Merge 299edca193 into 3a0d673df4

.gitignore

@@ -7,6 +7,7 @@ cmake-build-*
 cmake-*/
 CMakeFiles
 **/CMakeCache.txt
+CMakeLists.txt.user*
 cmake_install.cmake
 Makefile
 build

doc/ble.md

@@ -14,6 +14,8 @@ This page describes the BLE implementation and API built in this firmware.
 - [BLE Services](#ble-services)
   - [CTS](#cts)
   - [ANS](#ans)
+- [BLE Clients](#ble-clients)
+  - [IAC](#iac)
 - [Getting Information](#getting-information)
   - [Firmware Version](#firmware-version)
   - [Battery Level](#battery-level)
@@ -113,6 +115,16 @@ The following custom services are implemented in InfiniTime:
 
 ![ANS sequence diagram](./ble/ans_sequence.png "ANS sequence diagram")
 
+## BLE clients
+
+### IAC
+
+InfiniTime implements Immediade Alert Service client, that can be used to send notifications to companion app.
+This is useful for "Find my Phone" functionality.
+
+More documentation about this service can be found here.
+
+[Immediade Alert Service](https://www.bluetooth.com/specifications/specs/immediate-alert-service-1-0/)
 ---
 
 ### Getting Information

src/CMakeLists.txt

@@ -385,6 +385,7 @@ list(APPEND SOURCE_FILES
         displayapp/screens/Notifications.cpp
         displayapp/screens/Twos.cpp
         displayapp/screens/HeartRate.cpp
+        displayapp/screens/FindMyPhone.cpp
         displayapp/screens/FlashLight.cpp
         displayapp/screens/List.cpp
         displayapp/screens/CheckboxList.cpp
@@ -459,6 +460,7 @@ list(APPEND SOURCE_FILES
         components/ble/BatteryInformationService.cpp
         components/ble/FSService.cpp
         components/ble/ImmediateAlertService.cpp
+        components/ble/ImmediateAlertClient.cpp
         components/ble/ServiceDiscovery.cpp
         components/ble/HeartRateService.cpp
         components/ble/MotionService.cpp
@@ -527,6 +529,7 @@ list(APPEND RECOVERY_SOURCE_FILES
         components/ble/BatteryInformationService.cpp
         components/ble/FSService.cpp
         components/ble/ImmediateAlertService.cpp
+        components/ble/ImmediateAlertClient.cpp
         components/ble/ServiceDiscovery.cpp
         components/ble/NavigationService.cpp
         components/ble/HeartRateService.cpp
@@ -606,6 +609,7 @@ set(INCLUDE_FILES
         displayapp/Apps.h
         displayapp/screens/Notifications.h
         displayapp/screens/HeartRate.h
+        displayapp/screens/FindMyPhone.h
         displayapp/screens/Metronome.h
         displayapp/screens/Motion.h
         displayapp/screens/Timer.h
@@ -645,6 +649,7 @@ set(INCLUDE_FILES
         components/ble/BatteryInformationService.h
         components/ble/FSService.h
         components/ble/ImmediateAlertService.h
+        components/ble/ImmediateAlertClient.h
         components/ble/ServiceDiscovery.h
         components/ble/BleClient.h
         components/ble/HeartRateService.h
@@ -832,7 +837,7 @@ if (${CMAKE_BUILD_TYPE} STREQUAL "Debug")
   # add_definitions(-DCLOCK_CONFIG_LOG_LEVEL=4)
   # add_definitions(-DRTC_CONFIG_LOG_ENABLED=1)
   # add_definitions(-DRTC_CONFIG_LOG_LEVEL=4)
-  
+
   # Nimble Logging
   add_definitions(-DMYNEWT_VAL_NEWT_FEATURE_LOGCFG=1)
   # add_definitions(-DMYNEWT_VAL_LOG_LEVEL=0)

src/FreeRTOSConfig.h

@@ -62,7 +62,7 @@
 #define configTICK_RATE_HZ                      1024
 #define configMAX_PRIORITIES                    (3)
 #define configMINIMAL_STACK_SIZE                (120)
-#define configTOTAL_HEAP_SIZE                   (1024 * 40)
+#define configTOTAL_HEAP_SIZE                   (1024 * 39)
 #define configMAX_TASK_NAME_LEN                 (4)
 #define configUSE_16_BIT_TICKS                  0
 #define configIDLE_SHOULD_YIELD                 1

src/components/ble/ImmediateAlertClient.cpp

@@ -0,0 +1,113 @@
+#include "components/ble/ImmediateAlertClient.h"
+#include <cstring>
+#include <nrf_log.h>
+#include "systemtask/SystemTask.h"
+
+using namespace Pinetime::Controllers;
+
+constexpr ble_uuid16_t ImmediateAlertClient::immediateAlertClientUuid;
+constexpr ble_uuid16_t ImmediateAlertClient::alertLevelCharacteristicUuid;
+
+namespace {
+  int OnDiscoveryEventCallback(uint16_t conn_handle, const struct ble_gatt_error* error, const struct ble_gatt_svc* service, void* arg) {
+    auto client = static_cast<ImmediateAlertClient*>(arg);
+    return client->OnDiscoveryEvent(conn_handle, error, service);
+  }
+
+  int OnImmediateAlertCharacteristicDiscoveredCallback(uint16_t conn_handle,
+                                                       const struct ble_gatt_error* error,
+                                                       const struct ble_gatt_chr* chr,
+                                                       void* arg) {
+    auto client = static_cast<ImmediateAlertClient*>(arg);
+    return client->OnCharacteristicDiscoveryEvent(conn_handle, error, chr);
+  }
+}
+
+ImmediateAlertClient::ImmediateAlertClient(Pinetime::System::SystemTask& systemTask)
+  : systemTask {systemTask},
+    characteristicDefinition {{
+                                .uuid = &alertLevelCharacteristicUuid.u,
+                                .arg = this,
+                                .flags = BLE_GATT_CHR_F_WRITE_NO_RSP,
+                              },
+                              {0}},
+    serviceDefinition {
+      {/* Device Information Service */
+       .type = BLE_GATT_SVC_TYPE_PRIMARY,
+       .uuid = &immediateAlertClientUuid.u,
+       .characteristics = characteristicDefinition},
+      {0},
+    } {
+}
+
+void ImmediateAlertClient::Init() {
+}
+
+bool ImmediateAlertClient::OnDiscoveryEvent(uint16_t connectionHandle, const ble_gatt_error* error, const ble_gatt_svc* service) {
+  if (service == nullptr && error->status == BLE_HS_EDONE) {
+    if (isDiscovered) {
+      NRF_LOG_INFO("IAS found, starting characteristics discovery");
+
+      ble_gattc_disc_all_chrs(connectionHandle, iasStartHandle, iasEndHandle, OnImmediateAlertCharacteristicDiscoveredCallback, this);
+    } else {
+      NRF_LOG_INFO("IAS not found");
+      onServiceDiscovered(connectionHandle);
+    }
+    return true;
+  }
+
+  if (service != nullptr && ble_uuid_cmp(&immediateAlertClientUuid.u, &service->uuid.u) == 0) {
+    NRF_LOG_INFO("IAS discovered : 0x%x - 0x%x", service->start_handle, service->end_handle);
+    isDiscovered = true;
+    iasStartHandle = service->start_handle;
+    iasEndHandle = service->end_handle;
+  }
+  return false;
+}
+
+int ImmediateAlertClient::OnCharacteristicDiscoveryEvent(uint16_t conn_handle,
+                                                         const ble_gatt_error* error,
+                                                         const ble_gatt_chr* characteristic) {
+
+  if (error->status != 0 && error->status != BLE_HS_EDONE) {
+    NRF_LOG_INFO("IAS Characteristic discovery ERROR");
+    onServiceDiscovered(conn_handle);
+    return 0;
+  }
+
+  if (characteristic == nullptr && error->status == BLE_HS_EDONE) {
+    if (!isCharacteristicDiscovered) {
+      NRF_LOG_INFO("IAS Characteristic discovery unsuccessful");
+      onServiceDiscovered(conn_handle);
+    }
+
+    return 0;
+  }
+
+  if (characteristic != nullptr && ble_uuid_cmp(&alertLevelCharacteristicUuid.u, &characteristic->uuid.u) == 0) {
+    NRF_LOG_INFO("AIS Characteristic discovered : 0x%x", characteristic->val_handle);
+    isCharacteristicDiscovered = true;
+    alertLevelHandle = characteristic->val_handle;
+  }
+  return 0;
+}
+
+void ImmediateAlertClient::Discover(uint16_t connectionHandle, std::function<void(uint16_t)> onServiceDiscovered) {
+  NRF_LOG_INFO("[IAS] Starting discovery");
+  this->onServiceDiscovered = onServiceDiscovered;
+  ble_gattc_disc_svc_by_uuid(connectionHandle, &immediateAlertClientUuid.u, OnDiscoveryEventCallback, this);
+}
+
+bool ImmediateAlertClient::sendImmediateAlert(ImmediateAlertClient::Levels level) {
+
+  auto* om = ble_hs_mbuf_from_flat(&level, 1);
+
+  uint16_t connectionHandle = systemTask.nimble().connHandle();
+
+  if (connectionHandle == 0 || connectionHandle == BLE_HS_CONN_HANDLE_NONE) {
+    return false;
+  }
+
+  ble_gattc_write_no_rsp(connectionHandle, alertLevelHandle, om);
+  return true;
+}

src/components/ble/ImmediateAlertClient.h

@@ -0,0 +1,61 @@
+#pragma once
+#define min // workaround: nimble's min/max macros conflict with libstdc++
+#define max
+#include <host/ble_gap.h>
+#undef max
+#undef min
+#include <cstdint>
+#include "components/ble/BleClient.h"
+
+namespace Pinetime {
+  namespace System {
+    class SystemTask;
+  }
+
+  namespace Controllers {
+    class NotificationManager;
+
+    class ImmediateAlertClient : public BleClient {
+    public:
+      enum class Levels : uint8_t { NoAlert = 0, MildAlert = 1, HighAlert = 2 };
+
+      ImmediateAlertClient(Pinetime::System::SystemTask& systemTask);
+      void Init();
+
+      bool OnDiscoveryEvent(uint16_t connectionHandle, const ble_gatt_error* error, const ble_gatt_svc* service);
+      int OnCharacteristicDiscoveryEvent(uint16_t conn_handle, const ble_gatt_error* error, const ble_gatt_chr* characteristic);
+
+      bool sendImmediateAlert(Levels level);
+
+      static constexpr const ble_uuid16_t* Uuid() {
+        return &ImmediateAlertClient::immediateAlertClientUuid;
+      }
+
+      static constexpr const ble_uuid16_t* AlertLevelCharacteristicUuid() {
+        return &ImmediateAlertClient::alertLevelCharacteristicUuid;
+      }
+
+      void Discover(uint16_t connectionHandle, std::function<void(uint16_t)> lambda) override;
+
+    private:
+      Pinetime::System::SystemTask& systemTask;
+
+      static constexpr uint16_t immediateAlertClientId {0x1802};
+      static constexpr uint16_t alertLevelId {0x2A06};
+
+      static constexpr ble_uuid16_t immediateAlertClientUuid {.u {.type = BLE_UUID_TYPE_16}, .value = immediateAlertClientId};
+      static constexpr ble_uuid16_t alertLevelCharacteristicUuid {.u {.type = BLE_UUID_TYPE_16}, .value = alertLevelId};
+
+      bool isDiscovered = false;
+      uint16_t iasStartHandle;
+      uint16_t iasEndHandle;
+      bool isCharacteristicDiscovered = false;
+
+      struct ble_gatt_chr_def characteristicDefinition[3];
+      struct ble_gatt_svc_def serviceDefinition[2];
+
+      uint16_t alertLevelHandle;
+      std::function<void(uint16_t)> onServiceDiscovered;
+    };
+  }
+}

src/components/ble/NimbleController.cpp

@@ -46,10 +46,11 @@ NimbleController::NimbleController(Pinetime::System::SystemTask& systemTask,
     weatherService {dateTimeController},
     batteryInformationService {batteryController},
     immediateAlertService {systemTask, notificationManager},
+    iaClient {systemTask},
     heartRateService {*this, heartRateController},
     motionService {*this, motionController},
     fsService {systemTask, fs},
-    serviceDiscovery({&currentTimeClient, &alertNotificationClient}) {
+    serviceDiscovery({&currentTimeClient, &alertNotificationClient, &iaClient}) {
 }
 
 void nimble_on_reset(int reason) {
@@ -95,6 +96,7 @@ void NimbleController::Init() {
   dfuService.Init();
   batteryInformationService.Init();
   immediateAlertService.Init();
+  iaClient.Init();
   heartRateService.Init();
   motionService.Init();
   fsService.Init();

src/components/ble/NimbleController.h

@@ -17,6 +17,7 @@
 #include "components/ble/FSService.h"
 #include "components/ble/HeartRateService.h"
 #include "components/ble/ImmediateAlertService.h"
+#include "components/ble/ImmediateAlertClient.h"
 #include "components/ble/MusicService.h"
 #include "components/ble/NavigationService.h"
 #include "components/ble/ServiceDiscovery.h"
@@ -71,6 +72,10 @@ namespace Pinetime {
         return weatherService;
       };
 
+      Pinetime::Controllers::ImmediateAlertClient& immediateAlertClient() {
+        return iaClient;
+      }
+
       uint16_t connHandle();
       void NotifyBatteryLevel(uint8_t level);
 
@@ -103,6 +108,7 @@ namespace Pinetime {
       NavigationService navService;
       BatteryInformationService batteryInformationService;
       ImmediateAlertService immediateAlertService;
+      ImmediateAlertClient iaClient;
       HeartRateService heartRateService;
       MotionService motionService;
       FSService fsService;

src/components/ble/ServiceDiscovery.cpp

@@ -4,7 +4,7 @@
 
 using namespace Pinetime::Controllers;
 
-ServiceDiscovery::ServiceDiscovery(std::array<BleClient*, 2>&& clients) : clients {clients} {
+ServiceDiscovery::ServiceDiscovery(std::array<BleClient*, 3>&& clients) : clients {clients} {
 }
 
 void ServiceDiscovery::StartDiscovery(uint16_t connectionHandle) {
@@ -29,4 +29,4 @@ void ServiceDiscovery::DiscoverNextService(uint16_t connectionHandle) {
     this->OnServiceDiscovered(connectionHandle);
   };
   (*clientIterator)->Discover(connectionHandle, discoverNextService);
-}
+}

src/components/ble/ServiceDiscovery.h

@@ -9,13 +9,13 @@ namespace Pinetime {
 
     class ServiceDiscovery {
     public:
-      ServiceDiscovery(std::array<BleClient*, 2>&& bleClients);
+      ServiceDiscovery(std::array<BleClient*, 3>&& bleClients);
 
       void StartDiscovery(uint16_t connectionHandle);
 
     private:
       BleClient** clientIterator;
-      std::array<BleClient*, 2> clients;
+      std::array<BleClient*, 3> clients;
       void OnServiceDiscovered(uint16_t connectionHandle);
       void DiscoverNextService(uint16_t connectionHandle);
     };

src/displayapp/DisplayApp.cpp

@@ -1,6 +1,7 @@
 #include "displayapp/DisplayApp.h"
 #include <libraries/log/nrf_log.h>
 #include "displayapp/screens/HeartRate.h"
+#include "displayapp/screens/FindMyPhone.h"
 #include "displayapp/screens/Motion.h"
 #include "displayapp/screens/Timer.h"
 #include "displayapp/screens/Alarm.h"

src/displayapp/apps/Apps.h.in

@@ -42,6 +42,7 @@ namespace Pinetime {
       SettingChimes,
       SettingShakeThreshold,
       SettingBluetooth,
+      FindMyPhone,
       Error
     };
 

src/displayapp/apps/CMakeLists.txt

@@ -13,6 +13,7 @@ else ()
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Dice")
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Metronome")
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Navigation")
+    set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::FindMyPhone")
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Weather")
     #set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Motion")
     set(USERAPP_TYPES "${DEFAULT_USER_APP_TYPES}" CACHE STRING "List of user apps to build into the firmware")

src/displayapp/fonts/fonts.json

@@ -7,7 +7,7 @@
          },
          {
             "file": "FontAwesome5-Solid+Brands+Regular.woff",
-            "range": "0xf294, 0xf242, 0xf54b, 0xf21e, 0xf1e6, 0xf017, 0xf129, 0xf03a, 0xf185, 0xf560, 0xf001, 0xf3fd, 0xf1fc, 0xf45d, 0xf59f, 0xf5a0, 0xf027, 0xf028, 0xf6a9, 0xf04b, 0xf04c, 0xf048, 0xf051, 0xf095, 0xf3dd, 0xf04d, 0xf2f2, 0xf024, 0xf252, 0xf569, 0xf06e, 0xf015, 0xf00c, 0xf0f3, 0xf522, 0xf743"
+            "range": "0xf294, 0xf242, 0xf54b, 0xf21e, 0xf1e6, 0xf017, 0xf129, 0xf03a, 0xf185, 0xf560, 0xf001, 0xf3fd, 0xf1fc, 0xf45d, 0xf59f, 0xf5a0, 0xf027, 0xf028, 0xf6a9, 0xf04b, 0xf04c, 0xf048, 0xf051, 0xf095, 0xf3dd, 0xf04d, 0xf2f2, 0xf024, 0xf252, 0xf569, 0xf06e, 0xf015, 0xf00c, 0xf0f3, 0xf522, 0xf743, 0xf002"
          }
       ],
       "bpp": 1,

src/displayapp/screens/FindMyPhone.cpp

@@ -0,0 +1,126 @@
+#include "displayapp/screens/FindMyPhone.h"
+#include <lvgl/lvgl.h>
+
+#include "displayapp/DisplayApp.h"
+#include "displayapp/InfiniTimeTheme.h"
+
+using namespace Pinetime::Applications::Screens;
+
+namespace {
+  static constexpr char defaultLabelText[] = "Find my phone";
+  static constexpr char alertSentLabelText[] = "Alert sent";
+  static constexpr char noConnectionLabelText[] = "No connection";
+  static constexpr auto restoreLabelTimeoutTicks = pdMS_TO_TICKS(2 * 1000);
+
+  void btnImmediateAlertEventHandler(lv_obj_t* obj, lv_event_t event) {
+    auto* screen = static_cast<FindMyPhone*>(obj->user_data);
+    screen->OnImmediateAlertEvent(obj, event);
+  }
+
+  void RestoreLabelTaskCallback(lv_task_t* task) {
+    auto* screen = static_cast<FindMyPhone*>(task->user_data);
+    screen->RestoreLabelText();
+    screen->StopRestoreLabelTask();
+  }
+}
+
+FindMyPhone::FindMyPhone(Pinetime::Controllers::ImmediateAlertClient& immediateAlertClient) : immediateAlertClient {immediateAlertClient} {
+  last_level = Pinetime::Controllers::ImmediateAlertClient::Levels::NoAlert;
+
+  container = lv_cont_create(lv_scr_act(), nullptr);
+
+  lv_obj_set_size(container, LV_HOR_RES, LV_VER_RES);
+  lv_obj_set_style_local_bg_color(container, LV_CONT_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  lv_obj_set_style_local_pad_all(container, LV_CONT_PART_MAIN, LV_STATE_DEFAULT, 0);
+  lv_obj_set_style_local_pad_inner(container, LV_CONT_PART_MAIN, LV_STATE_DEFAULT, 0);
+  lv_obj_set_style_local_border_width(container, LV_CONT_PART_MAIN, LV_STATE_DEFAULT, 0);
+
+  label_title = lv_label_create(lv_scr_act(), nullptr);
+
+  lv_label_set_text_static(label_title, defaultLabelText);
+  lv_obj_set_style_local_text_color(label_title, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+  lv_obj_align(label_title, nullptr, LV_ALIGN_CENTER, 0, -40);
+
+  bt_none = lv_btn_create(container, nullptr);
+  bt_none->user_data = this;
+  lv_obj_set_event_cb(bt_none, btnImmediateAlertEventHandler);
+  lv_obj_set_size(bt_none, 76, 76);
+  lv_obj_align(bt_none, nullptr, LV_ALIGN_IN_BOTTOM_LEFT, 0, 0);
+  label_none = lv_label_create(bt_none, nullptr);
+  lv_label_set_text_static(label_none, "None");
+  lv_obj_set_style_local_bg_color(bt_none, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+
+  bt_mild = lv_btn_create(container, nullptr);
+  bt_mild->user_data = this;
+  lv_obj_set_event_cb(bt_mild, btnImmediateAlertEventHandler);
+  lv_obj_set_size(bt_mild, 76, 76);
+  lv_obj_align(bt_mild, nullptr, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
+  label_mild = lv_label_create(bt_mild, nullptr);
+  lv_label_set_text_static(label_mild, "Mild");
+  lv_obj_set_style_local_bg_color(bt_mild, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::highlight);
+
+  bt_high = lv_btn_create(container, nullptr);
+  bt_high->user_data = this;
+  lv_obj_set_event_cb(bt_high, btnImmediateAlertEventHandler);
+  lv_obj_set_size(bt_high, 76, 76);
+  lv_obj_align(bt_high, nullptr, LV_ALIGN_IN_BOTTOM_RIGHT, 0, 0);
+  label_high = lv_label_create(bt_high, nullptr);
+  lv_label_set_text_static(label_high, "High");
+  lv_obj_set_style_local_bg_color(bt_high, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_RED);
+}
+
+FindMyPhone::~FindMyPhone() {
+  lv_obj_clean(lv_scr_act());
+}
+
+void FindMyPhone::OnImmediateAlertEvent(lv_obj_t* obj, lv_event_t event) {
+  if (event == LV_EVENT_CLICKED) {
+    if (obj == bt_none) {
+      last_level = Pinetime::Controllers::ImmediateAlertClient::Levels::NoAlert;
+    } else if (obj == bt_mild) {
+      last_level = Pinetime::Controllers::ImmediateAlertClient::Levels::MildAlert;
+    } else if (obj == bt_high) {
+      last_level = Pinetime::Controllers::ImmediateAlertClient::Levels::HighAlert;
+    }
+    UpdateImmediateAlerts();
+  }
+}
+
+void FindMyPhone::UpdateImmediateAlerts() {
+  switch (last_level) {
+    case Pinetime::Controllers::ImmediateAlertClient::Levels::NoAlert:
+      lv_obj_set_style_local_text_color(label_title, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+      break;
+    case Pinetime::Controllers::ImmediateAlertClient::Levels::MildAlert:
+      lv_obj_set_style_local_text_color(label_title, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::highlight);
+      break;
+    case Pinetime::Controllers::ImmediateAlertClient::Levels::HighAlert:
+      lv_obj_set_style_local_text_color(label_title, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_RED);
+      break;
+  }
+  if (immediateAlertClient.sendImmediateAlert(last_level)) {
+    lv_label_set_text_static(label_title, alertSentLabelText);
+  } else {
+    lv_label_set_text_static(label_title, noConnectionLabelText);
+  }
+  ScheduleRestoreLabelTask();
+}
+
+void FindMyPhone::ScheduleRestoreLabelTask() {
+  if (taskRestoreLabelText) {
+    return;
+  }
+  taskRestoreLabelText = lv_task_create(RestoreLabelTaskCallback, restoreLabelTimeoutTicks, LV_TASK_PRIO_MID, this);
+}
+
+void FindMyPhone::StopRestoreLabelTask() {
+  if (taskRestoreLabelText) {
+    lv_task_del(taskRestoreLabelText);
+    taskRestoreLabelText = nullptr;
+  }
+}
+
+void FindMyPhone::RestoreLabelText() {
+  lv_label_set_text_static(label_title, defaultLabelText);
+  lv_obj_set_style_local_text_color(label_title, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+}

src/displayapp/screens/FindMyPhone.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#include <cstdint>
+#include <chrono>
+#include "displayapp/screens/Screen.h"
+#include "Symbols.h"
+#include "systemtask/SystemTask.h"
+#include "components/ble/ImmediateAlertClient.h"
+
+#include <lvgl/src/lv_core/lv_style.h>
+#include <lvgl/src/lv_core/lv_obj.h>
+
+namespace Pinetime {
+
+  namespace Controllers {
+    class ImmediateAlertClient;
+  }
+
+  namespace Applications {
+    namespace Screens {
+
+      class FindMyPhone : public Screen {
+      public:
+        explicit FindMyPhone(Pinetime::Controllers::ImmediateAlertClient& immediateAlertClient);
+        ~FindMyPhone() override;
+
+        void OnImmediateAlertEvent(lv_obj_t* obj, lv_event_t event);
+
+        void ScheduleRestoreLabelTask();
+        void StopRestoreLabelTask();
+        void RestoreLabelText();
+
+      private:
+        Pinetime::Controllers::ImmediateAlertClient& immediateAlertClient;
+
+        void UpdateImmediateAlerts();
+
+        lv_obj_t* container;
+        lv_obj_t* label_title;
+        lv_obj_t* bt_none;
+        lv_obj_t* bt_high;
+        lv_obj_t* bt_mild;
+        lv_obj_t* label_none;
+        lv_obj_t* label_high;
+        lv_obj_t* label_mild;
+        lv_task_t* taskRestoreLabelText = nullptr;
+
+        Pinetime::Controllers::ImmediateAlertClient::Levels last_level;
+      };
+    }
+
+    template <>
+    struct AppTraits<Apps::FindMyPhone> {
+      static constexpr Apps app = Apps::FindMyPhone;
+      static constexpr const char* icon = Screens::Symbols::magnifyingGlass;
+
+      static Screens::Screen* Create(AppControllers& controllers) {
+        return new Screens::FindMyPhone(controllers.systemTask->nimble().immediateAlertClient());
+      };
+    };
+  }
+}

src/displayapp/screens/Symbols.h

@@ -39,6 +39,7 @@ namespace Pinetime {
         static constexpr const char* eye = "\xEF\x81\xAE";
         static constexpr const char* home = "\xEF\x80\x95";
         static constexpr const char* sleep = "\xEE\xBD\x84";
+        static constexpr const char* magnifyingGlass = "\xEF\x80\x82"; // f002
 
         // fontawesome_weathericons.c
         // static constexpr const char* sun = "\xEF\x86\x85";