Connect and bond with a passkey

This commit adds the following:
    Passkey pairing - passkey is displayed on watch
    Swipe down to clear passkey screen
    Connection encryption
    Connection bonding
    Automatic reconnects to a bonded peripheral
    Trusted device on Android

Note that persisting the bond between reboots is NOT included in
this commit. Therefore, rebooting the watch will cause reconnect failures.
You must delete the bond from the phone to reconnect/pair.

5 files changed, 48 insertions, 0 deletions

diff --git a/src/displayapp/Apps.h b/src/displayapp/Apps.h
index d340efe..935a61a 100644
--- a/src/displayapp/Apps.h
+++ b/src/displayapp/Apps.h
@@ -25,6 +25,7 @@ namespace Pinetime {
       Metronome,
       Motion,
       Steps,
+      PassKey,
       QuickSettings,
       Settings,
       SettingWatchFace,
diff --git a/src/displayapp/DisplayApp.cpp b/src/displayapp/DisplayApp.cpp
index 8015518..08a7646 100644
--- a/src/displayapp/DisplayApp.cpp
+++ b/src/displayapp/DisplayApp.cpp
@@ -29,6 +29,7 @@
 #include "displayapp/screens/FlashLight.h"
 #include "displayapp/screens/BatteryInfo.h"
 #include "displayapp/screens/Steps.h"
+#include "displayapp/screens/PassKey.h"
 #include "displayapp/screens/Error.h"
 
 #include "drivers/Cst816s.h"
@@ -288,6 +289,9 @@ void DisplayApp::Refresh() {
         // Added to remove warning
         // What should happen here?
         break;
+      case Messages::ShowPairingKey:
+        LoadApp(Apps::PassKey, DisplayApp::FullRefreshDirections::Up);
+        break;
     }
   }
 
@@ -351,6 +355,11 @@ void DisplayApp::LoadApp(Apps app, DisplayApp::FullRefreshDirections direction)
       ReturnApp(Apps::Clock, FullRefreshDirections::Down, TouchEvents::None);
       break;
 
+    case Apps::PassKey:
+      currentScreen = std::make_unique<Screens::PassKey>(this, bleController.GetPairingKey());
+      ReturnApp(Apps::Clock, FullRefreshDirections::Down, TouchEvents::SwipeDown);
+      break;
+
     case Apps::Notifications:
       currentScreen = std::make_unique<Screens::Notifications>(
         this, notificationManager, systemTask->nimble().alertService(), motorController, Screens::Notifications::Modes::Normal);
diff --git a/src/displayapp/Messages.h b/src/displayapp/Messages.h
index 29e09eb..b22d6c3 100644
--- a/src/displayapp/Messages.h
+++ b/src/displayapp/Messages.h
@@ -19,6 +19,7 @@ namespace Pinetime {
         UpdateTimeOut,
         DimScreen,
         RestoreBrightness,
+        ShowPairingKey,
         AlarmTriggered
       };
     }
diff --git a/src/displayapp/screens/PassKey.cpp b/src/displayapp/screens/PassKey.cpp
new file mode 100644
index 0000000..66bf0c2
--- /dev/null
+++ b/src/displayapp/screens/PassKey.cpp
@@ -0,0 +1,17 @@
+#include "PassKey.h"
+#include "displayapp/DisplayApp.h"
+
+using namespace Pinetime::Applications::Screens;
+
+PassKey::PassKey(Pinetime::Applications::DisplayApp* app, uint32_t key) : Screen(app) {
+  lpasskey = lv_label_create(lv_scr_act(), nullptr);
+  lv_obj_set_style_local_text_color(lpasskey, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hex(0xFFFF00));
+  lv_obj_set_style_local_text_font(lpasskey, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_42);
+  lv_label_set_text_fmt(lpasskey, "%06u", key);
+  lv_obj_align(lpasskey, nullptr, LV_ALIGN_CENTER, 0, -20);
+}
+
+PassKey::~PassKey() {
+  lv_obj_clean(lv_scr_act());
+}
+
diff --git a/src/displayapp/screens/PassKey.h b/src/displayapp/screens/PassKey.h
new file mode 100644
index 0000000..34e0d59
--- /dev/null
+++ b/src/displayapp/screens/PassKey.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "Screen.h"
+#include <lvgl/lvgl.h>
+
+namespace Pinetime {
+  namespace Applications {
+    namespace Screens {
+
+      class PassKey : public Screen {
+      public:
+        PassKey(DisplayApp* app, uint32_t key);
+        ~PassKey() override;
+
+      private:
+        lv_obj_t* lpasskey;
+      };
+    }
+  }
+}