diff --git a/config.xml b/config.xml
index 24de9b1..d046dc4 100644
--- a/config.xml
+++ b/config.xml
@@ -83,6 +83,7 @@
     <plugin name="cordova-plugin-ionic-webview" spec="^2.0.0" />
     <plugin name="cordova-plugin-ionic-keyboard" spec="^2.0.5" />
     <plugin name="wifiwizard2" spec="~3.1.0" />
+    <plugin name="cordova-plugin-network-information" spec="2.0.1" />
     <engine name="android" spec="7.1.1" />
     <engine name="browser" spec="5.0.4" />
 </widget>
diff --git a/package-lock.json b/package-lock.json
index a9cc126..29be2df 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -96,6 +96,11 @@
       "resolved": "https://registry.npmjs.org/@ionic-native/core/-/core-4.15.0.tgz",
       "integrity": "sha512-WlFcBktHnufiu+SB1u2GemEkDrXE94+LUkg59BQL1Tr0j+7EXcNY20JUUFCnQZP+uTJbUxaYZEa36B8UKBBpbA=="
     },
+    "@ionic-native/network": {
+      "version": "4.17.0",
+      "resolved": "https://registry.npmjs.org/@ionic-native/network/-/network-4.17.0.tgz",
+      "integrity": "sha512-isAZx0CWIGHxl4u7GYkwkertNrSarNXhQQ4iQgqOefDJUtOj78zJsYNVxUWk1MiqTyQrnV9H7+WHWf62JAR82w=="
+    },
     "@ionic-native/splash-screen": {
       "version": "4.15.0",
       "resolved": "https://registry.npmjs.org/@ionic-native/splash-screen/-/splash-screen-4.15.0.tgz",
@@ -1959,6 +1964,11 @@
       "resolved": "https://registry.npmjs.org/cordova-plugin-ionic-webview/-/cordova-plugin-ionic-webview-2.2.0.tgz",
       "integrity": "sha512-mNTJaIRsz83Vntk2d3jrPCnlqEPQsfOJW6U2AzS7WV1T15Jj/STdXI/Uv1vIyvPVd9h1OLF+yu64ZsmQH2VRMQ=="
     },
+    "cordova-plugin-network-information": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/cordova-plugin-network-information/-/cordova-plugin-network-information-2.0.1.tgz",
+      "integrity": "sha1-6QQh9DDGq3bUCSI/Jfzvu7zhdpA="
+    },
     "cordova-plugin-splashscreen": {
       "version": "5.0.2",
       "resolved": "https://registry.npmjs.org/cordova-plugin-splashscreen/-/cordova-plugin-splashscreen-5.0.2.tgz",
diff --git a/package.json b/package.json
index 8ab7c83..a34738e 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "@angular/platform-browser": "5.2.11",
     "@angular/platform-browser-dynamic": "5.2.11",
     "@ionic-native/core": "~4.15.0",
+    "@ionic-native/network": "^4.17.0",
     "@ionic-native/splash-screen": "~4.15.0",
     "@ionic-native/status-bar": "~4.15.0",
     "@ionic/storage": "2.2.0",
@@ -31,6 +32,7 @@
     "cordova-plugin-device": "^2.0.2",
     "cordova-plugin-ionic-keyboard": "^2.1.3",
     "cordova-plugin-ionic-webview": "^2.2.0",
+    "cordova-plugin-network-information": "2.0.1",
     "cordova-plugin-splashscreen": "^5.0.2",
     "cordova-plugin-statusbar": "^2.4.2",
     "cordova-plugin-whitelist": "^1.3.3",
@@ -56,11 +58,12 @@
         "ANDROID_SUPPORT_ANNOTATIONS_VERSION": "27.+"
       },
       "cordova-plugin-ionic-keyboard": {},
-      "wifiwizard2": {}
+      "wifiwizard2": {},
+      "cordova-plugin-network-information": {}
     },
     "platforms": [
       "android",
       "browser"
     ]
   }
-}
+}
\ No newline at end of file
diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index 69d51d9..0f6bf88 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -8,7 +8,6 @@ import { openSenseApp } from './app.component';
 import { HomePage } from '../pages/home/home';
 import { ApiProvider } from '../providers/api/api';
 import { HttpClientModule } from '@angular/common/http';
-import { OtaWifiProvider } from '../providers/ota-wifi/ota-wifi';
 import { OtaWizardPage } from '../pages/ota-wizard/ota-wizard';
 import { OtaWizardPageModule } from '../pages/ota-wizard/ota-wizard.module';
 
@@ -34,7 +33,6 @@ import { OtaWizardPageModule } from '../pages/ota-wizard/ota-wizard.module';
     SplashScreen,
     {provide: ErrorHandler, useClass: IonicErrorHandler},
     ApiProvider,
-    OtaWifiProvider
   ]
 })
 export class AppModule {}
diff --git a/src/pages/Blockly/blockly.ts b/src/pages/Blockly/blockly.ts
index 86ef125..d6b2e77 100644
--- a/src/pages/Blockly/blockly.ts
+++ b/src/pages/Blockly/blockly.ts
@@ -1,6 +1,5 @@
 import { Component } from '@angular/core';
 import { IonicPage, NavController, NavParams } from 'ionic-angular';
-import { OtaWifiProvider } from '../../providers/ota-wifi/ota-wifi';
 import { OtaWizardPage } from '../ota-wizard/ota-wizard';
 
 /**
@@ -19,13 +18,7 @@ export class BlocklyPage {
 
   constructor(
     public navCtrl: NavController,
-    public navParams: NavParams,
-    private otaWifi: OtaWifiProvider) {
-      // otaWifi is here only for testing, should later be encapsulated by OtaWizardComponent
-      console.log('wifi strategy:', otaWifi.strategy)
-      otaWifi.findSenseboxes()
-        .then(console.log)
-        .catch(console.error)
+    public navParams: NavParams) {
   }
 
   ionViewDidLoad() {
diff --git a/src/pages/ota-wizard/ota-wizard.html b/src/pages/ota-wizard/ota-wizard.html
index d8275ec..f7a8052 100644
--- a/src/pages/ota-wizard/ota-wizard.html
+++ b/src/pages/ota-wizard/ota-wizard.html
@@ -38,12 +38,33 @@
       </ion-grid>
     </ion-slide>
 
+    <!-- compilation waiting screen -->
     <ion-slide>
-      <h1>Check internet connection for compilation</h1>
-      <pre style="text-align: left">
-        - if connected: background: compile code
-        - if not: enable wifi (manually on iOS)
-      </pre>
+      <ng-container *ngIf="state.compilation == 'compiling'">
+        <h2>Compiling your sketch...</h2>
+        <ion-spinner item-start name="dots"></ion-spinner>
+      </ng-container>
+
+      <ng-container *ngIf="state.compilation == 'go-online'">
+        <h2>You are offline.</h2>
+        <p>
+          For compilation, you need to connect to the internet.
+          Please enable a connection.
+        </p>
+      </ng-container>
+
+      <ng-container *ngIf="state.compilation == 'done'">
+        <h2>Sketch successfully compiled.</h2>
+        <button ion-button large clear icon-end color="primary" (click)="slides.slideNext()">
+          Continue
+          <ion-icon name="arrow-forward"></ion-icon>
+        </button>
+      </ng-container>
+
+      <ng-container *ngIf="state.compilation == 'error'">
+        <h2>Error compiling your sketch.</h2>
+        <!-- TODO <p>{{ status }}</p> -->
+      </ng-container>
     </ion-slide>
 
     <ion-slide>
diff --git a/src/pages/ota-wizard/ota-wizard.module.ts b/src/pages/ota-wizard/ota-wizard.module.ts
index 3e8650c..2b902cd 100644
--- a/src/pages/ota-wizard/ota-wizard.module.ts
+++ b/src/pages/ota-wizard/ota-wizard.module.ts
@@ -1,6 +1,8 @@
 import { NgModule } from '@angular/core';
 import { IonicPageModule } from 'ionic-angular';
 import { OtaWizardPage } from './ota-wizard';
+import { Network } from '@ionic-native/network';
+import { OtaWifiProvider } from '../../providers/ota-wifi/ota-wifi';
 
 @NgModule({
   declarations: [
@@ -9,5 +11,9 @@ import { OtaWizardPage } from './ota-wizard';
   imports: [
     IonicPageModule.forChild(OtaWizardPage),
   ],
+  providers: [
+    Network,
+    OtaWifiProvider,
+  ]
 })
 export class OtaWizardPageModule {}
diff --git a/src/pages/ota-wizard/ota-wizard.ts b/src/pages/ota-wizard/ota-wizard.ts
index 63a3fc3..8f5f9cb 100644
--- a/src/pages/ota-wizard/ota-wizard.ts
+++ b/src/pages/ota-wizard/ota-wizard.ts
@@ -1,25 +1,132 @@
-import { Component } from '@angular/core';
-import { IonicPage, NavController, NavParams } from 'ionic-angular';
+import {
+  Component,
+  OnDestroy,
+  OnInit,
+  ViewChild,
+} from '@angular/core'
+import {
+  IonicPage,
+  Slides,
+} from 'ionic-angular'
+import { Network } from '@ionic-native/network'
+import { Subscription } from 'rxjs/Subscription';
 
-/**
- * Generated class for the OtaWizardPage page.
- *
- * See https://ionicframework.com/docs/components/#navigation for more info on
- * Ionic pages and navigation.
- */
+import { OtaWifiProvider, WifiStrategy } from '../../providers/ota-wifi/ota-wifi';
 
 @IonicPage()
 @Component({
   selector: 'page-ota-wizard',
   templateUrl: 'ota-wizard.html',
 })
-export class OtaWizardPage {
+export class OtaWizardPage implements OnInit, OnDestroy {
+  @ViewChild(Slides) slides: Slides
+  onlineSub: Subscription
+  offlineSub: Subscription
 
-  constructor(public navCtrl: NavController, public navParams: NavParams) {
+  compilationFailed: boolean
+
+  state: OtaState = {
+    isOnline: false,
+    compiledSketch: undefined,
+    compilation: 'compiling',
   }
 
-  ionViewDidLoad() {
-    console.log('ionViewDidLoad OtaWizardPage');
+  constructor(
+    private network: Network,
+    private otaWifi: OtaWifiProvider,
+  ) {
   }
 
+  ngOnInit() {
+    // try to start compilation already in the background
+    this.compileSketch()
+
+    this.state.isOnline = this.network.type !== 'none'
+
+    this.onlineSub = this.network.onConnect().subscribe(() => {
+      this.state.isOnline = true
+      // trigger compilation, only when needed
+      if (this.state.compilation == 'go-online') this.compileSketch()
+    })
+
+    this.offlineSub = this.network.onDisconnect().subscribe(() => {
+      this.state.isOnline = false
+    })
+  }
+
+  ngOnDestroy () {
+    this.onlineSub.unsubscribe()
+    this.offlineSub.unsubscribe()
+  }
+
+  // call logic for each slide
+  onSlideChange () {
+    switch (this.slides.getActiveIndex()) {
+      case OtaSlides.Intro:
+        this.slides.lockSwipeToNext(false)
+        break
+
+      case OtaSlides.Compilation:
+        this.handleCompilation()
+        break
+
+      case OtaSlides.WifiSelection:
+        this.handleWifiSelection()
+        break
+
+      case OtaSlides.Status:
+        break
+
+      default:
+        console.warn('unknown slide, please define its logic')
+    }
+  }
+
+  private handleCompilation () {
+    this.slides.lockSwipeToNext(!this.state.compiledSketch)
+
+    // need to go online for compilation. compilation is retriggered via this.onlineSub
+    if (!this.state.compiledSketch && !this.state.isOnline) {
+      switch (this.otaWifi.strategy) {
+        case WifiStrategy.Automatic:
+          // TODO: auto connect to previous network, if available
+        default:
+          this.state.compilation = 'go-online'
+          break
+      }
+    }
+  }
+
+  private handleWifiSelection () {
+    this.slides.lockSwipeToNext(true)
+
+    console.log('wifi strategy:', this.otaWifi.strategy)
+    this.otaWifi.findSenseboxes()
+      .then(console.log)
+      .catch(console.error)
+  }
+
+  private compileSketch () {
+    // TODO: mock
+    this.state.compilation = 'compiling'
+    setTimeout(() => {
+      this.state.compiledSketch = 'firmware binary here..'
+      this.state.compilation = 'done'
+      this.slides.lockSwipeToNext(false)
+    }, 4000)
+  }
+}
+
+type OtaState = {
+  isOnline: boolean,
+  compiledSketch: any,
+  compilation: 'compiling' | 'go-online' | 'done' | 'error',
+}
+
+// names for the slide indices for easier access
+enum OtaSlides {
+  Intro = 0,
+  Compilation = 1,
+  WifiSelection = 2,
+  Status = 3,
 }
diff --git a/src/providers/ota-wifi/ota-wifi.ts b/src/providers/ota-wifi/ota-wifi.ts
index a3f46a5..5b03c2d 100644
--- a/src/providers/ota-wifi/ota-wifi.ts
+++ b/src/providers/ota-wifi/ota-wifi.ts
@@ -17,32 +17,30 @@ export class OtaWifiProvider {
   public strategy: WifiStrategy
 
   constructor(private platform: Platform, private http: HttpClient) {
-    this.selectStrategy()
+    this.strategy = this.selectStrategy()
   }
 
   private selectStrategy (): WifiStrategy {
     try {
       // check if plugin is available (e.g. not in browser builds)
       WifiWizard2
-
-      if (
-        this.platform.is('android') ||
-        this.platform.is('ios') && this.platform.version().major >= 11
-      ) {
-        this.strategy = WifiStrategy.Automatic
-      } else {
-        this.strategy = WifiStrategy.Manual
-      }
     } catch (err) {
-      this.strategy = WifiStrategy.Unavailable
+      return WifiStrategy.Unavailable
+    }
+
+    if (
+      this.platform.is('android') ||
+      this.platform.is('ios') && this.platform.version().major >= 11
+    ) {
+      return WifiStrategy.Automatic
     }
 
-    return this.strategy;
+    return WifiStrategy.Manual
   }
 
   async findSenseboxes (): Promise<string> {
     if (this.strategy != WifiStrategy.Automatic)
-      throw Error('can not search for WiFi networks on this platform')
+      throw new Error('can not search for WiFi networks on this platform')
 
     return WifiWizard2.scan()
       .then(n => n.filter(n.SSID.includes(SSID_PREFIX)))
@@ -51,7 +49,7 @@ export class OtaWifiProvider {
 
   async connectToSensebox (ssid: string): Promise<any> {
     if (this.strategy != WifiStrategy.Automatic)
-      throw Error('can not connect to WiFi network on this platform')
+      throw new Error('can not connect to WiFi network on this platform')
 
     return this.platform.is('ios')
       ? WifiWizard2.iOSConnectNetwork(ssid)
@@ -66,7 +64,7 @@ export class OtaWifiProvider {
 
 // TODO: replace with "WifiCapabilities".
 // makes it easier to check in each functions if required functionality is available
-enum WifiStrategy {
+export enum WifiStrategy {
   Automatic   = 'Automatic',   // android, iOS 11+
   Manual      = 'Manual',      // older iOS
   Unavailable = 'Unavailable', // browser