diff --git a/package.json b/package.json
index 9cc1a91..90f3dd5 100644
--- a/package.json
+++ b/package.json
@@ -18,15 +18,17 @@
       "location"
     ],
     "watchapp": {
-      "watchface": false
+      "watchface": false,
+      "hiddenApp": false,
+      "onlyShownOnCommunication": false
     },
     "messageKeys": [
+      "READY",
       "SEARCH",
       "SUCCESS",
       "DISTANCE",
       "TIME",
-      "STEPS",
-      "STEPS_DISTANCES"
+      "INSTRUCTIONS[20]"
     ],
     "resources": {
       "media": [
@@ -77,6 +79,24 @@
           "name": "ICON_WALK_WHITE",
           "targetPlatforms": null,
           "type": "bitmap"
+        },
+        {
+          "file": "images/error_network.png",
+          "name": "ICON_ERROR_NETWORK",
+          "targetPlatforms": null,
+          "type": "bitmap"
+        },
+        {
+          "file": "images/error_api.png",
+          "name": "ICON_ERROR_API",
+          "targetPlatforms": null,
+          "type": "bitmap"
+        },
+        {
+          "file": "images/error_other.png",
+          "name": "ICON_ERROR_OTHER",
+          "targetPlatforms": null,
+          "type": "bitmap"
         }
       ]
     }
diff --git a/resources/images/error_api.png b/resources/images/error_api.png
new file mode 100644
index 0000000..e74681e
Binary files /dev/null and b/resources/images/error_api.png differ
diff --git a/resources/images/error_network.png b/resources/images/error_network.png
new file mode 100644
index 0000000..f4012ee
Binary files /dev/null and b/resources/images/error_network.png differ
diff --git a/resources/images/error_other.png b/resources/images/error_other.png
new file mode 100644
index 0000000..29d054e
Binary files /dev/null and b/resources/images/error_other.png differ
diff --git a/src/colors.h b/src/colors.h
index d42ca98..fbd0204 100644
--- a/src/colors.h
+++ b/src/colors.h
@@ -4,3 +4,5 @@
 #define COLOR_BIKE GColorTiffanyBlue
 #define COLOR_TRAIN GColorSunsetOrange
 #define COLOR_WALK GColorChromeYellow
+
+#define COLOR_ERROR GColorLightGray
diff --git a/src/directions_window.c b/src/directions_window.c
index de30092..eafa55e 100644
--- a/src/directions_window.c
+++ b/src/directions_window.c
@@ -1,11 +1,11 @@
-#include <pebble.h>
-#include "colors.h"
-#include "directions_window.h"
-
 #include <pebble.h>
 #include "colors.h"
 #include "select_window.h"
 #include "directions_window.h"
+#include "error_window.h"
+
+#define MAX_STEP_COUNT 20
+#define MAX_STEP_CHARS 128
 
 // The main window
 static Window *window;
@@ -17,6 +17,18 @@ static GColor selected_type_color;
 static DictationSession *dictation_session;
 static char *address;
 
+// TODO: implement a timer, that kills the proccess if the message is never send (needed?)
+static bool AppMessageIsReady;
+static bool AppMessageSendOnCallback;
+static int RouteDataDistance;
+static int RouteDataTime;
+static char RouteDataSteps[MAX_STEP_COUNT][MAX_STEP_CHARS];
+static int RouteDataStepsCount;
+
+// Function declarations
+static void app_message_send_search_data();
+void window_display_error(enum ErrorType err);
+
 
 // ******************************
 // * DIRECTON LIST (MENU LAYER) *
@@ -51,6 +63,7 @@ static void draw_row_callback(GContext *ctx, const Layer *cell_layer, MenuIndex
   }
 }
 
+// FIXME: Will probably not be necessary later!
 static void selection_will_change_callback(struct MenuLayer *menu_layer, MenuIndex *new_index, MenuIndex old_index, void *context) {
   // Change the highlight color
   #ifdef PBL_COLOR
@@ -62,7 +75,6 @@ static void selection_will_change_callback(struct MenuLayer *menu_layer, MenuInd
       // All other cells
       default:
         menu_layer_set_highlight_colors(directions_list, GColorWhite, selected_type_color);
-        break;
     }
   #endif
 }
@@ -77,22 +89,150 @@ static void dictation_session_callback(DictationSession *session, DictationSessi
   if (status == DictationSessionStatusSuccess) {
     // Store the address and load a route
     address = transcript;
-    // TODO load route data
+    // Send the search data
+    app_message_send_search_data();
   } else {
-    // TODO display proper error window
+    // Dictation failed, remove this window
     window_stack_remove(window, true);
   }
 }
 
 
-// ******************
-// * APP SYNC STUFF *
-// ******************
+// *********************
+// * APP MESSAGE STUFF *
+// *********************
+
+// Accept data from the watch
+static void app_message_inbox_recived_callback(DictionaryIterator *iter, void *context) {
+  // Test all possible message types
+  Tuple *message;
+
+  // Test if the recived message is for key READY
+  message = dict_find(iter, MESSAGE_KEY_READY);
+  if (message) {
+    // Set status to ready
+    AppMessageIsReady = (bool)message->value->int16;
+    // Send pending search data
+    if (AppMessageSendOnCallback) {
+      app_message_send_search_data();
+    }
+  }
+
+  // Test if the recived message is for key SUCCESS
+  message = dict_find(iter, MESSAGE_KEY_SUCCESS);
+  if (message) {
+    // Respond with the correct UI
+    switch ((int)message->value->int32) {
+      // Success
+      case 0:
+        // TODO: update the ui in some way
+        window_display_error(Other);
+        break;
+      // Route not found / api error
+      case 1:
+        window_display_error(Api);
+        break;
+      // Too many steps (== route not found error)
+      case 2:
+        window_display_error(Api);
+        break;
+      default:
+        window_display_error(Other);
+    }
+  }
+
+  // Test if the recived message is for key DISTANCE
+  message = dict_find(iter, MESSAGE_KEY_DISTANCE);
+  if (message) {
+    RouteDataDistance = (int)message->value->int32;
+  }
+
+  // Test if the recived message is for key TIME
+  message = dict_find(iter, MESSAGE_KEY_TIME);
+  if (message) {
+    RouteDataTime = (int)message->value->int32;
+  }
+
+  // Test if the recived message is for key INSTRUCTIONS
+  for (int i = 0; i < MAX_STEP_COUNT; i++) {
+    message = dict_find(iter, MESSAGE_KEY_INSTRUCTIONS + i);
+    if (message) {
+      // Copy the string into the string array
+      static char *empty;
+      strncat(empty, message->value->cstring, MAX_STEP_CHARS);
+      strcpy(RouteDataSteps[i], empty);
+      // Store the new length of the RouteDataSteps
+      RouteDataStepsCount = i + 1;
+    }
+  }
+}
+
+// Respond with error, if any data is lost
+static void app_message_inbox_dropped_callback(AppMessageResult reason, void *context) {
+  // Display the network error
+  window_display_error(Network);
+}
+
+// Respond with error, if data can not be send to watch
+static void app_message_outbox_failed_callback(DictionaryIterator *iter, AppMessageResult reason, void *context) {
+  // Display the network error
+  window_display_error(Network);
+}
+
+// Send the search data to the phone
+static void app_message_send_search_data() {
+  // Send the data to the phone if conn is ready
+  if (AppMessageIsReady) {
+    // Create a string with the correct length
+    char message[sizeof(address) + 1];
+    // Add the type as the first char
+    message[0] = '0' + selected_type_enum;
+    // Add the address
+    strcat(message, address);
+    // Make sure the string is terminated correctely, just in case
+    message[sizeof(message) - 1] = '\n';
+
+    // Write string to bluetooth storage
+    DictionaryIterator *iter;
+    if (app_message_outbox_begin(&iter) == APP_MSG_OK) {
+      dict_write_cstring(iter, MESSAGE_KEY_SEARCH, message);
+      // Send the outbox
+      app_message_outbox_send();
+    } else {
+      // Display network error
+      window_display_error(Network);
+    }
+  } else {
+    AppMessageSendOnCallback = true;
+  }
+}
+
+// Set up the whole app message thing (once the address is worked out)
+static void app_message_start() {
+  // Set initial values
+  AppMessageIsReady = true;
+  AppMessageSendOnCallback = false;
+  // Register all callbacks
+  app_message_register_inbox_received(app_message_inbox_recived_callback);
+  app_message_register_inbox_dropped(app_message_inbox_dropped_callback);
+  app_message_register_outbox_failed(app_message_outbox_failed_callback);
+  // Open the app-message
+  app_message_open(APP_MESSAGE_INBOX_SIZE_MINIMUM, APP_MESSAGE_OUTBOX_SIZE_MINIMUM);
+}
+
 
 // ********************
 // * WINDOW LIFECYCLE *
 // ********************
 
+// Network error callback
+void window_display_error(enum ErrorType err) {
+  // Show the error window
+  error_window_push(err);
+  // Remove this window from the window stack
+  window_stack_remove(window, false);
+}
+
 // Window unload handler
 static void window_unload() {
   // Destroy the menu layer
@@ -101,6 +241,9 @@ static void window_unload() {
   // Destroy the dictation session
   dictation_session_destroy(dictation_session);
 
+  // Remove all app message callbacks
+  app_message_deregister_callbacks();
+
   // Destroy the window
   window_destroy(window);
   window = NULL;
@@ -175,4 +318,9 @@ void directions_window_push() {
   // Start the dictation session TODO: Change this, once app sync stuff is working
   // dictation_session_start(dictation_session);
   address = "Meerbusch Brockhofweg 9"; // WIP address string
+
+  // Open the connection to the phone
+  app_message_start();
+  // TODO: Remove this for final version; this is a playeholder implementation (skipping the dictation)
+  app_message_send_search_data();
 }
diff --git a/src/error_window.c b/src/error_window.c
new file mode 100644
index 0000000..6fd1ca7
--- /dev/null
+++ b/src/error_window.c
@@ -0,0 +1,112 @@
+#include <pebble.h>
+#include "colors.h"
+#include "error_window.h"
+
+// The main window
+static Window *window;
+static BitmapLayer *error_icon_layer;
+static TextLayer *error_text_layer;
+
+// The error to be displayed
+int display_error_type;
+
+// Error icon / text
+static GBitmap *icon_error;
+static char *text_error;
+
+
+static void window_unload() {
+  // Destroy the text layer & the error icon layer
+  bitmap_layer_destroy(error_icon_layer);
+  text_layer_destroy(error_text_layer);
+
+  // Destroy the image resource
+  gbitmap_destroy(icon_error);
+
+  // Destroy the window
+  window_destroy(window);
+  window = NULL;
+}
+
+static void window_load() {
+  // Get the root layer
+  Layer *window_layer = window_get_root_layer(window);
+  GRect bounds = layer_get_bounds(window_layer);
+
+  switch(display_error_type) {
+    // Network
+    case 0:
+      icon_error = gbitmap_create_with_resource(RESOURCE_ID_ICON_ERROR_NETWORK);
+      text_error = "Could not reach phone";
+      break;
+    // Api
+    case 1:
+      icon_error = gbitmap_create_with_resource(RESOURCE_ID_ICON_ERROR_API);
+      text_error = "No route could be found";
+      break;
+    // Other / Undefined
+    case 2:
+      icon_error = gbitmap_create_with_resource(RESOURCE_ID_ICON_ERROR_OTHER);
+      text_error = "Something went wrong";
+      break;
+  }
+
+  // Set up the error image layer GRect(x, y, w, h)
+  #ifdef PBL_ROUND
+    // Round spacing / Align
+    error_icon_layer = bitmap_layer_create(GRect(0, 0, bounds.size.w, 110));
+    bitmap_layer_set_alignment(error_icon_layer, GAlignBottom);
+  #else
+    // Square spacing / Align
+    error_icon_layer = bitmap_layer_create(GRect(0, 0, bounds.size.w, 100));
+    bitmap_layer_set_alignment(error_icon_layer, GAlignCenter);
+  #endif
+  bitmap_layer_set_bitmap(error_icon_layer, icon_error);
+  bitmap_layer_set_compositing_mode(error_icon_layer, GCompOpSet);
+  #ifdef PBL_COLOR
+    // Color only
+    bitmap_layer_set_background_color(error_icon_layer, COLOR_ERROR);
+  #endif
+
+  layer_add_child(window_layer, (Layer *)error_icon_layer);
+
+  // Set up the error text
+  #ifdef PBL_ROUND
+    // Round spacing
+    error_text_layer = text_layer_create(GRect(0, 110, bounds.size.w, bounds.size.h - 110));
+  #else
+    // Square spacing
+    error_text_layer = text_layer_create(GRect(0, 100, bounds.size.w, bounds.size.h - 100));
+  #endif
+  text_layer_set_text(error_text_layer, text_error);
+  text_layer_set_font(error_text_layer, fonts_get_system_font(FONT_KEY_GOTHIC_24_BOLD));
+  text_layer_set_text_alignment(error_text_layer, GTextAlignmentCenter);
+  text_layer_set_text_color(error_text_layer, GColorBlack);
+  #ifdef PBL_COLOR
+    // Color only
+    text_layer_set_background_color(error_text_layer, COLOR_ERROR);
+  #endif
+
+  layer_add_child(window_layer, (Layer *)error_text_layer);
+  #ifdef PBL_ROUND
+    // Round text insets
+    text_layer_enable_screen_text_flow_and_paging(error_text_layer, 0);
+  #endif
+}
+
+void error_window_push(enum ErrorType error_type) {
+  display_error_type = error_type;
+  if (!window) {
+    // Create the window
+    window = window_create();
+
+    // Set up the window handlers
+    window_set_window_handlers(window, (WindowHandlers) {
+      .load = window_load,
+      .unload = window_unload,
+    });
+  }
+
+  // Display the window
+  window_stack_push(window, true);
+}
diff --git a/src/error_window.h b/src/error_window.h
new file mode 100644
index 0000000..2cd1c43
--- /dev/null
+++ b/src/error_window.h
@@ -0,0 +1,13 @@
+#pragma once
+#include <pebble.h>
+
+enum ErrorType {
+  // Problem connection to phone
+  Network = 0,
+  // Error response from api
+  Api = 1,
+  // Something simply went wrong
+  Other = 2
+};
+
+void error_window_push(enum ErrorType);
diff --git a/src/js/app.js b/src/js/app.js
index 51a2531..54556c2 100644
--- a/src/js/app.js
+++ b/src/js/app.js
@@ -1,33 +1,123 @@
+/**
+* SETUP OVERVIEW
+*
+* About the send messages
+* –––
+* (1) Overview data is send (distance, time needed)
+* (2) Step data array is send (each step string, max 20 entrys) -> THE LAST SEND INDEX IS THE LENGTH!
+* (3) Success value is send (terminates the transmittion; it's true/false
+*   value determines whether the transmition was successfull or not (E.g.
+*   if false is send as the success first, no route was found)
+*
+* About the success codes:
+* –––
+* 0 = Success; 1 = Route not found; 2 = Too many steps; ...
+*
+* About the recived message:
+* –––
+* Field: SEARCH
+* Contents: {selected_type}{address} (e.g. 0Brockhofweg 9)
+*   The first character is always the type selected, the rest
+*   is the written address.
+* {selected_type} vals: 0 = Car; 1 = Bike; 2 = Train; 3 = Walk;
+*/
+
+
 // Data keys
 var keys = require('message_keys');
+var maxStepCount = 20;
 
-// Common functions
-function createData(success, distance, time, steps, stepsDistances) {
+
+// App Message functions
+function sendSuccess(code) {
+  // Build message
+  var key = keys.SUCCESS;
   var dict = {};
-  dict[keys.SUCCESS] = success;
-  dict[keys.DISTANCE] = distance;
-  dict[keys.TIME] = time;
-  dict[keys.STEPS] = steps;
-  dict[keys.STEPS_DISTANCES] = stepsDistances;
-  return dict;
+  dict[key] = +code;
+
+  // Send message to pebble
+  Pebble.sendAppMessage(dict, function() {
+    // Success!
+    console.log('Transmission completed');
+  }, function() {
+    // Error
+    console.log('Transmission failed at [SUCCESS MESSAGE]');
+  });
 }
 
-// Some dummy data (let's make the c app work first ;)
+function sendStepItem(stepList, index) {
+  // Build message
+  var key = keys.INSTRUCTIONS + index;
+  var dict = {};
+  dict[key] = stepList[index];
+
+  // Send message to pebble
+  Pebble.sendAppMessage(dict, function() {
+    // Success, send next item
+    index ++;
+    if (index < stepList.length && index < maxStepCount) {
+      // Recursive callbacks, hell yeah!
+      sendStepItem(stepList, index);
+    } else {
+      // We are finished
+      sendSuccess(0);
+    }
+  }, function() {
+    // Error
+    console.log('Transmission failed at index '.concat(index));
+  });
+}
+
+function sendRoute(success, distance, time, stepList) {
+  // Send message to pebble if a route was found
+  if (success) {
+    // Build message
+    var keyDistance = keys.DISTANCE;
+    var keyTime = keys.TIME;
+    dict[keyDistance] = +distance;
+    dict[keyTime] = +time;
+
+    // Transmit
+    Pebble.sendAppMessage(dict, function() {
+      // Success!
+      sendStepItem(stepList, 0);
+    }, function() {
+      // Error
+      console.log('Transmission failed at [OVERVIEW]');
+    });
+  } else {
+    // Send error message (route not found)
+    sendSuccess(1);
+  }
+}
+
+// Api data functions FIXME: Acutally use api
+function fetchAndSendRoute(routeType, destination) {
+  // TODO: Add api data here (+ use geolocation etc)
+  console.log(routeType);
+  console.log(destination);
+  /* dummy data: */
+  sendRoute(true, 560, 16, ['This is the first step', 'This is the second step', 'This is the third step', 'This is the final step']);
+}
+
+// Accept data from the pebble watch
 Pebble.addEventListener('appmessage', function(e) {
   // Get the dictionary from the message
   var dict = e.payload;
-  console.log(dict.SEARCH);
 
-  var message = createData(
-    true,
-    140,
-    13,
-    ["Do sometoing", "Step 3", "the very last step"],
-    [11, 0, 5321]
-  );
-  Pebble.sendAppMessage(message, function() {
-    console.log('Message sent successfully: ' + JSON.stringify(message));
-  }, function(e) {
-    console.log('Message failed: ' + JSON.stringify(message));
-  });
+  // Does the SEARCH field exist?
+  if (dict['SEARCH']) {
+    fetchAndSendRoute(dict['SEARCH'].substr(0, 1), dict['SEARCH'].substr(1));
+  }
+});
+
+// Ready event
+Pebble.addEventListener('ready', function() {
+  // Tell the watch that the js part is ready
+  var key = keys.READY;
+  var dict = {};
+  dict[key] = true;
+  Pebble.sendAppMessage(dict);
+
+  console.log('Js part is ready!');
 });
diff --git a/src/select_window.c b/src/select_window.c
index 2270fa5..0b211b5 100644
--- a/src/select_window.c
+++ b/src/select_window.c
@@ -27,7 +27,7 @@ static uint16_t get_num_rows_callback(struct MenuLayer *menu_layer, uint16_t sec
 
 static int16_t get_cell_height_callback(struct MenuLayer *menu_layer, MenuIndex *cell_index, void *context) {
   // This part is for round watches only
-  #if defined(PBL_ROUND)
+  #ifdef PBL_ROUND
     // Round
     bool selected = menu_layer_is_index_selected(menu_layer, cell_index);
     if (selected) {