[FL-2957] Unified Info API, App Error, Data Xchange (#1998)

* Update protobuf definitions
* Add Property subsystem entry point function
* Key-based system info and power info function stubs
* Remove unneeded functions
* Working power info
* Working system info
* Replace #defines with string literals
* Remove unneeded field
* Simplify system info formatting
* Refactor output callback handling
* Handle the last info element correctly
* Optimise power info, rename methods
* Add comments
* Add power debug
* Remove unneeded definitions
* Rename some files and functions
* Update protobuf definitions
* Implement App GetError and DataExchange APIs
* Send GetErrorReply with correct command_id
* Add RPC debug app stub
* Add more scenes
* Add warning, increase stack size
* Add receive data exchange scene
* Improve data exchange
* Add notifications
* Update application requirements
* Bump format version for property-based infos
* Correctly reset error text
* RCP: sync protobuf repo to latest release tag

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/debug/rpc_debug_app/application.fam

@@ -0,0 +1,10 @@
+App(
+    appid="rpc_debug",
+    name="RPC Debug",
+    apptype=FlipperAppType.DEBUG,
+    entry_point="rpc_debug_app",
+    requires=["gui", "rpc_start", "notification"],
+    stack_size=2 * 1024,
+    order=10,
+    fap_category="Debug",
+)

applications/debug/rpc_debug_app/rpc_debug_app.c

@@ -0,0 +1,138 @@
+#include "rpc_debug_app.h"
+#include <core/log.h>
+
+#include <string.h>
+
+static bool rpc_debug_app_custom_event_callback(void* context, uint32_t event) {
+    furi_assert(context);
+    RpcDebugApp* app = context;
+    return scene_manager_handle_custom_event(app->scene_manager, event);
+}
+
+static bool rpc_debug_app_back_event_callback(void* context) {
+    furi_assert(context);
+    RpcDebugApp* app = context;
+    return scene_manager_handle_back_event(app->scene_manager);
+}
+
+static void rpc_debug_app_tick_event_callback(void* context) {
+    furi_assert(context);
+    RpcDebugApp* app = context;
+    scene_manager_handle_tick_event(app->scene_manager);
+}
+
+static void rpc_debug_app_rpc_command_callback(RpcAppSystemEvent event, void* context) {
+    furi_assert(context);
+    RpcDebugApp* app = context;
+    furi_assert(app->rpc);
+
+    if(event == RpcAppEventSessionClose) {
+        scene_manager_stop(app->scene_manager);
+        view_dispatcher_stop(app->view_dispatcher);
+        rpc_system_app_set_callback(app->rpc, NULL, NULL);
+        app->rpc = NULL;
+    } else if(event == RpcAppEventAppExit) {
+        scene_manager_stop(app->scene_manager);
+        view_dispatcher_stop(app->view_dispatcher);
+        rpc_system_app_confirm(app->rpc, RpcAppEventAppExit, true);
+    } else {
+        rpc_system_app_confirm(app->rpc, event, false);
+    }
+}
+
+static bool rpc_debug_app_rpc_init_rpc(RpcDebugApp* app, const char* args) {
+    bool ret = false;
+    if(args && strlen(args)) {
+        uint32_t rpc = 0;
+        if(sscanf(args, "RPC %lX", &rpc) == 1) {
+            app->rpc = (RpcAppSystem*)rpc;
+            rpc_system_app_set_callback(app->rpc, rpc_debug_app_rpc_command_callback, app);
+            rpc_system_app_send_started(app->rpc);
+            ret = true;
+        }
+    }
+    return ret;
+}
+
+static RpcDebugApp* rpc_debug_app_alloc() {
+    RpcDebugApp* app = malloc(sizeof(RpcDebugApp));
+
+    app->gui = furi_record_open(RECORD_GUI);
+    app->notifications = furi_record_open(RECORD_NOTIFICATION);
+    app->scene_manager = scene_manager_alloc(&rpc_debug_app_scene_handlers, app);
+    app->view_dispatcher = view_dispatcher_alloc();
+
+    view_dispatcher_set_event_callback_context(app->view_dispatcher, app);
+    view_dispatcher_set_custom_event_callback(
+        app->view_dispatcher, rpc_debug_app_custom_event_callback);
+    view_dispatcher_set_navigation_event_callback(
+        app->view_dispatcher, rpc_debug_app_back_event_callback);
+    view_dispatcher_set_tick_event_callback(
+        app->view_dispatcher, rpc_debug_app_tick_event_callback, 100);
+    view_dispatcher_attach_to_gui(app->view_dispatcher, app->gui, ViewDispatcherTypeFullscreen);
+    view_dispatcher_enable_queue(app->view_dispatcher);
+
+    app->widget = widget_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, RpcDebugAppViewWidget, widget_get_view(app->widget));
+    app->submenu = submenu_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, RpcDebugAppViewSubmenu, submenu_get_view(app->submenu));
+    app->text_box = text_box_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, RpcDebugAppViewTextBox, text_box_get_view(app->text_box));
+    app->text_input = text_input_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, RpcDebugAppViewTextInput, text_input_get_view(app->text_input));
+    app->byte_input = byte_input_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, RpcDebugAppViewByteInput, byte_input_get_view(app->byte_input));
+
+    return app;
+}
+
+static void rpc_debug_app_free(RpcDebugApp* app) {
+    view_dispatcher_remove_view(app->view_dispatcher, RpcDebugAppViewByteInput);
+    view_dispatcher_remove_view(app->view_dispatcher, RpcDebugAppViewTextInput);
+    view_dispatcher_remove_view(app->view_dispatcher, RpcDebugAppViewTextBox);
+    view_dispatcher_remove_view(app->view_dispatcher, RpcDebugAppViewSubmenu);
+    view_dispatcher_remove_view(app->view_dispatcher, RpcDebugAppViewWidget);
+
+    free(app->byte_input);
+    free(app->text_input);
+    free(app->text_box);
+    free(app->submenu);
+    free(app->widget);
+
+    free(app->scene_manager);
+    free(app->view_dispatcher);
+
+    furi_record_close(RECORD_NOTIFICATION);
+    app->notifications = NULL;
+    furi_record_close(RECORD_GUI);
+    app->gui = NULL;
+
+    if(app->rpc) {
+        rpc_system_app_set_callback(app->rpc, NULL, NULL);
+        rpc_system_app_send_exited(app->rpc);
+        app->rpc = NULL;
+    }
+
+    free(app);
+}
+
+int32_t rpc_debug_app(void* args) {
+    RpcDebugApp* app = rpc_debug_app_alloc();
+
+    if(rpc_debug_app_rpc_init_rpc(app, args)) {
+        notification_message(app->notifications, &sequence_display_backlight_on);
+        scene_manager_next_scene(app->scene_manager, RpcDebugAppSceneStart);
+    } else {
+        scene_manager_next_scene(app->scene_manager, RpcDebugAppSceneStartDummy);
+    }
+
+    view_dispatcher_run(app->view_dispatcher);
+
+    rpc_debug_app_free(app);
+    return 0;
+}

applications/debug/rpc_debug_app/rpc_debug_app.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <furi.h>
+#include <gui/gui.h>
+#include <gui/view.h>
+#include <gui/scene_manager.h>
+#include <gui/view_dispatcher.h>
+
+#include <gui/modules/widget.h>
+#include <gui/modules/submenu.h>
+#include <gui/modules/text_box.h>
+#include <gui/modules/text_input.h>
+#include <gui/modules/byte_input.h>
+
+#include <rpc/rpc_app.h>
+#include <notification/notification_messages.h>
+
+#include "scenes/rpc_debug_app_scene.h"
+
+#define DATA_STORE_SIZE 64U
+#define TEXT_STORE_SIZE 64U
+
+typedef struct {
+    Gui* gui;
+    RpcAppSystem* rpc;
+    SceneManager* scene_manager;
+    ViewDispatcher* view_dispatcher;
+    NotificationApp* notifications;
+
+    Widget* widget;
+    Submenu* submenu;
+    TextBox* text_box;
+    TextInput* text_input;
+    ByteInput* byte_input;
+
+    char text_store[TEXT_STORE_SIZE];
+    uint8_t data_store[DATA_STORE_SIZE];
+} RpcDebugApp;
+
+typedef enum {
+    RpcDebugAppViewWidget,
+    RpcDebugAppViewSubmenu,
+    RpcDebugAppViewTextBox,
+    RpcDebugAppViewTextInput,
+    RpcDebugAppViewByteInput,
+} RpcDebugAppView;
+
+typedef enum {
+    // Reserve first 100 events for button types and indexes, starting from 0
+    RpcDebugAppCustomEventInputErrorCode = 100,
+    RpcDebugAppCustomEventInputErrorText,
+    RpcDebugAppCustomEventInputDataExchange,
+    RpcDebugAppCustomEventRpcDataExchange,
+} RpcDebugAppCustomEvent;

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene.c

@@ -0,0 +1,30 @@
+#include "rpc_debug_app_scene.h"
+
+// Generate scene on_enter handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_enter,
+void (*const rpc_debug_app_on_enter_handlers[])(void*) = {
+#include "rpc_debug_app_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_event handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_event,
+bool (*const rpc_debug_app_on_event_handlers[])(void* context, SceneManagerEvent event) = {
+#include "rpc_debug_app_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_exit,
+void (*const rpc_debug_app_on_exit_handlers[])(void* context) = {
+#include "rpc_debug_app_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Initialize scene handlers configuration structure
+const SceneManagerHandlers rpc_debug_app_scene_handlers = {
+    .on_enter_handlers = rpc_debug_app_on_enter_handlers,
+    .on_event_handlers = rpc_debug_app_on_event_handlers,
+    .on_exit_handlers = rpc_debug_app_on_exit_handlers,
+    .scene_num = RpcDebugAppSceneNum,
+};

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <gui/scene_manager.h>
+
+// Generate scene id and total number
+#define ADD_SCENE(prefix, name, id) RpcDebugAppScene##id,
+typedef enum {
+#include "rpc_debug_app_scene_config.h"
+    RpcDebugAppSceneNum,
+} RpcDebugAppScene;
+#undef ADD_SCENE
+
+extern const SceneManagerHandlers rpc_debug_app_scene_handlers;
+
+// Generate scene on_enter handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_enter(void*);
+#include "rpc_debug_app_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_event handlers declaration
+#define ADD_SCENE(prefix, name, id) \
+    bool prefix##_scene_##name##_on_event(void* context, SceneManagerEvent event);
+#include "rpc_debug_app_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_exit(void* context);
+#include "rpc_debug_app_scene_config.h"
+#undef ADD_SCENE

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_config.h

@@ -0,0 +1,8 @@
+ADD_SCENE(rpc_debug_app, start, Start)
+ADD_SCENE(rpc_debug_app, start_dummy, StartDummy)
+ADD_SCENE(rpc_debug_app, test_app_error, TestAppError)
+ADD_SCENE(rpc_debug_app, test_data_exchange, TestDataExchange)
+ADD_SCENE(rpc_debug_app, input_error_code, InputErrorCode)
+ADD_SCENE(rpc_debug_app, input_error_text, InputErrorText)
+ADD_SCENE(rpc_debug_app, input_data_exchange, InputDataExchange)
+ADD_SCENE(rpc_debug_app, receive_data_exchange, ReceiveDataExchange)

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_input_data_exchange.c

@@ -0,0 +1,40 @@
+#include "../rpc_debug_app.h"
+
+static void rpc_debug_app_scene_input_data_exchange_result_callback(void* context) {
+    RpcDebugApp* app = context;
+    view_dispatcher_send_custom_event(
+        app->view_dispatcher, RpcDebugAppCustomEventInputDataExchange);
+}
+
+void rpc_debug_app_scene_input_data_exchange_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    byte_input_set_header_text(app->byte_input, "Enter data to exchange");
+    byte_input_set_result_callback(
+        app->byte_input,
+        rpc_debug_app_scene_input_data_exchange_result_callback,
+        NULL,
+        app,
+        app->data_store,
+        DATA_STORE_SIZE);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewByteInput);
+}
+
+bool rpc_debug_app_scene_input_data_exchange_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == RpcDebugAppCustomEventInputDataExchange) {
+            rpc_system_app_exchange_data(app->rpc, app->data_store, DATA_STORE_SIZE);
+            scene_manager_previous_scene(app->scene_manager);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_input_data_exchange_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    UNUSED(app);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_input_error_code.c

@@ -0,0 +1,60 @@
+#include "../rpc_debug_app.h"
+
+static bool rpc_debug_app_scene_input_error_code_validator_callback(
+    const char* text,
+    FuriString* error,
+    void* context) {
+    UNUSED(context);
+
+    for(; *text; ++text) {
+        const char c = *text;
+        if(c < '0' || c > '9') {
+            furi_string_printf(error, "%s", "Please enter\na number!");
+            return false;
+        }
+    }
+
+    return true;
+}
+
+static void rpc_debug_app_scene_input_error_code_result_callback(void* context) {
+    RpcDebugApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, RpcDebugAppCustomEventInputErrorCode);
+}
+
+void rpc_debug_app_scene_input_error_code_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    strncpy(app->text_store, "666", TEXT_STORE_SIZE);
+    text_input_set_header_text(app->text_input, "Enter error code");
+    text_input_set_validator(
+        app->text_input, rpc_debug_app_scene_input_error_code_validator_callback, NULL);
+    text_input_set_result_callback(
+        app->text_input,
+        rpc_debug_app_scene_input_error_code_result_callback,
+        app,
+        app->text_store,
+        TEXT_STORE_SIZE,
+        true);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewTextInput);
+}
+
+bool rpc_debug_app_scene_input_error_code_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == RpcDebugAppCustomEventInputErrorCode) {
+            rpc_system_app_set_error_code(app->rpc, (uint32_t)atol(app->text_store));
+            scene_manager_previous_scene(app->scene_manager);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_input_error_code_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    text_input_reset(app->text_input);
+    text_input_set_validator(app->text_input, NULL, NULL);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_input_error_text.c

@@ -0,0 +1,40 @@
+#include "../rpc_debug_app.h"
+
+static void rpc_debug_app_scene_input_error_text_result_callback(void* context) {
+    RpcDebugApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, RpcDebugAppCustomEventInputErrorText);
+}
+
+void rpc_debug_app_scene_input_error_text_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    strncpy(app->text_store, "I'm a scary error message!", TEXT_STORE_SIZE);
+    text_input_set_header_text(app->text_input, "Enter error text");
+    text_input_set_result_callback(
+        app->text_input,
+        rpc_debug_app_scene_input_error_text_result_callback,
+        app,
+        app->text_store,
+        TEXT_STORE_SIZE,
+        true);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewTextInput);
+}
+
+bool rpc_debug_app_scene_input_error_text_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == RpcDebugAppCustomEventInputErrorText) {
+            rpc_system_app_set_error_text(app->rpc, app->text_store);
+            scene_manager_previous_scene(app->scene_manager);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_input_error_text_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    text_input_reset(app->text_input);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_receive_data_exchange.c

@@ -0,0 +1,70 @@
+#include "../rpc_debug_app.h"
+
+static void rpc_debug_app_scene_start_format_hex(
+    const uint8_t* data,
+    size_t data_size,
+    char* buf,
+    size_t buf_size) {
+    furi_assert(data);
+    furi_assert(buf);
+
+    const size_t byte_width = 3;
+    const size_t line_width = 7;
+
+    data_size = MIN(data_size, buf_size / (byte_width + 1));
+
+    for(size_t i = 0; i < data_size; ++i) {
+        char* p = buf + (i * byte_width);
+        char sep = !((i + 1) % line_width) ? '\n' : ' ';
+        snprintf(p, byte_width + 1, "%02X%c", data[i], sep);
+    }
+
+    buf[buf_size - 1] = '\0';
+}
+
+static void rpc_debug_app_scene_receive_data_exchange_callback(
+    const uint8_t* data,
+    size_t data_size,
+    void* context) {
+    RpcDebugApp* app = context;
+    if(data) {
+        rpc_debug_app_scene_start_format_hex(data, data_size, app->text_store, TEXT_STORE_SIZE);
+    } else {
+        strncpy(app->text_store, "<Data empty>", TEXT_STORE_SIZE);
+    }
+    view_dispatcher_send_custom_event(app->view_dispatcher, RpcDebugAppCustomEventRpcDataExchange);
+}
+
+void rpc_debug_app_scene_receive_data_exchange_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    strncpy(app->text_store, "Received data will appear here...", TEXT_STORE_SIZE);
+
+    text_box_set_text(app->text_box, app->text_store);
+    text_box_set_font(app->text_box, TextBoxFontHex);
+
+    rpc_system_app_set_data_exchange_callback(
+        app->rpc, rpc_debug_app_scene_receive_data_exchange_callback, app);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewTextBox);
+}
+
+bool rpc_debug_app_scene_receive_data_exchange_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == RpcDebugAppCustomEventRpcDataExchange) {
+            notification_message(app->notifications, &sequence_blink_cyan_100);
+            notification_message(app->notifications, &sequence_display_backlight_on);
+            text_box_set_text(app->text_box, app->text_store);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_receive_data_exchange_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    text_box_reset(app->text_box);
+    rpc_system_app_set_data_exchange_callback(app->rpc, NULL, NULL);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_start.c

@@ -0,0 +1,57 @@
+#include "../rpc_debug_app.h"
+
+enum SubmenuIndex {
+    SubmenuIndexTestAppError,
+    SubmenuIndexTestDataExchange,
+};
+
+static void rpc_debug_app_scene_start_submenu_callback(void* context, uint32_t index) {
+    RpcDebugApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, index);
+}
+
+void rpc_debug_app_scene_start_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    Submenu* submenu = app->submenu;
+
+    submenu_add_item(
+        submenu,
+        "Test App Error",
+        SubmenuIndexTestAppError,
+        rpc_debug_app_scene_start_submenu_callback,
+        app);
+    submenu_add_item(
+        submenu,
+        "Test Data Exchange",
+        SubmenuIndexTestDataExchange,
+        rpc_debug_app_scene_start_submenu_callback,
+        app);
+
+    submenu_set_selected_item(submenu, SubmenuIndexTestAppError);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewSubmenu);
+}
+
+bool rpc_debug_app_scene_start_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    SceneManager* scene_manager = app->scene_manager;
+
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        const uint32_t submenu_index = event.event;
+        if(submenu_index == SubmenuIndexTestAppError) {
+            scene_manager_next_scene(scene_manager, RpcDebugAppSceneTestAppError);
+            consumed = true;
+        } else if(submenu_index == SubmenuIndexTestDataExchange) {
+            scene_manager_next_scene(scene_manager, RpcDebugAppSceneTestDataExchange);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_start_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    submenu_reset(app->submenu);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_start_dummy.c

@@ -0,0 +1,30 @@
+#include "../rpc_debug_app.h"
+
+void rpc_debug_app_scene_start_dummy_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    widget_add_text_box_element(
+        app->widget,
+        0,
+        0,
+        128,
+        64,
+        AlignCenter,
+        AlignCenter,
+        "This application\nis meant to be run\nin \e#RPC\e# mode.",
+        false);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewWidget);
+}
+
+bool rpc_debug_app_scene_start_dummy_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    UNUSED(app);
+    UNUSED(event);
+
+    bool consumed = false;
+    return consumed;
+}
+
+void rpc_debug_app_scene_start_dummy_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    widget_reset(app->widget);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_test_app_error.c

@@ -0,0 +1,57 @@
+#include "../rpc_debug_app.h"
+
+typedef enum {
+    SubmenuIndexSetErrorCode,
+    SubmenuIndexSetErrorText,
+} SubmenuIndex;
+
+static void rpc_debug_app_scene_test_app_error_submenu_callback(void* context, uint32_t index) {
+    RpcDebugApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, index);
+}
+
+void rpc_debug_app_scene_test_app_error_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    Submenu* submenu = app->submenu;
+
+    submenu_add_item(
+        submenu,
+        "Set Error Code",
+        SubmenuIndexSetErrorCode,
+        rpc_debug_app_scene_test_app_error_submenu_callback,
+        app);
+    submenu_add_item(
+        submenu,
+        "Set Error Text",
+        SubmenuIndexSetErrorText,
+        rpc_debug_app_scene_test_app_error_submenu_callback,
+        app);
+
+    submenu_set_selected_item(submenu, SubmenuIndexSetErrorCode);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewSubmenu);
+}
+
+bool rpc_debug_app_scene_test_app_error_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    SceneManager* scene_manager = app->scene_manager;
+
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        const uint32_t submenu_index = event.event;
+        if(submenu_index == SubmenuIndexSetErrorCode) {
+            scene_manager_next_scene(scene_manager, RpcDebugAppSceneInputErrorCode);
+            consumed = true;
+        } else if(submenu_index == SubmenuIndexSetErrorText) {
+            scene_manager_next_scene(scene_manager, RpcDebugAppSceneInputErrorText);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_test_app_error_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    submenu_reset(app->submenu);
+}

applications/debug/rpc_debug_app/scenes/rpc_debug_app_scene_test_data_exchange.c

@@ -0,0 +1,58 @@
+#include "../rpc_debug_app.h"
+
+typedef enum {
+    SubmenuIndexSendData,
+    SubmenuIndexReceiveData,
+} SubmenuIndex;
+
+static void
+    rpc_debug_app_scene_test_data_exchange_submenu_callback(void* context, uint32_t index) {
+    RpcDebugApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, index);
+}
+
+void rpc_debug_app_scene_test_data_exchange_on_enter(void* context) {
+    RpcDebugApp* app = context;
+    Submenu* submenu = app->submenu;
+
+    submenu_add_item(
+        submenu,
+        "Send Data",
+        SubmenuIndexSendData,
+        rpc_debug_app_scene_test_data_exchange_submenu_callback,
+        app);
+    submenu_add_item(
+        submenu,
+        "Receive Data",
+        SubmenuIndexReceiveData,
+        rpc_debug_app_scene_test_data_exchange_submenu_callback,
+        app);
+
+    submenu_set_selected_item(submenu, SubmenuIndexSendData);
+    view_dispatcher_switch_to_view(app->view_dispatcher, RpcDebugAppViewSubmenu);
+}
+
+bool rpc_debug_app_scene_test_data_exchange_on_event(void* context, SceneManagerEvent event) {
+    RpcDebugApp* app = context;
+    SceneManager* scene_manager = app->scene_manager;
+
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        const uint32_t submenu_index = event.event;
+        if(submenu_index == SubmenuIndexSendData) {
+            scene_manager_next_scene(scene_manager, RpcDebugAppSceneInputDataExchange);
+            consumed = true;
+        } else if(submenu_index == SubmenuIndexReceiveData) {
+            scene_manager_next_scene(scene_manager, RpcDebugAppSceneReceiveDataExchange);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void rpc_debug_app_scene_test_data_exchange_on_exit(void* context) {
+    RpcDebugApp* app = context;
+    submenu_reset(app->submenu);
+}

applications/services/cli/cli_commands.c

@@ -25,7 +25,7 @@ void cli_command_device_info_callback(const char* key, const char* value, bool l
 void cli_command_device_info(Cli* cli, FuriString* args, void* context) {
     UNUSED(cli);
     UNUSED(args);
-    furi_hal_info_get(cli_command_device_info_callback, context);
+    furi_hal_info_get(cli_command_device_info_callback, '_', context);
 }
 
 void cli_command_help(Cli* cli, FuriString* args, void* context) {

applications/services/power/power_cli.c

@@ -26,7 +26,7 @@ void power_cli_reboot2dfu(Cli* cli, FuriString* args) {
     power_reboot(PowerBootModeDfu);
 }
 
-static void power_cli_info_callback(const char* key, const char* value, bool last, void* context) {
+static void power_cli_callback(const char* key, const char* value, bool last, void* context) {
     UNUSED(last);
     UNUSED(context);
     printf("%-24s: %s\r\n", key, value);
@@ -35,13 +35,13 @@ static void power_cli_info_callback(const char* key, const char* value, bool las
 void power_cli_info(Cli* cli, FuriString* args) {
     UNUSED(cli);
     UNUSED(args);
-    furi_hal_power_info_get(power_cli_info_callback, NULL);
+    furi_hal_power_info_get(power_cli_callback, '_', NULL);
 }
 
 void power_cli_debug(Cli* cli, FuriString* args) {
     UNUSED(cli);
     UNUSED(args);
-    furi_hal_power_dump_state();
+    furi_hal_power_debug_get(power_cli_callback, NULL);
 }
 
 void power_cli_5v(Cli* cli, FuriString* args) {

applications/services/rpc/rpc.c

@@ -52,7 +52,12 @@ static RpcSystemCallbacks rpc_systems[] = {
     {
         .alloc = rpc_system_gpio_alloc,
         .free = NULL,
-    }};
+    },
+    {
+        .alloc = rpc_system_property_alloc,
+        .free = NULL,
+    },
+};
 
 struct RpcSession {
     Rpc* rpc;

applications/services/rpc/rpc_app.c

@@ -9,9 +9,15 @@
 
 struct RpcAppSystem {
     RpcSession* session;
+
     RpcAppSystemCallback app_callback;
     void* app_context;
+
+    RpcAppSystemDataExchangeCallback data_exchange_callback;
+    void* data_exchange_context;
+
     PB_Main* state_msg;
+    PB_Main* error_msg;
 
     uint32_t last_id;
     char* last_data;
@@ -195,6 +201,50 @@ static void rpc_system_app_button_release(const PB_Main* request, void* context)
     }
 }
 
+static void rpc_system_app_get_error_process(const PB_Main* request, void* context) {
+    furi_assert(request);
+    furi_assert(request->which_content == PB_Main_app_get_error_request_tag);
+    furi_assert(context);
+
+    RpcAppSystem* rpc_app = context;
+    RpcSession* session = rpc_app->session;
+    furi_assert(session);
+
+    rpc_app->error_msg->command_id = request->command_id;
+
+    FURI_LOG_D(TAG, "GetError");
+    rpc_send(session, rpc_app->error_msg);
+}
+
+static void rpc_system_app_data_exchange_process(const PB_Main* request, void* context) {
+    furi_assert(request);
+    furi_assert(request->which_content == PB_Main_app_data_exchange_request_tag);
+    furi_assert(context);
+
+    RpcAppSystem* rpc_app = context;
+    RpcSession* session = rpc_app->session;
+    furi_assert(session);
+
+    PB_CommandStatus command_status;
+    pb_bytes_array_t* data = request->content.app_data_exchange_request.data;
+
+    if(rpc_app->data_exchange_callback) {
+        uint8_t* data_bytes = NULL;
+        size_t data_size = 0;
+        if(data) {
+            data_bytes = data->bytes;
+            data_size = data->size;
+        }
+        rpc_app->data_exchange_callback(data_bytes, data_size, rpc_app->data_exchange_context);
+        command_status = PB_CommandStatus_OK;
+    } else {
+        command_status = PB_CommandStatus_ERROR_APP_CMD_ERROR;
+    }
+
+    FURI_LOG_D(TAG, "DataExchange");
+    rpc_send_and_release_empty(session, request->command_id, command_status);
+}
+
 void rpc_system_app_send_started(RpcAppSystem* rpc_app) {
     furi_assert(rpc_app);
     RpcSession* session = rpc_app->session;
@@ -259,6 +309,58 @@ void rpc_system_app_set_callback(RpcAppSystem* rpc_app, RpcAppSystemCallback cal
     rpc_app->app_context = ctx;
 }
 
+void rpc_system_app_set_error_code(RpcAppSystem* rpc_app, uint32_t error_code) {
+    furi_assert(rpc_app);
+    PB_App_GetErrorResponse* content = &rpc_app->error_msg->content.app_get_error_response;
+    content->code = error_code;
+}
+
+void rpc_system_app_set_error_text(RpcAppSystem* rpc_app, const char* error_text) {
+    furi_assert(rpc_app);
+    PB_App_GetErrorResponse* content = &rpc_app->error_msg->content.app_get_error_response;
+
+    if(content->text) {
+        free(content->text);
+    }
+
+    content->text = error_text ? strdup(error_text) : NULL;
+}
+
+void rpc_system_app_set_data_exchange_callback(
+    RpcAppSystem* rpc_app,
+    RpcAppSystemDataExchangeCallback callback,
+    void* ctx) {
+    furi_assert(rpc_app);
+
+    rpc_app->data_exchange_callback = callback;
+    rpc_app->data_exchange_context = ctx;
+}
+
+void rpc_system_app_exchange_data(RpcAppSystem* rpc_app, const uint8_t* data, size_t data_size) {
+    furi_assert(rpc_app);
+    RpcSession* session = rpc_app->session;
+    furi_assert(session);
+
+    PB_Main message = {
+        .command_id = 0,
+        .command_status = PB_CommandStatus_OK,
+        .has_next = false,
+        .which_content = PB_Main_app_data_exchange_request_tag,
+    };
+
+    PB_App_DataExchangeRequest* content = &message.content.app_data_exchange_request;
+
+    if(data && data_size) {
+        content->data = malloc(PB_BYTES_ARRAY_T_ALLOCSIZE(data_size));
+        content->data->size = data_size;
+        memcpy(content->data->bytes, data, data_size);
+    } else {
+        content->data = NULL;
+    }
+
+    rpc_send_and_release(session, &message);
+}
+
 void* rpc_system_app_alloc(RpcSession* session) {
     furi_assert(session);
 
@@ -270,6 +372,13 @@ void* rpc_system_app_alloc(RpcSession* session) {
     rpc_app->state_msg->which_content = PB_Main_app_state_response_tag;
     rpc_app->state_msg->command_status = PB_CommandStatus_OK;
 
+    // App error message
+    rpc_app->error_msg = malloc(sizeof(PB_Main));
+    rpc_app->error_msg->which_content = PB_Main_app_get_error_response_tag;
+    rpc_app->error_msg->command_status = PB_CommandStatus_OK;
+    rpc_app->error_msg->content.app_get_error_response.code = 0;
+    rpc_app->error_msg->content.app_get_error_response.text = NULL;
+
     RpcHandler rpc_handler = {
         .message_handler = NULL,
         .decode_submessage = NULL,
@@ -294,6 +403,12 @@ void* rpc_system_app_alloc(RpcSession* session) {
     rpc_handler.message_handler = rpc_system_app_button_release;
     rpc_add_handler(session, PB_Main_app_button_release_request_tag, &rpc_handler);
 
+    rpc_handler.message_handler = rpc_system_app_get_error_process;
+    rpc_add_handler(session, PB_Main_app_get_error_request_tag, &rpc_handler);
+
+    rpc_handler.message_handler = rpc_system_app_data_exchange_process;
+    rpc_add_handler(session, PB_Main_app_data_exchange_request_tag, &rpc_handler);
+
     return rpc_app;
 }
 
@@ -311,8 +426,13 @@ void rpc_system_app_free(void* context) {
         furi_delay_tick(1);
     }
 
+    furi_assert(!rpc_app->data_exchange_callback);
+
     if(rpc_app->last_data) free(rpc_app->last_data);
 
+    pb_release(&PB_Main_msg, rpc_app->error_msg);
+
+    free(rpc_app->error_msg);
     free(rpc_app->state_msg);
     free(rpc_app);
 }

applications/services/rpc/rpc_app.h

@@ -14,6 +14,8 @@ typedef enum {
 } RpcAppSystemEvent;
 
 typedef void (*RpcAppSystemCallback)(RpcAppSystemEvent event, void* context);
+typedef void (
+    *RpcAppSystemDataExchangeCallback)(const uint8_t* data, size_t data_size, void* context);
 
 typedef struct RpcAppSystem RpcAppSystem;
 
@@ -27,6 +29,17 @@ const char* rpc_system_app_get_data(RpcAppSystem* rpc_app);
 
 void rpc_system_app_confirm(RpcAppSystem* rpc_app, RpcAppSystemEvent event, bool result);
 
+void rpc_system_app_set_error_code(RpcAppSystem* rpc_app, uint32_t error_code);
+
+void rpc_system_app_set_error_text(RpcAppSystem* rpc_app, const char* error_text);
+
+void rpc_system_app_set_data_exchange_callback(
+    RpcAppSystem* rpc_app,
+    RpcAppSystemDataExchangeCallback callback,
+    void* ctx);
+
+void rpc_system_app_exchange_data(RpcAppSystem* rpc_app, const uint8_t* data, size_t data_size);
+
 #ifdef __cplusplus
 }
 #endif

applications/services/rpc/rpc_i.h

@@ -34,6 +34,7 @@ void* rpc_system_gui_alloc(RpcSession* session);
 void rpc_system_gui_free(void* ctx);
 void* rpc_system_gpio_alloc(RpcSession* session);
 void rpc_system_gpio_free(void* ctx);
+void* rpc_system_property_alloc(RpcSession* session);
 
 void rpc_debug_print_message(const PB_Main* message);
 void rpc_debug_print_data(const char* prefix, uint8_t* buffer, size_t size);

applications/services/rpc/rpc_property.c

@@ -0,0 +1,107 @@
+#include <flipper.pb.h>
+#include <furi_hal.h>
+#include <furi_hal_info.h>
+#include <furi_hal_power.h>
+#include <core/core_defines.h>
+
+#include "rpc_i.h"
+
+#define TAG "RpcProperty"
+
+#define PROPERTY_CATEGORY_DEVICE_INFO "devinfo"
+#define PROPERTY_CATEGORY_POWER_INFO "pwrinfo"
+#define PROPERTY_CATEGORY_POWER_DEBUG "pwrdebug"
+
+typedef struct {
+    RpcSession* session;
+    PB_Main* response;
+    FuriString* subkey;
+} RpcPropertyContext;
+
+static void
+    rpc_system_property_get_callback(const char* key, const char* value, bool last, void* context) {
+    furi_assert(key);
+    furi_assert(value);
+    furi_assert(context);
+    furi_assert(key);
+    furi_assert(value);
+
+    RpcPropertyContext* ctx = context;
+    RpcSession* session = ctx->session;
+    PB_Main* response = ctx->response;
+
+    if(!strncmp(key, furi_string_get_cstr(ctx->subkey), furi_string_size(ctx->subkey))) {
+        response->content.system_device_info_response.key = strdup(key);
+        response->content.system_device_info_response.value = strdup(value);
+        rpc_send_and_release(session, response);
+    }
+
+    if(last) {
+        rpc_send_and_release_empty(session, response->command_id, PB_CommandStatus_OK);
+    }
+}
+
+static void rpc_system_property_get_process(const PB_Main* request, void* context) {
+    furi_assert(request);
+    furi_assert(request->which_content == PB_Main_property_get_request_tag);
+
+    FURI_LOG_D(TAG, "GetProperty");
+
+    RpcSession* session = (RpcSession*)context;
+    furi_assert(session);
+
+    FuriString* topkey = furi_string_alloc();
+    FuriString* subkey = furi_string_alloc_set_str(request->content.property_get_request.key);
+
+    const size_t sep_idx = furi_string_search_char(subkey, '.');
+
+    if(sep_idx == FURI_STRING_FAILURE) {
+        furi_string_swap(topkey, subkey);
+    } else {
+        furi_string_set_n(topkey, subkey, 0, sep_idx);
+        furi_string_right(subkey, sep_idx + 1);
+    }
+
+    PB_Main* response = malloc(sizeof(PB_Main));
+
+    response->command_id = request->command_id;
+    response->command_status = PB_CommandStatus_OK;
+    response->has_next = true;
+    response->which_content = PB_Main_property_get_response_tag;
+
+    RpcPropertyContext property_context = {
+        .session = session,
+        .response = response,
+        .subkey = subkey,
+    };
+
+    if(!furi_string_cmp(topkey, PROPERTY_CATEGORY_DEVICE_INFO)) {
+        furi_hal_info_get(rpc_system_property_get_callback, '.', &property_context);
+    } else if(!furi_string_cmp(topkey, PROPERTY_CATEGORY_POWER_INFO)) {
+        furi_hal_power_info_get(rpc_system_property_get_callback, '.', &property_context);
+    } else if(!furi_string_cmp(topkey, PROPERTY_CATEGORY_POWER_DEBUG)) {
+        furi_hal_power_debug_get(rpc_system_property_get_callback, &property_context);
+    } else {
+        rpc_send_and_release_empty(
+            session, request->command_id, PB_CommandStatus_ERROR_INVALID_PARAMETERS);
+    }
+
+    furi_string_free(subkey);
+    furi_string_free(topkey);
+
+    free(response);
+}
+
+void* rpc_system_property_alloc(RpcSession* session) {
+    furi_assert(session);
+
+    RpcHandler rpc_handler = {
+        .message_handler = NULL,
+        .decode_submessage = NULL,
+        .context = session,
+    };
+
+    rpc_handler.message_handler = rpc_system_property_get_process;
+    rpc_add_handler(session, PB_Main_property_get_request_tag, &rpc_handler);
+    return NULL;
+}

applications/services/rpc/rpc_system.c

@@ -109,7 +109,7 @@ static void rpc_system_system_device_info_process(const PB_Main* request, void*
         .session = session,
         .response = response,
     };
-    furi_hal_info_get(rpc_system_system_device_info_callback, &device_info_context);
+    furi_hal_info_get(rpc_system_system_device_info_callback, '_', &device_info_context);
 
     free(response);
 }
@@ -266,7 +266,7 @@ static void rpc_system_system_get_power_info_process(const PB_Main* request, voi
         .session = session,
         .response = response,
     };
-    furi_hal_power_info_get(rpc_system_system_power_info_callback, &power_info_context);
+    furi_hal_power_info_get(rpc_system_system_power_info_callback, '_', &power_info_context);
 
     free(response);
 }