);
   }
-
   public void deleteSerialDataObserver(Observer o) {
     serialDataObservable.deleteObserver(o);
   }
-
   public byte getLastSerialData() {
     return lastSerialData;
   }
-
-  public JPanel getInterfaceVisualizer() {
-    JPanel panel = new JPanel();
-    panel.setLayout(new BorderLayout());
-
-    if (logTextPane == null) {
-      logTextPane = new JTextArea();
+  public void dataReceived(int data) {
+    if (data == '\n') {
+      /* Notify observers of new log */
+      lastLogMessage = newMessage.toString();
+      lastLogMessage = lastLogMessage.replaceAll("[^\\p{Print}]", "");
+      newMessage.setLength(0);
+      this.setChanged();
+      this.notifyObservers(getMote());
+    } else {
+      newMessage.append((char) data);
+      if (newMessage.length() > MAX_LENGTH) {
+        /*logger.warn("Dropping too large log message (>" + MAX_LENGTH + " bytes).");*/
+        lastLogMessage = "# [1024 bytes binary data]";
+        newMessage.setLength(0);
+        this.setChanged();
+        this.notifyObservers(getMote());
+      }
     }
 
-    // Send RS232 data visualizer
-    JPanel sendPane = new JPanel(new BorderLayout());
-    commandField = new JTextField(15);
+    /* Notify observers of new serial character */
+    lastSerialData = (byte) data;
+    serialDataObservable.notifyNewData();
+  }
+
+
+  /* Mote interface visualizer */
+  public JPanel getInterfaceVisualizer() {
+    JPanel panel = new JPanel(new BorderLayout());
+    JPanel commandPane = new JPanel(new BorderLayout());
+
+    final JTextArea logTextPane = new JTextArea();
+    final JTextField commandField = new JTextField(15);
     JButton sendButton = new JButton("Send data");
-    ActionListener action = new ActionListener() {
 
+    ActionListener sendCommandAction = new ActionListener() {
       public void actionPerformed(ActionEvent e) {
-        String command = trim(commandField.getText());
-        if (command != null) {
-          try {
-            int previous = historyCount - 1;
-            if (previous < 0) {
-              previous += history.length;
-            }
-            if (!command.equals(history[previous])) {
-              history[historyCount] = command;
-              historyCount = (historyCount + 1) % history.length;
-            }
-            historyPos = historyCount;
-
-            if (slipCheckbox.isSelected()) {
-              addToLog("SLIP> " + command);
-              command += "\n";
-              writeArray(SLIP.asSlip(command.getBytes()));
-            } else {
-              addToLog("> " + command);
-              writeString(command);
-            }
-            commandField.setText("");
-          } catch (Exception ex) {
-            System.err.println("could not send '" + command + "':");
-            ex.printStackTrace();
-            JOptionPane.showMessageDialog(logTextPane,
-                "could not send '" + command + "':\n"
-                + ex, "ERROR",
-                JOptionPane.ERROR_MESSAGE);
-          }
-        } else {
+        final String command = trim(commandField.getText());
+        if (command == null) {
           commandField.getToolkit().beep();
+          return;
+        }
+
+        try {
+          /* Add to history */
+          if (history.size() > 0 && command.equals(history.get(0))) {
+            /* Ignored */
+          } else {
+            history.add(0, command);
+            while (history.size() > HISTORY_SIZE) {
+              history.remove(HISTORY_SIZE-1);
+            }
+          }
+          historyPos = -1;
+
+          appendToTextArea(logTextPane, "> " + command);
+          commandField.setText("");
+          if (getMote().getSimulation().isRunning()) {
+            getMote().getSimulation().invokeSimulationThread(new Runnable() {
+              public void run() {
+                writeString(command);
+              }
+            });
+          } else {
+            writeString(command);
+          }
+        } catch (Exception ex) {
+          System.err.println("could not send '" + command + "':");
+          ex.printStackTrace();
+          JOptionPane.showMessageDialog(
+              logTextPane,
+              "Could not send '" + command + "':\n" + ex.getMessage(), "Error sending message",
+              JOptionPane.ERROR_MESSAGE);
         }
       }
-
     };
+    commandField.addActionListener(sendCommandAction);
+    sendButton.addActionListener(sendCommandAction);
+
+    /* History */
     commandField.addKeyListener(new KeyAdapter() {
-      @Override
       public void keyPressed(KeyEvent e) {
         switch (e.getKeyCode()) {
         case KeyEvent.VK_UP: {
-          int nextPos = (historyPos + history.length - 1) % history.length;
-          if (nextPos == historyCount || history[nextPos] == null) {
+          historyPos++;
+          if (historyPos >= history.size()) {
+            historyPos = history.size() - 1;
             commandField.getToolkit().beep();
+          }
+          if (historyPos >= 0 && historyPos < history.size()) {
+            commandField.setText(history.get(historyPos));
           } else {
-            String cmd = trim(commandField.getText());
-            if (cmd != null) {
-              history[historyPos] = cmd;
-            }
-            historyPos = nextPos;
-            commandField.setText(history[historyPos]);
+            commandField.setText("");
           }
           break;
         }
         case KeyEvent.VK_DOWN: {
-          int nextPos = (historyPos + 1) % history.length;
-          if (nextPos == historyCount) {
-            historyPos = nextPos;
+          historyPos--;
+          if (historyPos < 0) {
+            historyPos = -1;
             commandField.setText("");
-          } else if (historyPos == historyCount || history[nextPos] == null) {
             commandField.getToolkit().beep();
+            break;
+          }
+          if (historyPos >= 0 && historyPos < history.size()) {
+            commandField.setText(history.get(historyPos));
           } else {
-            String cmd = trim(commandField.getText());
-            if (cmd != null) {
-              history[historyPos] = cmd;
-            }
-            historyPos = nextPos;
-            commandField.setText(history[historyPos]);
+            commandField.setText("");
           }
           break;
         }
         }
       }
-
     });
 
-    slipCheckbox = new JCheckBox("", false);
-    slipCheckbox.setToolTipText("Wrap data as SLIP");
+    commandPane.add(BorderLayout.CENTER, commandField);
+    commandPane.add(BorderLayout.EAST, sendButton);
 
-    commandField.addActionListener(action);
-    sendButton.addActionListener(action);
-    sendPane.add(BorderLayout.WEST, slipCheckbox);
-    sendPane.add(BorderLayout.CENTER, commandField);
-    sendPane.add(BorderLayout.EAST, sendButton);
-
-    // Receive RS232 data visualizer
     logTextPane.setOpaque(false);
     logTextPane.setEditable(false);
     logTextPane.addKeyListener(new KeyAdapter() {
@@ -223,52 +225,28 @@ public abstract class SerialUI extends Log implements SerialPort {
         commandField.requestFocusInWindow();
       }
     });
-    if (getLastLogMessage() == null) {
-      logTextPane.setText("");
-    } else {
-      logTextPane.append(getLastLogMessage());
-    }
 
+    /* Mote interface observer */
     Observer observer;
     this.addObserver(observer = new Observer() {
       public void update(Observable obs, Object obj) {
         final String logMessage = getLastLogMessage();
         EventQueue.invokeLater(new Runnable() {
           public void run() {
-            addToLog(logMessage);
+            appendToTextArea(logTextPane, logMessage);
           }
         });
       }
     });
-
-    // Saving observer reference for releaseInterfaceVisualizer
     panel.putClientProperty("intf_obs", observer);
 
     JScrollPane scrollPane = new JScrollPane(logTextPane);
     scrollPane.setPreferredSize(new Dimension(100, 100));
-    panel.add(BorderLayout.NORTH, new JLabel("Last serial data:"));
     panel.add(BorderLayout.CENTER, scrollPane);
-    panel.add(BorderLayout.SOUTH, sendPane);
+    panel.add(BorderLayout.SOUTH, commandPane);
     return panel;
   }
 
-  protected void addToLog(String text) {
-    String current = logTextPane.getText();
-    int len = current.length();
-    if (len > 8192) {
-      current = current.substring(len - 8192);
-    }
-    current = len > 0 ? (current + '\n' + text) : text;
-    logTextPane.setText(current);
-    logTextPane.setCaretPosition(current.length());
-
-    Rectangle visRect = logTextPane.getVisibleRect();
-    if (visRect.x > 0) {
-      visRect.x = 0;
-      logTextPane.scrollRectToVisible(visRect);
-    }
-  }
-
   public void releaseInterfaceVisualizer(JPanel panel) {
     Observer observer = (Observer) panel.getClientProperty("intf_obs");
     if (observer == null) {
@@ -279,13 +257,14 @@ public abstract class SerialUI extends Log implements SerialPort {
     this.deleteObserver(observer);
   }
 
+  private static final String HISTORY_SEPARATOR = "~;";
   public Collection<Element> getConfigXML() {
     StringBuilder sb = new StringBuilder();
     for (String s: history) {
       if (s == null) {
         continue;
       }
-      sb.append(s + "~;");
+      sb.append(s + HISTORY_SEPARATOR);
     }
     if (sb.length() == 0) {
       return null;
@@ -302,101 +281,42 @@ public abstract class SerialUI extends Log implements SerialPort {
   public void setConfigXML(Collection<Element> configXML, boolean visAvailable) {
     for (Element element : configXML) {
       if (element.getName().equals("history")) {
-        String[] history = element.getText().split("~;");
-        System.arraycopy(history, 0, this.history, 0, history.length);
-        historyCount = history.length;
-        historyPos = historyCount;
+        String[] history = element.getText().split(HISTORY_SEPARATOR);
+        for (String h: history) {
+          this.history.add(h);
+        }
+        historyPos = -1;
       }
     }
   }
 
-  private int tosChars = 0;
-  boolean tosMode = false;
-  private int tosPos = 0;
-  private int tosLen = 0;
-
-  private int slipCounter = 0;
-  private int totalTOSChars = 0;
-
-  public void dataReceived(int data) {
-    if (data == SLIP_END || data == SLIP_ESC) {
-      slipCounter++;
-    }
-    if (tosMode) {
-      int tmpData = data;
-      /* needs to add checks to CRC */
-      //    System.out.println("Received: " + Integer.toString(data, 16) + " = " + (char) data + "  tosPos: " + tosPos);
-      if (data == 0x7e) {
-        if (tosPos > 6) {
-          lastLogMessage = "TinyOS: " + newMessage.toString();
-          newMessage.setLength(0);
-          this.setChanged();
-          this.notifyObservers(getMote());
-          // System.out.println("*** Printing TOS String: " + lastLogMessage);
-          tosPos = 0;
-          tosLen = 0;
-        } else {
-          /* start of new message! */
-          tosPos = 0;
-          tosLen = 0;
-        }
-      }
-      if (tosPos == 7) {
-        tosLen = data;
-        // System.out.println("TOS Payload len: " + tosLen);
-      }
-      if (tosPos > 9 && tosPos < 10 + tosLen) {
-        if (data < 32) {
-          tmpData = 32;
-        }
-        newMessage.append((char) tmpData);
-      }
-    } else {
-      if (data == 0x7e) {
-        tosChars++;
-        totalTOSChars = 0; /* XXX Disabled TOS mode due to error */
-        totalTOSChars++;
-        if (tosChars == 2) {
-          if (totalTOSChars > slipCounter) {
-            tosMode = true;
-            tosMode = false; /* XXX Disabled TOS mode due to error */
-            /* already read one char here */
-            tosPos = 1;
-          } else {
-            tosChars = 0;
-          }
-        }
-      } else {
-        tosChars = 0;
-      }
-      if (data == '\n') {
-        lastLogMessage = newMessage.toString();
-        lastLogMessage = lastLogMessage.replaceAll("[^\\p{Print}]", ""); 
-        newMessage.setLength(0);
-        this.setChanged();
-        this.notifyObservers(getMote());
-      } else {
-        newMessage.append((char) data);
-        if (newMessage.length() > MAX_LENGTH) {
-          /*logger.warn("Dropping too large log message (>" + MAX_LENGTH + " bytes).");*/
-          lastLogMessage = "# [1024 bytes binary data]";
-          this.setChanged();
-          this.notifyObservers(getMote());
-          newMessage.setLength(0);
-        }
-      }
-    }
-    lastSerialData = (byte) data;
-    serialDataObservable.notifyNewData();
-  }
-
   public void close() {
   }
 
   public void flushInput() {
   }
 
-  private String trim(String text) {
+  public abstract Mote getMote();
+
+
+  protected static void appendToTextArea(JTextArea textArea, String text) {
+    String current = textArea.getText();
+    int len = current.length();
+    if (len > 8192) {
+      current = current.substring(len - 8192);
+    }
+    current = len > 0 ? (current + '\n' + text) : text;
+    textArea.setText(current);
+    textArea.setCaretPosition(current.length());
+
+    Rectangle visRect = textArea.getVisibleRect();
+    if (visRect.x > 0) {
+      visRect.x = 0;
+      textArea.scrollRectToVisible(visRect);
+    }
+  }
+
+  private static String trim(String text) {
     return (text != null) && ((text = text.trim()).length() > 0) ? text : null;
   }
 }