diff --git a/c/protocan-transport/CMakeLists.txt b/c/protocan-transport/CMakeLists.txt
index b32a030..baa128c 100644
--- a/c/protocan-transport/CMakeLists.txt
+++ b/c/protocan-transport/CMakeLists.txt
@@ -6,6 +6,7 @@ set(CMAKE_C_STANDARD_REQUIRED ON)
 
 # Ядро библиотеки: платформенных зависимостей нет, собирается под что угодно.
 set(PCAN_CORE_SOURCES
+    src/gui_frame.c
     src/pcan_abi.c
     src/pcan_crc.c
     src/pcan_frame.c
diff --git a/c/protocan-transport/include/pcan_abi.h b/c/protocan-transport/include/pcan_abi.h
index bf395d0..5e1c23a 100644
--- a/c/protocan-transport/include/pcan_abi.h
+++ b/c/protocan-transport/include/pcan_abi.h
@@ -36,6 +36,15 @@ typedef struct {
     uint8_t data[8];
 } pcan_abi_frame_t;
 
+#define PCAN_ABI_GUI_PAYLOAD_MAX 512U
+
+typedef struct {
+    uint16_t sequence;
+    uint16_t size;
+    uint8_t message_type;
+    uint8_t payload[PCAN_ABI_GUI_PAYLOAD_MAX];
+} pcan_abi_gui_frame_t;
+
 PCAN_ABI_API uint32_t pcan_abi_version(void);
 
 PCAN_ABI_API uint32_t pcan_abi_id_pack(uint8_t priority, uint8_t route,
@@ -67,6 +76,21 @@ PCAN_ABI_API int pcan_abi_parser_stats(const void *parser_storage,
                                        uint32_t *bad_length,
                                        uint32_t *stray_bytes);
 
+PCAN_ABI_API uint32_t pcan_abi_gui_crc32(const uint8_t *data, size_t size);
+PCAN_ABI_API size_t pcan_abi_gui_frame_encode(
+    uint8_t message_type, uint16_t sequence,
+    const uint8_t *payload, uint16_t payload_size,
+    uint8_t *output, size_t output_size);
+PCAN_ABI_API size_t pcan_abi_gui_parser_size(void);
+PCAN_ABI_API int pcan_abi_gui_parser_init(void *parser_storage,
+                                          size_t storage_size);
+PCAN_ABI_API int pcan_abi_gui_parser_push(void *parser_storage, uint8_t byte,
+                                          pcan_abi_gui_frame_t *output);
+PCAN_ABI_API int pcan_abi_gui_parser_stats(
+    const void *parser_storage, uint32_t *frames, uint32_t *crc_errors,
+    uint32_t *version_errors, uint32_t *length_errors,
+    uint32_t *stray_bytes);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/c/protocan-transport/ports/android/Android.mk b/c/protocan-transport/ports/android/Android.mk
index 819db94..142285f 100644
--- a/c/protocan-transport/ports/android/Android.mk
+++ b/c/protocan-transport/ports/android/Android.mk
@@ -4,6 +4,7 @@ include $(CLEAR_VARS)
 LOCAL_MODULE := setcore
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../include
 LOCAL_SRC_FILES := \
+    ../../src/gui_frame.c \
     ../../src/pcan_abi.c \
     ../../src/pcan_crc.c \
     ../../src/pcan_frame.c \
diff --git a/c/protocan-transport/ports/android/kotlin/ru/setcorp/setcore/NativeProtoCan.kt b/c/protocan-transport/ports/android/kotlin/ru/setcorp/setcore/NativeProtoCan.kt
index 5dfa233..07cf39f 100644
--- a/c/protocan-transport/ports/android/kotlin/ru/setcorp/setcore/NativeProtoCan.kt
+++ b/c/protocan-transport/ports/android/kotlin/ru/setcorp/setcore/NativeProtoCan.kt
@@ -30,4 +30,13 @@ object NativeProtoCan {
     external fun nativeDestroyParser(handle: Long)
     external fun nativeFeedParser(handle: Long, input: ByteArray): ByteArray?
     external fun nativeParserStats(handle: Long): IntArray?
+    external fun nativeGuiEncode(
+        messageType: Int,
+        sequence: Int,
+        input: ByteArray,
+    ): ByteArray?
+    external fun nativeCreateGuiParser(): Long
+    external fun nativeDestroyGuiParser(handle: Long)
+    external fun nativeFeedGuiParser(handle: Long, input: ByteArray): ByteArray?
+    external fun nativeGuiParserStats(handle: Long): IntArray?
 }
diff --git a/c/protocan-transport/ports/android/setcore_jni.c b/c/protocan-transport/ports/android/setcore_jni.c
index d28fe9c..dbcdff7 100644
--- a/c/protocan-transport/ports/android/setcore_jni.c
+++ b/c/protocan-transport/ports/android/setcore_jni.c
@@ -12,6 +12,11 @@ typedef struct {
     uint32_t sequence_lost;
 } android_parser_t;
 
+typedef struct {
+    uint8_t *storage;
+    size_t storage_size;
+} android_gui_parser_t;
+
 JNIEXPORT jint JNICALL
 Java_ru_setcorp_setcore_NativeProtoCan_nativeAbiVersion(JNIEnv *env, jobject self)
 {
@@ -207,3 +212,106 @@ Java_ru_setcorp_setcore_NativeProtoCan_nativeParserStats(
     }
     return result;
 }
+
+JNIEXPORT jbyteArray JNICALL
+Java_ru_setcorp_setcore_NativeProtoCan_nativeGuiEncode(
+    JNIEnv *env, jobject self, jint message_type, jint sequence,
+    jbyteArray input)
+{
+    (void)self;
+    jsize size = (*env)->GetArrayLength(env, input);
+    if (size > (jsize)PCAN_ABI_GUI_PAYLOAD_MAX) return NULL;
+    jbyte *data = (*env)->GetByteArrayElements(env, input, NULL);
+    uint8_t output[PCAN_ABI_GUI_PAYLOAD_MAX + 12U];
+    size_t written = pcan_abi_gui_frame_encode(
+        (uint8_t)message_type, (uint16_t)sequence, (const uint8_t *)data,
+        (uint16_t)size, output, sizeof output);
+    if (data != NULL) (*env)->ReleaseByteArrayElements(env, input, data, JNI_ABORT);
+    if (written == 0U) return NULL;
+    jbyteArray result = (*env)->NewByteArray(env, (jsize)written);
+    if (result != NULL) {
+        (*env)->SetByteArrayRegion(env, result, 0, (jsize)written,
+                                  (const jbyte *)output);
+    }
+    return result;
+}
+
+JNIEXPORT jlong JNICALL
+Java_ru_setcorp_setcore_NativeProtoCan_nativeCreateGuiParser(JNIEnv *env, jobject self)
+{
+    (void)env; (void)self;
+    android_gui_parser_t *parser = (android_gui_parser_t *)calloc(1U, sizeof *parser);
+    if (parser == NULL) return 0;
+    parser->storage_size = pcan_abi_gui_parser_size();
+    parser->storage = (uint8_t *)malloc(parser->storage_size);
+    if ((parser->storage == NULL) ||
+        !pcan_abi_gui_parser_init(parser->storage, parser->storage_size)) {
+        free(parser->storage); free(parser); return 0;
+    }
+    return (jlong)(intptr_t)parser;
+}
+
+JNIEXPORT void JNICALL
+Java_ru_setcorp_setcore_NativeProtoCan_nativeDestroyGuiParser(
+    JNIEnv *env, jobject self, jlong handle)
+{
+    (void)env; (void)self;
+    android_gui_parser_t *parser = (android_gui_parser_t *)(intptr_t)handle;
+    if (parser != NULL) { free(parser->storage); free(parser); }
+}
+
+/* Records: type[1], sequence LE[2], size LE[2], payload[size]. */
+JNIEXPORT jbyteArray JNICALL
+Java_ru_setcorp_setcore_NativeProtoCan_nativeFeedGuiParser(
+    JNIEnv *env, jobject self, jlong handle, jbyteArray input)
+{
+    (void)self;
+    android_gui_parser_t *parser = (android_gui_parser_t *)(intptr_t)handle;
+    if (parser == NULL) return NULL;
+    jsize size = (*env)->GetArrayLength(env, input);
+    jbyte *data = (*env)->GetByteArrayElements(env, input, NULL);
+    size_t capacity = (size_t)size + ((size_t)size / 12U + 2U) * 5U + 512U;
+    uint8_t *records = (uint8_t *)malloc(capacity);
+    if (records == NULL) {
+        if (data != NULL) (*env)->ReleaseByteArrayElements(env, input, data, JNI_ABORT);
+        return NULL;
+    }
+    size_t used = 0U;
+    pcan_abi_gui_frame_t frame;
+    for (jsize i = 0; i < size; ++i) {
+        if (pcan_abi_gui_parser_push(parser->storage, (uint8_t)data[i], &frame) > 0) {
+            records[used++] = frame.message_type;
+            records[used++] = (uint8_t)frame.sequence;
+            records[used++] = (uint8_t)(frame.sequence >> 8);
+            records[used++] = (uint8_t)frame.size;
+            records[used++] = (uint8_t)(frame.size >> 8);
+            memcpy(&records[used], frame.payload, frame.size);
+            used += frame.size;
+        }
+    }
+    if (data != NULL) (*env)->ReleaseByteArrayElements(env, input, data, JNI_ABORT);
+    jbyteArray result = (*env)->NewByteArray(env, (jsize)used);
+    if ((result != NULL) && (used != 0U)) {
+        (*env)->SetByteArrayRegion(env, result, 0, (jsize)used,
+                                  (const jbyte *)records);
+    }
+    free(records);
+    return result;
+}
+
+JNIEXPORT jintArray JNICALL
+Java_ru_setcorp_setcore_NativeProtoCan_nativeGuiParserStats(
+    JNIEnv *env, jobject self, jlong handle)
+{
+    (void)self;
+    android_gui_parser_t *parser = (android_gui_parser_t *)(intptr_t)handle;
+    if (parser == NULL) return NULL;
+    uint32_t frames = 0U, crc = 0U, version = 0U, length = 0U, stray = 0U;
+    pcan_abi_gui_parser_stats(parser->storage, &frames, &crc, &version,
+                              &length, &stray);
+    jint values[5] = { (jint)frames, (jint)crc, (jint)version,
+                       (jint)length, (jint)stray };
+    jintArray result = (*env)->NewIntArray(env, 5);
+    if (result != NULL) (*env)->SetIntArrayRegion(env, result, 0, 5, values);
+    return result;
+}
diff --git a/c/protocan-transport/src/pcan_abi.c b/c/protocan-transport/src/pcan_abi.c
index 02322a7..55e8293 100644
--- a/c/protocan-transport/src/pcan_abi.c
+++ b/c/protocan-transport/src/pcan_abi.c
@@ -5,6 +5,7 @@
 #include "pcan_crc.h"
 #include "pcan_frame.h"
 #include "pcan_id.h"
+#include "gui_frame.h"
 
 uint32_t pcan_abi_version(void)
 {
@@ -134,3 +135,69 @@ int pcan_abi_parser_stats(const void *parser_storage, uint32_t *frames,
     }
     return 1;
 }
+
+uint32_t pcan_abi_gui_crc32(const uint8_t *data, size_t size)
+{
+    if ((data == NULL) && (size != 0U)) {
+        return 0U;
+    }
+    return gui_crc32(data, size);
+}
+
+size_t pcan_abi_gui_frame_encode(uint8_t message_type, uint16_t sequence,
+                                 const uint8_t *payload,
+                                 uint16_t payload_size, uint8_t *output,
+                                 size_t output_size)
+{
+    return gui_frame_encode(message_type, sequence, payload, payload_size,
+                            output, output_size);
+}
+
+size_t pcan_abi_gui_parser_size(void)
+{
+    return sizeof(gui_parser_t);
+}
+
+int pcan_abi_gui_parser_init(void *parser_storage, size_t storage_size)
+{
+    if ((parser_storage == NULL) || (storage_size < sizeof(gui_parser_t))) {
+        return 0;
+    }
+    gui_parser_init((gui_parser_t *)parser_storage);
+    return 1;
+}
+
+int pcan_abi_gui_parser_push(void *parser_storage, uint8_t byte,
+                             pcan_abi_gui_frame_t *output)
+{
+    gui_frame_t frame;
+    if ((parser_storage == NULL) || (output == NULL)) {
+        return -1;
+    }
+    if (!gui_parser_push((gui_parser_t *)parser_storage, byte, &frame)) {
+        return 0;
+    }
+    output->message_type = frame.type;
+    output->sequence = frame.sequence;
+    output->size = frame.size;
+    if (frame.size != 0U) {
+        memcpy(output->payload, frame.payload, frame.size);
+    }
+    return 1;
+}
+
+int pcan_abi_gui_parser_stats(const void *parser_storage, uint32_t *frames,
+                              uint32_t *crc_errors, uint32_t *version_errors,
+                              uint32_t *length_errors, uint32_t *stray_bytes)
+{
+    const gui_parser_t *parser = (const gui_parser_t *)parser_storage;
+    if (parser == NULL) {
+        return 0;
+    }
+    if (frames != NULL) *frames = parser->stats.frames;
+    if (crc_errors != NULL) *crc_errors = parser->stats.crc_errors;
+    if (version_errors != NULL) *version_errors = parser->stats.version_errors;
+    if (length_errors != NULL) *length_errors = parser->stats.length_errors;
+    if (stray_bytes != NULL) *stray_bytes = parser->stats.stray_bytes;
+    return 1;
+}
diff --git a/c/protocan-transport/tests/test_abi.c b/c/protocan-transport/tests/test_abi.c
index fbde51f..09ce2e0 100644
--- a/c/protocan-transport/tests/test_abi.c
+++ b/c/protocan-transport/tests/test_abi.c
@@ -38,6 +38,37 @@ int main(void)
         (frame.data[0] != 0xAAU) || (frame.data[1] != 0xBBU)) {
         return 4;
     }
+
+    uint8_t gui_raw[32];
+    size_t gui_size = pcan_abi_gui_frame_encode(
+        1U, 0x1234U, NULL, 0U, gui_raw, sizeof gui_raw);
+    static const uint8_t gui_want[] = {
+        0xA5U, 0x5AU, 0x01U, 0x01U, 0x12U, 0x34U, 0x00U, 0x00U,
+        0xEEU, 0x89U, 0x8CU, 0x9EU
+    };
+    if ((gui_size != sizeof gui_want) ||
+        (memcmp(gui_raw, gui_want, sizeof gui_want) != 0)) {
+        return 5;
+    }
+    size_t gui_parser_size = pcan_abi_gui_parser_size();
+    void *gui_parser = malloc(gui_parser_size);
+    pcan_abi_gui_frame_t gui_frame;
+    memset(&gui_frame, 0, sizeof gui_frame);
+    if ((gui_parser == NULL) ||
+        !pcan_abi_gui_parser_init(gui_parser, gui_parser_size)) {
+        free(gui_parser);
+        return 6;
+    }
+    found = 0;
+    for (size_t i = 0U; i < gui_size; ++i) {
+        found += pcan_abi_gui_parser_push(gui_parser, gui_raw[i],
+                                          &gui_frame) > 0;
+    }
+    free(gui_parser);
+    if ((found != 1) || (gui_frame.message_type != 1U) ||
+        (gui_frame.sequence != 0x1234U) || (gui_frame.size != 0U)) {
+        return 7;
+    }
     puts("ABI tests passed");
     return 0;
 }
diff --git a/c/protocan-transport/tools/build_host.py b/c/protocan-transport/tools/build_host.py
index 17a77bf..547b4d5 100644
--- a/c/protocan-transport/tools/build_host.py
+++ b/c/protocan-transport/tools/build_host.py
@@ -19,7 +19,7 @@ ROOT = Path(__file__).resolve().parent.parent
 INCLUDE = ROOT / "include"
 SOURCES = [
     ROOT / "src" / name for name in (
-        "pcan_abi.c", "pcan_crc.c", "pcan_frame.c", "pcan_id.c",
+        "gui_frame.c", "pcan_abi.c", "pcan_crc.c", "pcan_frame.c", "pcan_id.c",
         "pcan_link.c", "pcan_ring.c", "pcan_gas.c",
     )
 ]
diff --git a/python/protocan/__init__.py b/python/protocan/__init__.py
index 44d720a..1dd539a 100644
--- a/python/protocan/__init__.py
+++ b/python/protocan/__init__.py
@@ -1,5 +1,11 @@
 """Переносимые модули ProtoCAN и тонкая обёртка общего C99-ядра."""
 
-from .native import NativeCore, NativeCoreUnavailable, NativeFrame, NativeParser
+from .native import (
+    NativeCore, NativeCoreUnavailable, NativeFrame, NativeGuiFrame,
+    NativeGuiParser, NativeParser,
+)
 
-__all__ = ["NativeCore", "NativeCoreUnavailable", "NativeFrame", "NativeParser"]
+__all__ = [
+    "NativeCore", "NativeCoreUnavailable", "NativeFrame", "NativeGuiFrame",
+    "NativeGuiParser", "NativeParser",
+]
diff --git a/python/protocan/native.py b/python/protocan/native.py
index f5a824e..81ca1c8 100644
--- a/python/protocan/native.py
+++ b/python/protocan/native.py
@@ -28,6 +28,15 @@ class _AbiFrame(ctypes.Structure):
     ]
 
 
+class _AbiGuiFrame(ctypes.Structure):
+    _fields_ = [
+        ("sequence", ctypes.c_uint16),
+        ("size", ctypes.c_uint16),
+        ("message_type", ctypes.c_uint8),
+        ("payload", ctypes.c_uint8 * 512),
+    ]
+
+
 @dataclass(frozen=True)
 class NativeFrame:
     sequence: int
@@ -36,6 +45,13 @@ class NativeFrame:
     data: bytes
 
 
+@dataclass(frozen=True)
+class NativeGuiFrame:
+    message_type: int
+    sequence: int
+    payload: bytes
+
+
 def _library_candidates() -> Iterable[Path | str]:
     explicit = os.environ.get("SETCORE_LIBRARY")
     if explicit:
@@ -108,6 +124,24 @@ class NativeCore:
             ctypes.POINTER(ctypes.c_uint32), ctypes.POINTER(ctypes.c_uint32),
         ]
         lib.pcan_abi_parser_stats.restype = ctypes.c_int
+        lib.pcan_abi_gui_crc32.argtypes = [ctypes.c_void_p, ctypes.c_size_t]
+        lib.pcan_abi_gui_crc32.restype = ctypes.c_uint32
+        lib.pcan_abi_gui_frame_encode.argtypes = [
+            ctypes.c_uint8, ctypes.c_uint16, ctypes.c_void_p, ctypes.c_uint16,
+            ctypes.c_void_p, ctypes.c_size_t,
+        ]
+        lib.pcan_abi_gui_frame_encode.restype = ctypes.c_size_t
+        lib.pcan_abi_gui_parser_size.restype = ctypes.c_size_t
+        lib.pcan_abi_gui_parser_init.argtypes = [ctypes.c_void_p, ctypes.c_size_t]
+        lib.pcan_abi_gui_parser_init.restype = ctypes.c_int
+        lib.pcan_abi_gui_parser_push.argtypes = [
+            ctypes.c_void_p, ctypes.c_uint8, ctypes.POINTER(_AbiGuiFrame),
+        ]
+        lib.pcan_abi_gui_parser_push.restype = ctypes.c_int
+        lib.pcan_abi_gui_parser_stats.argtypes = [
+            ctypes.c_void_p, *(ctypes.POINTER(ctypes.c_uint32) for _ in range(5)),
+        ]
+        lib.pcan_abi_gui_parser_stats.restype = ctypes.c_int
 
     def id_pack(self, priority: int, route: int, device_type: int,
                 device_id: int, message_type: int, body: int) -> int:
@@ -146,6 +180,26 @@ class NativeCore:
     def parser(self) -> "NativeParser":
         return NativeParser(self)
 
+    def gui_crc32(self, data: bytes) -> int:
+        source = (ctypes.c_uint8 * len(data)).from_buffer_copy(data) if data else None
+        return int(self.lib.pcan_abi_gui_crc32(source, len(data)))
+
+    def gui_encode(self, message_type: int, sequence: int,
+                   payload: bytes) -> bytes:
+        if len(payload) > 512:
+            raise ValueError("GUI payload cannot exceed 512 bytes")
+        source = ((ctypes.c_uint8 * len(payload)).from_buffer_copy(payload)
+                  if payload else None)
+        output = (ctypes.c_uint8 * (8 + 512 + 4))()
+        size = int(self.lib.pcan_abi_gui_frame_encode(
+            message_type, sequence, source, len(payload), output, len(output)))
+        if size == 0:
+            raise ValueError("SETCore rejected the GUI frame")
+        return bytes(output[:size])
+
+    def gui_parser(self) -> "NativeGuiParser":
+        return NativeGuiParser(self)
+
 
 class NativeParser:
     def __init__(self, core: NativeCore) -> None:
@@ -182,6 +236,42 @@ class NativeParser:
         }
 
 
+class NativeGuiParser:
+    def __init__(self, core: NativeCore) -> None:
+        self._core = core
+        size = int(core.lib.pcan_abi_gui_parser_size())
+        self._storage = ctypes.create_string_buffer(size)
+        if not core.lib.pcan_abi_gui_parser_init(self._storage, size):
+            raise NativeCoreUnavailable("SETCore GUI parser initialization failed")
+
+    def feed(self, chunk: bytes) -> list[NativeGuiFrame]:
+        frames: list[NativeGuiFrame] = []
+        raw = _AbiGuiFrame()
+        for byte in chunk:
+            result = self._core.lib.pcan_abi_gui_parser_push(
+                self._storage, byte, ctypes.byref(raw))
+            if result < 0:
+                raise NativeCoreUnavailable("SETCore GUI parser rejected its context")
+            if result > 0:
+                frames.append(NativeGuiFrame(
+                    int(raw.message_type), int(raw.sequence),
+                    bytes(raw.payload[:raw.size])))
+        return frames
+
+    def stats(self) -> dict[str, int]:
+        values = [ctypes.c_uint32() for _ in range(5)]
+        if not self._core.lib.pcan_abi_gui_parser_stats(
+                self._storage, *(ctypes.byref(value) for value in values)):
+            raise NativeCoreUnavailable("SETCore GUI parser stats unavailable")
+        return {
+            "frames": values[0].value,
+            "crc_errors": values[1].value,
+            "version_errors": values[2].value,
+            "length_errors": values[3].value,
+            "stray_bytes": values[4].value,
+        }
+
+
 _default_core: NativeCore | None = None