diff --git a/CMakeLists.txt b/CMakeLists.txt
index e24e090..ec06ef8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ target_sources(app PRIVATE
   src/ble_adv_uuid16.c
   src/ble_bas_module.c
   src/ble_hid_module.c
-  src/ble_serial_module.c
+  src/ble_nus_module.c
   src/display_module.c
   src/encoder_module.c
   src/hid_flowctrl_module.c
@@ -35,15 +35,11 @@ target_sources(app PRIVATE
   src/led_strip_module.c
   src/time_sync_module.c
   src/ui/ui_main.c
-  src/cdc_wrapper_module.c
   src/protocol_module.c
   src/usb_cdc_module.c
   src/usb_device_module.c
   src/usb_hid_module.c
   src/events/bat_state_event.c
-  src/events/ble_serial_rx_event.c
-  src/events/ble_serial_tx_event.c
-  src/events/cdc_proto_tx_event.c
   src/events/datetime_event.c
   src/events/encoder_event.c
   src/events/function_bitmap_update_event.c
@@ -56,10 +52,10 @@ target_sources(app PRIVATE
   src/mode_switch_module.c
   src/events/keyboard_hid_report_event.c
   src/events/mode_switch_event.c
+  src/events/proto_rx_event.c
+  src/events/proto_tx_event.c
   src/events/set_protocol_event.c
   src/events/theme_rgb_update_event.c
   src/events/time_sync_event.c
-  src/events/usb_cdc_rx_event.c
-  src/events/usb_cdc_tx_event.c
   src/events/usb_state_event.c
 )
diff --git a/inc/cdc_wrapper_module.h b/inc/cdc_wrapper_module.h
deleted file mode 100644
index f024ebe..0000000
--- a/inc/cdc_wrapper_module.h
+++ /dev/null
@@ -1,12 +0,0 @@
-#ifndef BLINKY_CDC_WRAPPER_MODULE_H_
-#define BLINKY_CDC_WRAPPER_MODULE_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_CDC_WRAPPER_MODULE_H_ */
diff --git a/inc/events/ble_serial_rx_event.h b/inc/events/ble_serial_rx_event.h
deleted file mode 100644
index 3b2204d..0000000
--- a/inc/events/ble_serial_rx_event.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef BLINKY_BLE_SERIAL_RX_EVENT_H_
-#define BLINKY_BLE_SERIAL_RX_EVENT_H_
-
-#include <errno.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-#include <app_event_manager_profiler_tracer.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct ble_serial_rx_event {
-	struct app_event_header header;
-	struct event_dyndata dyndata;
-};
-
-APP_EVENT_TYPE_DYNDATA_DECLARE(ble_serial_rx_event);
-
-static inline int submit_ble_serial_rx_event(const uint8_t *data, size_t len)
-{
-	struct ble_serial_rx_event *event;
-
-	if ((data == NULL) && (len > 0U)) {
-		return -EINVAL;
-	}
-
-	event = new_ble_serial_rx_event(len);
-	if (len > 0U) {
-		memcpy(event->dyndata.data, data, len);
-	}
-
-	APP_EVENT_SUBMIT(event);
-	return 0;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_BLE_SERIAL_RX_EVENT_H_ */
diff --git a/inc/events/ble_serial_tx_event.h b/inc/events/ble_serial_tx_event.h
deleted file mode 100644
index 93cac48..0000000
--- a/inc/events/ble_serial_tx_event.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef BLINKY_BLE_SERIAL_TX_EVENT_H_
-#define BLINKY_BLE_SERIAL_TX_EVENT_H_
-
-#include <errno.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-#include <app_event_manager_profiler_tracer.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct ble_serial_tx_event {
-	struct app_event_header header;
-	struct event_dyndata dyndata;
-};
-
-APP_EVENT_TYPE_DYNDATA_DECLARE(ble_serial_tx_event);
-
-static inline int submit_ble_serial_tx_event(const uint8_t *data, size_t len)
-{
-	struct ble_serial_tx_event *event;
-
-	if ((data == NULL) && (len > 0U)) {
-		return -EINVAL;
-	}
-
-	event = new_ble_serial_tx_event(len);
-	if (len > 0U) {
-		memcpy(event->dyndata.data, data, len);
-	}
-
-	APP_EVENT_SUBMIT(event);
-	return 0;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_BLE_SERIAL_TX_EVENT_H_ */
diff --git a/inc/events/cdc_proto_tx_event.h b/inc/events/cdc_proto_tx_event.h
deleted file mode 100644
index 68b7d14..0000000
--- a/inc/events/cdc_proto_tx_event.h
+++ /dev/null
@@ -1,46 +0,0 @@
-#ifndef BLINKY_CDC_PROTO_TX_EVENT_H_
-#define BLINKY_CDC_PROTO_TX_EVENT_H_
-
-#include <errno.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-#include <app_event_manager_profiler_tracer.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct cdc_proto_tx_event {
-	struct app_event_header header;
-	uint8_t type;
-	struct event_dyndata dyndata;
-};
-
-APP_EVENT_TYPE_DYNDATA_DECLARE(cdc_proto_tx_event);
-
-static inline int submit_cdc_proto_tx_event(uint8_t type, const uint8_t *payload,
-					    size_t payload_len)
-{
-	struct cdc_proto_tx_event *event;
-
-	if ((payload == NULL) && (payload_len > 0U)) {
-		return -EINVAL;
-	}
-
-	event = new_cdc_proto_tx_event(payload_len);
-	event->type = type;
-	if (payload_len > 0U) {
-		memcpy(event->dyndata.data, payload, payload_len);
-	}
-
-	APP_EVENT_SUBMIT(event);
-	return 0;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_CDC_PROTO_TX_EVENT_H_ */
diff --git a/inc/events/proto_common.h b/inc/events/proto_common.h
new file mode 100644
index 0000000..479e851
--- /dev/null
+++ b/inc/events/proto_common.h
@@ -0,0 +1,18 @@
+#ifndef BLINKY_PROTO_COMMON_H_
+#define BLINKY_PROTO_COMMON_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum proto_transport {
+	PROTO_TRANSPORT_USB_CDC = 0,
+	PROTO_TRANSPORT_BLE_NUS,
+	PROTO_TRANSPORT_COUNT,
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BLINKY_PROTO_COMMON_H_ */
diff --git a/inc/events/proto_rx_event.h b/inc/events/proto_rx_event.h
new file mode 100644
index 0000000..394674f
--- /dev/null
+++ b/inc/events/proto_rx_event.h
@@ -0,0 +1,50 @@
+#ifndef BLINKY_PROTO_RX_EVENT_H_
+#define BLINKY_PROTO_RX_EVENT_H_
+
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <app_event_manager.h>
+#include <app_event_manager_profiler_tracer.h>
+
+#include "proto_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct proto_rx_event {
+	struct app_event_header header;
+	enum proto_transport transport;
+	struct event_dyndata dyndata;
+};
+
+APP_EVENT_TYPE_DYNDATA_DECLARE(proto_rx_event);
+
+static inline int submit_proto_rx_event(enum proto_transport transport,
+					const uint8_t *data, size_t len)
+{
+	struct proto_rx_event *event;
+
+	if ((transport >= PROTO_TRANSPORT_COUNT) ||
+	    ((data == NULL) && (len > 0U))) {
+		return -EINVAL;
+	}
+
+	event = new_proto_rx_event(len);
+	event->transport = transport;
+
+	if (len > 0U) {
+		memcpy(event->dyndata.data, data, len);
+	}
+
+	APP_EVENT_SUBMIT(event);
+	return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BLINKY_PROTO_RX_EVENT_H_ */
diff --git a/inc/events/proto_tx_event.h b/inc/events/proto_tx_event.h
new file mode 100644
index 0000000..8010ae5
--- /dev/null
+++ b/inc/events/proto_tx_event.h
@@ -0,0 +1,50 @@
+#ifndef BLINKY_PROTO_TX_EVENT_H_
+#define BLINKY_PROTO_TX_EVENT_H_
+
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <app_event_manager.h>
+#include <app_event_manager_profiler_tracer.h>
+
+#include "proto_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct proto_tx_event {
+	struct app_event_header header;
+	enum proto_transport transport;
+	struct event_dyndata dyndata;
+};
+
+APP_EVENT_TYPE_DYNDATA_DECLARE(proto_tx_event);
+
+static inline int submit_proto_tx_event(enum proto_transport transport,
+					const uint8_t *data, size_t len)
+{
+	struct proto_tx_event *event;
+
+	if ((transport >= PROTO_TRANSPORT_COUNT) ||
+	    ((data == NULL) && (len > 0U))) {
+		return -EINVAL;
+	}
+
+	event = new_proto_tx_event(len);
+	event->transport = transport;
+
+	if (len > 0U) {
+		memcpy(event->dyndata.data, data, len);
+	}
+
+	APP_EVENT_SUBMIT(event);
+	return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BLINKY_PROTO_TX_EVENT_H_ */
diff --git a/inc/events/usb_cdc_rx_event.h b/inc/events/usb_cdc_rx_event.h
deleted file mode 100644
index dd981e9..0000000
--- a/inc/events/usb_cdc_rx_event.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef BLINKY_USB_CDC_RX_EVENT_H_
-#define BLINKY_USB_CDC_RX_EVENT_H_
-
-#include <errno.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-#include <app_event_manager_profiler_tracer.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct usb_cdc_rx_event {
-	struct app_event_header header;
-	struct event_dyndata dyndata;
-};
-
-APP_EVENT_TYPE_DYNDATA_DECLARE(usb_cdc_rx_event);
-
-static inline int submit_usb_cdc_rx_event(const uint8_t *data, size_t len)
-{
-	struct usb_cdc_rx_event *event;
-
-	if ((data == NULL) && (len > 0U)) {
-		return -EINVAL;
-	}
-
-	event = new_usb_cdc_rx_event(len);
-	if (len > 0U) {
-		memcpy(event->dyndata.data, data, len);
-	}
-
-	APP_EVENT_SUBMIT(event);
-	return 0;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_USB_CDC_RX_EVENT_H_ */
diff --git a/inc/events/usb_cdc_tx_event.h b/inc/events/usb_cdc_tx_event.h
deleted file mode 100644
index 5ad457c..0000000
--- a/inc/events/usb_cdc_tx_event.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef BLINKY_USB_CDC_TX_EVENT_H_
-#define BLINKY_USB_CDC_TX_EVENT_H_
-
-#include <errno.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-#include <app_event_manager_profiler_tracer.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct usb_cdc_tx_event {
-	struct app_event_header header;
-	struct event_dyndata dyndata;
-};
-
-APP_EVENT_TYPE_DYNDATA_DECLARE(usb_cdc_tx_event);
-
-static inline int submit_usb_cdc_tx_event(const uint8_t *data, size_t len)
-{
-	struct usb_cdc_tx_event *event;
-
-	if ((data == NULL) && (len > 0U)) {
-		return -EINVAL;
-	}
-
-	event = new_usb_cdc_tx_event(len);
-	if (len > 0U) {
-		memcpy(event->dyndata.data, data, len);
-	}
-
-	APP_EVENT_SUBMIT(event);
-	return 0;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_USB_CDC_TX_EVENT_H_ */
diff --git a/inc/protocol_module.h b/inc/protocol_module.h
index e6c1238..437acb8 100644
--- a/inc/protocol_module.h
+++ b/inc/protocol_module.h
@@ -1,30 +1,24 @@
 #ifndef BLINKY_PROTOCOL_MODULE_H_
 #define BLINKY_PROTOCOL_MODULE_H_
 
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 
+#include "proto_common.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#define CDC_PROTO_TYPE_HELLO_REQ 0x01U
-#define CDC_PROTO_TYPE_HELLO_RSP 0x02U
-#define CDC_PROTO_TYPE_BITMAP 0x10U
-#define CDC_PROTO_TYPE_FUNCTION_KEY_EVENT 0x20U
-#define CDC_PROTO_TYPE_LED_STATE 0x21U
-#define CDC_PROTO_TYPE_TIME_SYNC 0x30U
-#define CDC_PROTO_TYPE_THEME_RGB 0x31U
-#define CDC_PROTO_TYPE_ACK 0x7EU
-#define CDC_PROTO_TYPE_ERROR 0x7FU
+int protocol_module_process_message(enum proto_transport transport,
+				    const uint8_t *req_payload,
+				    size_t req_payload_len,
+				    uint8_t *rsp_payload,
+				    size_t rsp_payload_buf_size,
+				    size_t *rsp_payload_len);
 
-int protocol_module_process_cdc_packet(uint8_t req_type,
-				       const uint8_t *req_payload,
-				       size_t req_payload_len,
-				       uint8_t *rsp_type,
-				       uint8_t *rsp_payload,
-				       size_t rsp_payload_buf_size,
-				       size_t *rsp_payload_len);
+void protocol_module_reset_transport_state(enum proto_transport transport);
 
 #ifdef __cplusplus
 }
diff --git a/inc/usb_device_module.h b/inc/usb_device_module.h
deleted file mode 100644
index 549e803..0000000
--- a/inc/usb_device_module.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef BLINKY_USB_DEVICE_MODULE_H_
-#define BLINKY_USB_DEVICE_MODULE_H_
-
-#include <stdbool.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-enum usb_function {
-	USB_FUNCTION_HID = 0x01,
-	USB_FUNCTION_CDC_ACM = 0x02,
-};
-
-enum usb_device_state {
-	USB_DEVICE_STATE_DISCONNECTED,
-	USB_DEVICE_STATE_POWERED,
-	USB_DEVICE_STATE_ACTIVE,
-	USB_DEVICE_STATE_SUSPENDED,
-};
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BLINKY_USB_DEVICE_MODULE_H_ */
diff --git a/prj.conf b/prj.conf
index ea70a72..aee3568 100644
--- a/prj.conf
+++ b/prj.conf
@@ -45,6 +45,7 @@ CONFIG_CDC_ACM_SERIAL_INITIALIZE_AT_BOOT=n
 # BLE
 CONFIG_BT=y
 CONFIG_BT_PERIPHERAL=y
+CONFIG_BT_ZEPHYR_NUS=y
 CONFIG_BT_SMP=y
 CONFIG_BT_BONDABLE=y
 CONFIG_BT_SETTINGS=y
diff --git a/src/ble_nus_module.c b/src/ble_nus_module.c
new file mode 100644
index 0000000..7972dfd
--- /dev/null
+++ b/src/ble_nus_module.c
@@ -0,0 +1,215 @@
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <app_event_manager.h>
+
+#define MODULE ble_nus_module
+#include <caf/events/module_state_event.h>
+#include <caf/events/power_event.h>
+
+#include <caf/events/ble_common_event.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/services/nus.h>
+#include <zephyr/logging/log.h>
+
+#include "proto_rx_event.h"
+#include "proto_tx_event.h"
+#include "protocol_module.h"
+
+LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
+
+static struct bt_conn *active_conn;
+static bool initialized;
+static bool running;
+static bool ble_ready;
+static bool tx_notify_enabled;
+
+static void notif_enabled(bool enabled, void *ctx)
+{
+	ARG_UNUSED(ctx);
+
+	tx_notify_enabled = enabled;
+	LOG_INF("BLE NUS TX notify %s", enabled ? "enabled" : "disabled");
+}
+
+static void received(struct bt_conn *conn, const void *data, uint16_t len, void *ctx)
+{
+	ARG_UNUSED(ctx);
+
+	if (!running || !ble_ready || (conn != active_conn)) {
+		return;
+	}
+
+	(void)submit_proto_rx_event(PROTO_TRANSPORT_BLE_NUS, data, len);
+}
+
+static struct bt_nus_cb nus_listener = {
+	.notif_enabled = notif_enabled,
+	.received = received,
+};
+
+static void reset_connection_state(void)
+{
+	active_conn = NULL;
+	tx_notify_enabled = false;
+	protocol_module_reset_transport_state(PROTO_TRANSPORT_BLE_NUS);
+}
+
+static int module_init(void)
+{
+	int err;
+
+	err = bt_nus_cb_register(&nus_listener, NULL);
+	if (err) {
+		LOG_ERR("bt_nus_cb_register failed (%d)", err);
+		return err;
+	}
+
+	reset_connection_state();
+	return 0;
+}
+
+static int module_start(void)
+{
+	if (running) {
+		return 0;
+	}
+
+	running = true;
+	return 0;
+}
+
+static void module_pause(void)
+{
+	if (!running) {
+		return;
+	}
+
+	running = false;
+	tx_notify_enabled = false;
+}
+
+static bool handle_ble_peer_event(const struct ble_peer_event *event)
+{
+	switch (event->state) {
+	case PEER_STATE_CONNECTED:
+		if (active_conn != NULL) {
+			return false;
+		}
+
+		active_conn = event->id;
+		tx_notify_enabled = false;
+		protocol_module_reset_transport_state(PROTO_TRANSPORT_BLE_NUS);
+		return false;
+
+	case PEER_STATE_DISCONNECTED:
+		if (active_conn != event->id) {
+			return false;
+		}
+
+		reset_connection_state();
+		return false;
+
+	default:
+		return false;
+	}
+}
+
+static bool handle_proto_tx_event(const struct proto_tx_event *event)
+{
+	int err;
+
+	if (event->transport != PROTO_TRANSPORT_BLE_NUS) {
+		return false;
+	}
+
+	if (!running || !ble_ready || (active_conn == NULL) || !tx_notify_enabled) {
+		return false;
+	}
+
+	err = bt_nus_send(active_conn, event->dyndata.data, (uint16_t)event->dyndata.size);
+	if (err) {
+		LOG_WRN("bt_nus_send failed (%d)", err);
+	}
+
+	return false;
+}
+
+static bool app_event_handler(const struct app_event_header *aeh)
+{
+	if (is_proto_tx_event(aeh)) {
+		return handle_proto_tx_event(cast_proto_tx_event(aeh));
+	}
+
+	if (is_ble_peer_event(aeh)) {
+		return handle_ble_peer_event(cast_ble_peer_event(aeh));
+	}
+
+	if (is_module_state_event(aeh)) {
+		const struct module_state_event *event = cast_module_state_event(aeh);
+		int err;
+
+		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
+			if (!initialized) {
+				err = module_init();
+				if (err) {
+					module_set_state(MODULE_STATE_ERROR);
+					return false;
+				}
+
+				initialized = true;
+			}
+
+			err = module_start();
+			if (err) {
+				module_set_state(MODULE_STATE_ERROR);
+			}
+
+			return false;
+		}
+
+		if (check_state(event, MODULE_ID(ble_state), MODULE_STATE_READY)) {
+			ble_ready = true;
+			if (running) {
+				module_set_state(MODULE_STATE_READY);
+			}
+
+			return false;
+		}
+
+		return false;
+	}
+
+	if (is_power_down_event(aeh)) {
+		if (initialized) {
+			module_pause();
+			module_set_state(MODULE_STATE_STANDBY);
+		}
+
+		return false;
+	}
+
+	if (is_wake_up_event(aeh)) {
+		if (initialized) {
+			int err = module_start();
+
+			if (err) {
+				module_set_state(MODULE_STATE_ERROR);
+			} else if (ble_ready) {
+				module_set_state(MODULE_STATE_READY);
+			}
+		}
+
+		return false;
+	}
+
+	return false;
+}
+
+APP_EVENT_LISTENER(MODULE, app_event_handler);
+APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
+APP_EVENT_SUBSCRIBE(MODULE, proto_tx_event);
+APP_EVENT_SUBSCRIBE_EARLY(MODULE, ble_peer_event);
+APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
+APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);
diff --git a/src/ble_serial_module.c b/src/ble_serial_module.c
deleted file mode 100644
index 32604e7..0000000
--- a/src/ble_serial_module.c
+++ /dev/null
@@ -1,300 +0,0 @@
-#include <errno.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-
-#define MODULE ble_serial_module
-#include <caf/events/module_state_event.h>
-#include <caf/events/power_event.h>
-
-#include <caf/events/ble_common_event.h>
-#include <zephyr/bluetooth/att.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/gatt.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/logging/log.h>
-
-#include "ble_serial_rx_event.h"
-#include "ble_serial_tx_event.h"
-
-LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
-
-#define BLE_SERIAL_RX_MAX_LEN 64U
-#define BLE_SERIAL_MIN_PAYLOAD_LEN 32U
-#define BLE_SERIAL_NOTIFY_OVERHEAD 3U
-#define BLE_SERIAL_SERVICE_UUID_VAL \
-	BT_UUID_128_ENCODE(0x0b7f6000, 0x38d2, 0x4f62, 0x8f6f, 0x36c4fd73a110)
-#define BLE_SERIAL_RX_UUID_VAL \
-	BT_UUID_128_ENCODE(0x0b7f6001, 0x38d2, 0x4f62, 0x8f6f, 0x36c4fd73a110)
-#define BLE_SERIAL_TX_UUID_VAL \
-	BT_UUID_128_ENCODE(0x0b7f6002, 0x38d2, 0x4f62, 0x8f6f, 0x36c4fd73a110)
-
-static struct bt_conn *active_conn;
-static bool initialized;
-static bool running;
-static bool ble_ready;
-static bool secured;
-static bool tx_notify_enabled;
-
-static const struct bt_uuid_128 ble_serial_service_uuid =
-	BT_UUID_INIT_128(BLE_SERIAL_SERVICE_UUID_VAL);
-static const struct bt_uuid_128 ble_serial_rx_uuid =
-	BT_UUID_INIT_128(BLE_SERIAL_RX_UUID_VAL);
-static const struct bt_uuid_128 ble_serial_tx_uuid =
-	BT_UUID_INIT_128(BLE_SERIAL_TX_UUID_VAL);
-
-static void tx_ccc_cfg_changed(const struct bt_gatt_attr *attr, uint16_t value)
-{
-	ARG_UNUSED(attr);
-
-	tx_notify_enabled = (value == BT_GATT_CCC_NOTIFY);
-	LOG_INF("BLE serial TX notify %s", tx_notify_enabled ? "enabled" : "disabled");
-}
-
-static ssize_t rx_write_handler(struct bt_conn *conn,
-				const struct bt_gatt_attr *attr,
-				const void *buf,
-				uint16_t len,
-				uint16_t offset,
-				uint8_t flags)
-{
-	ARG_UNUSED(attr);
-	ARG_UNUSED(flags);
-
-	if (!running || !ble_ready || !secured || (conn != active_conn)) {
-		return BT_GATT_ERR(BT_ATT_ERR_WRITE_REQ_REJECTED);
-	}
-
-	if (offset != 0U) {
-		return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
-	}
-
-	if ((buf == NULL) || (len == 0U) || (len > BLE_SERIAL_RX_MAX_LEN)) {
-		return BT_GATT_ERR(BT_ATT_ERR_INVALID_ATTRIBUTE_LEN);
-	}
-
-	(void)submit_ble_serial_rx_event(buf, len);
-	return len;
-}
-
-BT_GATT_SERVICE_DEFINE(ble_serial_svc,
-	BT_GATT_PRIMARY_SERVICE(&ble_serial_service_uuid.uuid),
-	BT_GATT_CHARACTERISTIC(&ble_serial_rx_uuid.uuid,
-			       BT_GATT_CHRC_WRITE | BT_GATT_CHRC_WRITE_WITHOUT_RESP,
-			       BT_GATT_PERM_WRITE_ENCRYPT,
-			       NULL, rx_write_handler, NULL),
-	BT_GATT_CHARACTERISTIC(&ble_serial_tx_uuid.uuid,
-			       BT_GATT_CHRC_NOTIFY,
-			       BT_GATT_PERM_NONE,
-			       NULL, NULL, NULL),
-	BT_GATT_CCC(tx_ccc_cfg_changed,
-		    BT_GATT_PERM_READ | BT_GATT_PERM_WRITE_ENCRYPT)
-);
-
-static void mtu_updated(struct bt_conn *conn, uint16_t tx, uint16_t rx)
-{
-	if (conn != active_conn) {
-		return;
-	}
-
-	LOG_INF("BLE serial MTU updated tx:%u rx:%u", tx, rx);
-}
-
-static struct bt_gatt_cb gatt_callbacks = {
-	.att_mtu_updated = mtu_updated,
-};
-
-static size_t notify_payload_max(void)
-{
-	uint16_t mtu;
-
-	if (active_conn == NULL) {
-		return 0U;
-	}
-
-	mtu = bt_gatt_get_mtu(active_conn);
-	if (mtu <= BLE_SERIAL_NOTIFY_OVERHEAD) {
-		return 0U;
-	}
-
-	return (size_t)(mtu - BLE_SERIAL_NOTIFY_OVERHEAD);
-}
-
-static void reset_connection_state(void)
-{
-	active_conn = NULL;
-	secured = false;
-	tx_notify_enabled = false;
-}
-
-static int module_init(void)
-{
-	bt_gatt_cb_register(&gatt_callbacks);
-	reset_connection_state();
-	return 0;
-}
-
-static int module_start(void)
-{
-	if (running) {
-		return 0;
-	}
-
-	running = true;
-	return 0;
-}
-
-static void module_pause(void)
-{
-	if (!running) {
-		return;
-	}
-
-	running = false;
-	tx_notify_enabled = false;
-}
-
-static bool handle_ble_peer_event(const struct ble_peer_event *event)
-{
-	switch (event->state) {
-	case PEER_STATE_CONNECTED:
-		if (active_conn != NULL) {
-			return false;
-		}
-
-		active_conn = event->id;
-		secured = false;
-		tx_notify_enabled = false;
-		return false;
-
-	case PEER_STATE_SECURED:
-		if (active_conn != event->id) {
-			return false;
-		}
-
-		secured = true;
-		return false;
-
-	case PEER_STATE_DISCONNECTED:
-		if (active_conn != event->id) {
-			return false;
-		}
-
-		reset_connection_state();
-		return false;
-
-	default:
-		return false;
-	}
-}
-
-static bool handle_ble_serial_tx_event(const struct ble_serial_tx_event *event)
-{
-	size_t payload_max;
-	int err;
-
-	if (!running || !ble_ready || (active_conn == NULL) || !secured || !tx_notify_enabled) {
-		return false;
-	}
-
-	payload_max = notify_payload_max();
-	if (payload_max < BLE_SERIAL_MIN_PAYLOAD_LEN) {
-		LOG_WRN("BLE serial MTU payload too small:%u", (uint32_t)payload_max);
-		return false;
-	}
-
-	if (event->dyndata.size > payload_max) {
-		LOG_WRN("BLE serial TX too large len:%u max:%u",
-			(uint32_t)event->dyndata.size, (uint32_t)payload_max);
-		return false;
-	}
-
-	err = bt_gatt_notify(active_conn, &ble_serial_svc.attrs[4],
-			     event->dyndata.data,
-			     (uint16_t)event->dyndata.size);
-	if (err) {
-		LOG_WRN("bt_gatt_notify failed (%d)", err);
-	}
-
-	return false;
-}
-
-static bool app_event_handler(const struct app_event_header *aeh)
-{
-	if (is_ble_serial_tx_event(aeh)) {
-		return handle_ble_serial_tx_event(cast_ble_serial_tx_event(aeh));
-	}
-
-	if (is_ble_peer_event(aeh)) {
-		return handle_ble_peer_event(cast_ble_peer_event(aeh));
-	}
-
-	if (is_module_state_event(aeh)) {
-		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
-
-		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			}
-
-			return false;
-		}
-
-		if (check_state(event, MODULE_ID(ble_state), MODULE_STATE_READY)) {
-			ble_ready = true;
-			if (running) {
-				module_set_state(MODULE_STATE_READY);
-			}
-
-			return false;
-		}
-
-		return false;
-	}
-
-	if (is_power_down_event(aeh)) {
-		if (initialized) {
-			module_pause();
-			module_set_state(MODULE_STATE_STANDBY);
-		}
-
-		return false;
-	}
-
-	if (is_wake_up_event(aeh)) {
-		if (initialized) {
-			int err = module_start();
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else if (ble_ready) {
-				module_set_state(MODULE_STATE_READY);
-			}
-		}
-
-		return false;
-	}
-
-	return false;
-}
-
-APP_EVENT_LISTENER(MODULE, app_event_handler);
-APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
-APP_EVENT_SUBSCRIBE(MODULE, ble_serial_tx_event);
-APP_EVENT_SUBSCRIBE_EARLY(MODULE, ble_peer_event);
-APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
-APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);
diff --git a/src/cdc_wrapper_module.c b/src/cdc_wrapper_module.c
deleted file mode 100644
index 7bcd813..0000000
--- a/src/cdc_wrapper_module.c
+++ /dev/null
@@ -1,298 +0,0 @@
-#include <errno.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <string.h>
-
-#include <app_event_manager.h>
-
-#define MODULE cdc_wrapper_module
-#include <caf/events/module_state_event.h>
-#include <caf/events/power_event.h>
-
-#include <zephyr/logging/log.h>
-
-#include "cdc_proto_tx_event.h"
-#include "protocol_module.h"
-#include "usb_cdc_rx_event.h"
-#include "usb_cdc_tx_event.h"
-
-LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
-
-#define CDC_WRAPPER_HEAD1 0xAAU
-#define CDC_WRAPPER_HEAD2 0x55U
-#define CDC_WRAPPER_MAX_PAYLOAD_LEN 64U
-#define CDC_WRAPPER_MAX_FRAME_LEN (2U + 1U + 1U + CDC_WRAPPER_MAX_PAYLOAD_LEN + 1U)
-
-enum frame_parse_state {
-	FRAME_PARSE_HEAD1,
-	FRAME_PARSE_HEAD2,
-	FRAME_PARSE_LEN,
-	FRAME_PARSE_TYPE,
-	FRAME_PARSE_PAYLOAD,
-	FRAME_PARSE_CHECKSUM,
-};
-
-struct cdc_frame_parser {
-	enum frame_parse_state state;
-	uint8_t len;
-	uint8_t type;
-	uint8_t checksum;
-	uint8_t payload[CDC_WRAPPER_MAX_PAYLOAD_LEN];
-	size_t payload_pos;
-};
-
-static bool initialized;
-static bool running;
-static struct cdc_frame_parser parser;
-
-static void parser_reset(void)
-{
-	parser.state = FRAME_PARSE_HEAD1;
-	parser.len = 0U;
-	parser.type = 0U;
-	parser.checksum = 0U;
-	parser.payload_pos = 0U;
-}
-
-static uint8_t frame_checksum(uint8_t len, uint8_t type,
-			      const uint8_t *payload, size_t payload_len)
-{
-	uint8_t checksum = CDC_WRAPPER_HEAD1 ^ CDC_WRAPPER_HEAD2 ^ len ^ type;
-
-	for (size_t i = 0; i < payload_len; i++) {
-		checksum ^= payload[i];
-	}
-
-	return checksum;
-}
-
-static void submit_tx_frame(uint8_t type, const uint8_t *payload, size_t payload_len)
-{
-	size_t frame_len = 2U + 1U + 1U + payload_len + 1U;
-	uint8_t frame_buf[CDC_WRAPPER_MAX_FRAME_LEN];
-
-	frame_buf[0] = CDC_WRAPPER_HEAD1;
-	frame_buf[1] = CDC_WRAPPER_HEAD2;
-	frame_buf[2] = (uint8_t)payload_len;
-	frame_buf[3] = type;
-	memcpy(&frame_buf[4], payload, payload_len);
-	frame_buf[4U + payload_len] =
-		frame_checksum((uint8_t)payload_len, type, payload, payload_len);
-	(void)submit_usb_cdc_tx_event(frame_buf, frame_len);
-}
-
-static void process_complete_frame(void)
-{
-	uint8_t rsp_type;
-	uint8_t rsp_payload[CDC_WRAPPER_MAX_PAYLOAD_LEN];
-	size_t rsp_payload_len = 0U;
-	int err;
-
-	err = protocol_module_process_cdc_packet(parser.type,
-						 parser.payload,
-						 parser.payload_pos,
-						 &rsp_type,
-						 rsp_payload,
-						 sizeof(rsp_payload),
-						 &rsp_payload_len);
-	if (err == -ENOTSUP) {
-		LOG_WRN("Ignore unsupported CDC packet type:0x%02x", parser.type);
-		return;
-	}
-
-	if (err) {
-		LOG_WRN("Protocol processing failed (%d)", err);
-		return;
-	}
-
-	LOG_INF("CDC response type:0x%02x len:%u",
-		rsp_type, (uint32_t)rsp_payload_len);
-	submit_tx_frame(rsp_type, rsp_payload, rsp_payload_len);
-}
-
-static void consume_byte(uint8_t byte)
-{
-	switch (parser.state) {
-	case FRAME_PARSE_HEAD1:
-		if (byte == CDC_WRAPPER_HEAD1) {
-			parser.state = FRAME_PARSE_HEAD2;
-		}
-		break;
-
-	case FRAME_PARSE_HEAD2:
-		if (byte == CDC_WRAPPER_HEAD2) {
-			parser.state = FRAME_PARSE_LEN;
-		} else if (byte != CDC_WRAPPER_HEAD1) {
-			parser.state = FRAME_PARSE_HEAD1;
-		}
-		break;
-
-	case FRAME_PARSE_LEN:
-		if (byte > CDC_WRAPPER_MAX_PAYLOAD_LEN) {
-			LOG_WRN("Drop CDC frame with invalid len:%u", byte);
-			parser_reset();
-			break;
-		}
-
-		parser.len = byte;
-		parser.payload_pos = 0U;
-		parser.state = FRAME_PARSE_TYPE;
-		break;
-
-	case FRAME_PARSE_TYPE:
-		parser.type = byte;
-		parser.state = (parser.len == 0U) ? FRAME_PARSE_CHECKSUM :
-						 FRAME_PARSE_PAYLOAD;
-		break;
-
-	case FRAME_PARSE_PAYLOAD:
-		parser.payload[parser.payload_pos++] = byte;
-		if (parser.payload_pos >= parser.len) {
-			parser.state = FRAME_PARSE_CHECKSUM;
-		}
-		break;
-
-	case FRAME_PARSE_CHECKSUM:
-		if (byte != frame_checksum(parser.len, parser.type,
-					       parser.payload, parser.payload_pos)) {
-			LOG_WRN("Drop CDC frame with invalid checksum");
-			parser_reset();
-			break;
-		}
-
-		process_complete_frame();
-		parser_reset();
-		break;
-
-	default:
-		parser_reset();
-		break;
-	}
-}
-
-static bool handle_usb_cdc_rx_event(const struct usb_cdc_rx_event *event)
-{
-	if (!running) {
-		return false;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		consume_byte(event->dyndata.data[i]);
-	}
-
-	return false;
-}
-
-static bool handle_cdc_proto_tx_event(const struct cdc_proto_tx_event *event)
-{
-	if (!running) {
-		return false;
-	}
-
-	if (event->dyndata.size > CDC_WRAPPER_MAX_PAYLOAD_LEN) {
-		LOG_WRN("Drop CDC proto TX len:%u max:%u",
-			(uint32_t)event->dyndata.size,
-			(uint32_t)CDC_WRAPPER_MAX_PAYLOAD_LEN);
-		return false;
-	}
-
-	submit_tx_frame(event->type, event->dyndata.data, event->dyndata.size);
-	return false;
-}
-
-static int module_init(void)
-{
-	parser_reset();
-	return 0;
-}
-
-static int module_start(void)
-{
-	if (running) {
-		return 0;
-	}
-
-	running = true;
-	return 0;
-}
-
-static void module_pause(void)
-{
-	if (!running) {
-		return;
-	}
-
-	running = false;
-	parser_reset();
-}
-
-static bool app_event_handler(const struct app_event_header *aeh)
-{
-	if (is_usb_cdc_rx_event(aeh)) {
-		return handle_usb_cdc_rx_event(cast_usb_cdc_rx_event(aeh));
-	}
-
-	if (is_cdc_proto_tx_event(aeh)) {
-		return handle_cdc_proto_tx_event(cast_cdc_proto_tx_event(aeh));
-	}
-
-	if (is_module_state_event(aeh)) {
-		const struct module_state_event *event = cast_module_state_event(aeh);
-
-		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
-		}
-
-		return false;
-	}
-
-	if (is_power_down_event(aeh)) {
-		if (initialized) {
-			module_pause();
-			module_set_state(MODULE_STATE_STANDBY);
-		}
-
-		return false;
-	}
-
-	if (is_wake_up_event(aeh)) {
-		if (initialized) {
-			int err = module_start();
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
-		}
-
-		return false;
-	}
-
-	return false;
-}
-
-APP_EVENT_LISTENER(MODULE, app_event_handler);
-APP_EVENT_SUBSCRIBE(MODULE, cdc_proto_tx_event);
-APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
-APP_EVENT_SUBSCRIBE(MODULE, usb_cdc_rx_event);
-APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
-APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);
diff --git a/src/events/ble_serial_rx_event.c b/src/events/ble_serial_rx_event.c
deleted file mode 100644
index 10a0b2d..0000000
--- a/src/events/ble_serial_rx_event.c
+++ /dev/null
@@ -1,73 +0,0 @@
-#include <ctype.h>
-#include <stdio.h>
-
-#include "ble_serial_rx_event.h"
-
-#define BLE_SERIAL_RX_EVENT_LOG_BUF_LEN 384
-
-static void log_ble_serial_rx_event(const struct app_event_header *aeh)
-{
-	const struct ble_serial_rx_event *event = cast_ble_serial_rx_event(aeh);
-	char log_buf[BLE_SERIAL_RX_EVENT_LOG_BUF_LEN];
-	int pos;
-
-	pos = snprintf(log_buf, sizeof(log_buf), "len:%zu ascii:\"",
-		       event->dyndata.size);
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "log message preparation failure");
-		return;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		int tmp = snprintf(&log_buf[pos], sizeof(log_buf) - pos, "%c",
-				   isprint(event->dyndata.data[i]) ?
-					   event->dyndata.data[i] : '.');
-
-		if ((tmp < 0) || ((pos + tmp) >= sizeof(log_buf))) {
-			APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-					      event->dyndata.size);
-			return;
-		}
-
-		pos += tmp;
-	}
-
-	pos += snprintf(&log_buf[pos], sizeof(log_buf) - pos, "\" hex:");
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-				      event->dyndata.size);
-		return;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		int tmp = snprintf(&log_buf[pos], sizeof(log_buf) - pos, " %02x",
-				   event->dyndata.data[i]);
-
-		if ((tmp < 0) || ((pos + tmp) >= sizeof(log_buf))) {
-			break;
-		}
-
-		pos += tmp;
-	}
-
-	APP_EVENT_MANAGER_LOG(aeh, "%s", log_buf);
-}
-
-static void profile_ble_serial_rx_event(struct log_event_buf *buf,
-					const struct app_event_header *aeh)
-{
-	const struct ble_serial_rx_event *event = cast_ble_serial_rx_event(aeh);
-
-	nrf_profiler_log_encode_uint8(buf, (uint8_t)event->dyndata.size);
-}
-
-APP_EVENT_INFO_DEFINE(ble_serial_rx_event,
-		      ENCODE(NRF_PROFILER_ARG_U8),
-		      ENCODE("len"),
-		      profile_ble_serial_rx_event);
-
-APP_EVENT_TYPE_DEFINE(ble_serial_rx_event,
-		      log_ble_serial_rx_event,
-		      &ble_serial_rx_event_info,
-		      APP_EVENT_FLAGS_CREATE(
-			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/events/ble_serial_tx_event.c b/src/events/ble_serial_tx_event.c
deleted file mode 100644
index 8e75ae6..0000000
--- a/src/events/ble_serial_tx_event.c
+++ /dev/null
@@ -1,62 +0,0 @@
-#include <ctype.h>
-#include <stdio.h>
-
-#include "ble_serial_tx_event.h"
-
-#define BLE_SERIAL_TX_EVENT_LOG_BUF_LEN 256
-
-static void log_ble_serial_tx_event(const struct app_event_header *aeh)
-{
-	const struct ble_serial_tx_event *event = cast_ble_serial_tx_event(aeh);
-	char log_buf[BLE_SERIAL_TX_EVENT_LOG_BUF_LEN];
-	int pos;
-
-	pos = snprintf(log_buf, sizeof(log_buf), "len:%zu ascii:\"",
-		       event->dyndata.size);
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "log message preparation failure");
-		return;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		int tmp = snprintf(&log_buf[pos], sizeof(log_buf) - pos, "%c",
-				   isprint(event->dyndata.data[i]) ?
-					   event->dyndata.data[i] : '.');
-
-		if ((tmp < 0) || ((pos + tmp) >= sizeof(log_buf))) {
-			APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-					      event->dyndata.size);
-			return;
-		}
-
-		pos += tmp;
-	}
-
-	pos += snprintf(&log_buf[pos], sizeof(log_buf) - pos, "\"");
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-				      event->dyndata.size);
-		return;
-	}
-
-	APP_EVENT_MANAGER_LOG(aeh, "%s", log_buf);
-}
-
-static void profile_ble_serial_tx_event(struct log_event_buf *buf,
-					const struct app_event_header *aeh)
-{
-	const struct ble_serial_tx_event *event = cast_ble_serial_tx_event(aeh);
-
-	nrf_profiler_log_encode_uint8(buf, (uint8_t)event->dyndata.size);
-}
-
-APP_EVENT_INFO_DEFINE(ble_serial_tx_event,
-		      ENCODE(NRF_PROFILER_ARG_U8),
-		      ENCODE("len"),
-		      profile_ble_serial_tx_event);
-
-APP_EVENT_TYPE_DEFINE(ble_serial_tx_event,
-		      log_ble_serial_tx_event,
-		      &ble_serial_tx_event_info,
-		      APP_EVENT_FLAGS_CREATE(
-			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/events/cdc_proto_tx_event.c b/src/events/cdc_proto_tx_event.c
deleted file mode 100644
index e1dcffe..0000000
--- a/src/events/cdc_proto_tx_event.c
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "cdc_proto_tx_event.h"
-
-static void log_cdc_proto_tx_event(const struct app_event_header *aeh)
-{
-	const struct cdc_proto_tx_event *event = cast_cdc_proto_tx_event(aeh);
-
-	APP_EVENT_MANAGER_LOG(aeh, "type:0x%02x len:%zu",
-			      event->type, event->dyndata.size);
-}
-
-static void profile_cdc_proto_tx_event(struct log_event_buf *buf,
-				       const struct app_event_header *aeh)
-{
-	const struct cdc_proto_tx_event *event = cast_cdc_proto_tx_event(aeh);
-
-	nrf_profiler_log_encode_uint8(buf, event->type);
-	nrf_profiler_log_encode_uint8(buf, (uint8_t)event->dyndata.size);
-}
-
-APP_EVENT_INFO_DEFINE(cdc_proto_tx_event,
-		      ENCODE(NRF_PROFILER_ARG_U8, NRF_PROFILER_ARG_U8),
-		      ENCODE("type", "len"),
-		      profile_cdc_proto_tx_event);
-
-APP_EVENT_TYPE_DEFINE(cdc_proto_tx_event,
-		      log_cdc_proto_tx_event,
-		      &cdc_proto_tx_event_info,
-		      APP_EVENT_FLAGS_CREATE(
-			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/events/proto_rx_event.c b/src/events/proto_rx_event.c
new file mode 100644
index 0000000..6e090f4
--- /dev/null
+++ b/src/events/proto_rx_event.c
@@ -0,0 +1,42 @@
+#include "proto_rx_event.h"
+
+static const char *transport_name(enum proto_transport transport)
+{
+	switch (transport) {
+	case PROTO_TRANSPORT_USB_CDC:
+		return "usb_cdc";
+	case PROTO_TRANSPORT_BLE_NUS:
+		return "ble_nus";
+	default:
+		return "?";
+	}
+}
+
+static void log_proto_rx_event(const struct app_event_header *aeh)
+{
+	const struct proto_rx_event *event = cast_proto_rx_event(aeh);
+
+	APP_EVENT_MANAGER_LOG(aeh, "transport:%s len:%zu",
+			      transport_name(event->transport),
+			      event->dyndata.size);
+}
+
+static void profile_proto_rx_event(struct log_event_buf *buf,
+				   const struct app_event_header *aeh)
+{
+	const struct proto_rx_event *event = cast_proto_rx_event(aeh);
+
+	nrf_profiler_log_encode_uint8(buf, event->transport);
+	nrf_profiler_log_encode_uint16(buf, (uint16_t)event->dyndata.size);
+}
+
+APP_EVENT_INFO_DEFINE(proto_rx_event,
+		      ENCODE(NRF_PROFILER_ARG_U8, NRF_PROFILER_ARG_U16),
+		      ENCODE("transport", "len"),
+		      profile_proto_rx_event);
+
+APP_EVENT_TYPE_DEFINE(proto_rx_event,
+		      log_proto_rx_event,
+		      &proto_rx_event_info,
+		      APP_EVENT_FLAGS_CREATE(
+			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/events/proto_tx_event.c b/src/events/proto_tx_event.c
new file mode 100644
index 0000000..5ef5a13
--- /dev/null
+++ b/src/events/proto_tx_event.c
@@ -0,0 +1,42 @@
+#include "proto_tx_event.h"
+
+static const char *transport_name(enum proto_transport transport)
+{
+	switch (transport) {
+	case PROTO_TRANSPORT_USB_CDC:
+		return "usb_cdc";
+	case PROTO_TRANSPORT_BLE_NUS:
+		return "ble_nus";
+	default:
+		return "?";
+	}
+}
+
+static void log_proto_tx_event(const struct app_event_header *aeh)
+{
+	const struct proto_tx_event *event = cast_proto_tx_event(aeh);
+
+	APP_EVENT_MANAGER_LOG(aeh, "transport:%s len:%zu",
+			      transport_name(event->transport),
+			      event->dyndata.size);
+}
+
+static void profile_proto_tx_event(struct log_event_buf *buf,
+				   const struct app_event_header *aeh)
+{
+	const struct proto_tx_event *event = cast_proto_tx_event(aeh);
+
+	nrf_profiler_log_encode_uint8(buf, event->transport);
+	nrf_profiler_log_encode_uint16(buf, (uint16_t)event->dyndata.size);
+}
+
+APP_EVENT_INFO_DEFINE(proto_tx_event,
+		      ENCODE(NRF_PROFILER_ARG_U8, NRF_PROFILER_ARG_U16),
+		      ENCODE("transport", "len"),
+		      profile_proto_tx_event);
+
+APP_EVENT_TYPE_DEFINE(proto_tx_event,
+		      log_proto_tx_event,
+		      &proto_tx_event_info,
+		      APP_EVENT_FLAGS_CREATE(
+			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/events/usb_cdc_rx_event.c b/src/events/usb_cdc_rx_event.c
deleted file mode 100644
index a941afe..0000000
--- a/src/events/usb_cdc_rx_event.c
+++ /dev/null
@@ -1,73 +0,0 @@
-#include <ctype.h>
-#include <stdio.h>
-
-#include "usb_cdc_rx_event.h"
-
-#define USB_CDC_RX_EVENT_LOG_BUF_LEN 384
-
-static void log_usb_cdc_rx_event(const struct app_event_header *aeh)
-{
-	const struct usb_cdc_rx_event *event = cast_usb_cdc_rx_event(aeh);
-	char log_buf[USB_CDC_RX_EVENT_LOG_BUF_LEN];
-	int pos;
-
-	pos = snprintf(log_buf, sizeof(log_buf), "len:%zu ascii:\"",
-		       event->dyndata.size);
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "log message preparation failure");
-		return;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		int tmp = snprintf(&log_buf[pos], sizeof(log_buf) - pos, "%c",
-				   isprint(event->dyndata.data[i]) ?
-					   event->dyndata.data[i] : '.');
-
-		if ((tmp < 0) || ((pos + tmp) >= sizeof(log_buf))) {
-			APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-					      event->dyndata.size);
-			return;
-		}
-
-		pos += tmp;
-	}
-
-	pos += snprintf(&log_buf[pos], sizeof(log_buf) - pos, "\" hex:");
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-				      event->dyndata.size);
-		return;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		int tmp = snprintf(&log_buf[pos], sizeof(log_buf) - pos, " %02x",
-				   event->dyndata.data[i]);
-
-		if ((tmp < 0) || ((pos + tmp) >= sizeof(log_buf))) {
-			break;
-		}
-
-		pos += tmp;
-	}
-
-	APP_EVENT_MANAGER_LOG(aeh, "%s", log_buf);
-}
-
-static void profile_usb_cdc_rx_event(struct log_event_buf *buf,
-				     const struct app_event_header *aeh)
-{
-	const struct usb_cdc_rx_event *event = cast_usb_cdc_rx_event(aeh);
-
-	nrf_profiler_log_encode_uint8(buf, (uint8_t)event->dyndata.size);
-}
-
-APP_EVENT_INFO_DEFINE(usb_cdc_rx_event,
-		      ENCODE(NRF_PROFILER_ARG_U8),
-		      ENCODE("len"),
-		      profile_usb_cdc_rx_event);
-
-APP_EVENT_TYPE_DEFINE(usb_cdc_rx_event,
-		      log_usb_cdc_rx_event,
-		      &usb_cdc_rx_event_info,
-		      APP_EVENT_FLAGS_CREATE(
-			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/events/usb_cdc_tx_event.c b/src/events/usb_cdc_tx_event.c
deleted file mode 100644
index 8524105..0000000
--- a/src/events/usb_cdc_tx_event.c
+++ /dev/null
@@ -1,62 +0,0 @@
-#include <ctype.h>
-#include <stdio.h>
-
-#include "usb_cdc_tx_event.h"
-
-#define USB_CDC_TX_EVENT_LOG_BUF_LEN 256
-
-static void log_usb_cdc_tx_event(const struct app_event_header *aeh)
-{
-	const struct usb_cdc_tx_event *event = cast_usb_cdc_tx_event(aeh);
-	char log_buf[USB_CDC_TX_EVENT_LOG_BUF_LEN];
-	int pos;
-
-	pos = snprintf(log_buf, sizeof(log_buf), "len:%zu ascii:\"",
-		       event->dyndata.size);
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "log message preparation failure");
-		return;
-	}
-
-	for (size_t i = 0; i < event->dyndata.size; i++) {
-		int tmp = snprintf(&log_buf[pos], sizeof(log_buf) - pos, "%c",
-				   isprint(event->dyndata.data[i]) ?
-					   event->dyndata.data[i] : '.');
-
-		if ((tmp < 0) || ((pos + tmp) >= sizeof(log_buf))) {
-			APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-					      event->dyndata.size);
-			return;
-		}
-
-		pos += tmp;
-	}
-
-	pos += snprintf(&log_buf[pos], sizeof(log_buf) - pos, "\"");
-	if ((pos < 0) || (pos >= sizeof(log_buf))) {
-		APP_EVENT_MANAGER_LOG(aeh, "len:%zu ascii:\"...\"",
-				      event->dyndata.size);
-		return;
-	}
-
-	APP_EVENT_MANAGER_LOG(aeh, "%s", log_buf);
-}
-
-static void profile_usb_cdc_tx_event(struct log_event_buf *buf,
-				     const struct app_event_header *aeh)
-{
-	const struct usb_cdc_tx_event *event = cast_usb_cdc_tx_event(aeh);
-
-	nrf_profiler_log_encode_uint8(buf, (uint8_t)event->dyndata.size);
-}
-
-APP_EVENT_INFO_DEFINE(usb_cdc_tx_event,
-		      ENCODE(NRF_PROFILER_ARG_U8),
-		      ENCODE("len"),
-		      profile_usb_cdc_tx_event);
-
-APP_EVENT_TYPE_DEFINE(usb_cdc_tx_event,
-		      log_usb_cdc_tx_event,
-		      &usb_cdc_tx_event_info,
-		      APP_EVENT_FLAGS_CREATE(
-			      APP_EVENT_TYPE_FLAGS_INIT_LOG_ENABLE));
diff --git a/src/protocol_module.c b/src/protocol_module.c
index 40bf560..e30dc1a 100644
--- a/src/protocol_module.c
+++ b/src/protocol_module.c
@@ -18,14 +18,9 @@
 
 #include <proto/device_comm.pb.h>
 
-#include "theme_rgb_update_event.h"
-#include "time_sync_event.h"
-#include "cdc_proto_tx_event.h"
-#include "function_bitmap_update_event.h"
-#include "hid_led_event.h"
-#include "key_function_event.h"
+#include "proto_rx_event.h"
+#include "proto_tx_event.h"
 #include "protocol_module.h"
-#include "usb_state_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
@@ -34,39 +29,12 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 #define PROTOCOL_PRODUCT_ID 0x52F0U
 #define PROTOCOL_FIRMWARE_MAJOR 0U
 #define PROTOCOL_FIRMWARE_MINOR 0U
-#define PROTOCOL_CAPABILITY_FLAGS (BIT(0) | BIT(1) | BIT(2) | BIT(3))
+#define PROTOCOL_CAPABILITY_FLAGS 0U
+#define PROTOCOL_MAX_MSG_LEN 128U
 
 static bool initialized;
 static bool running;
-static bool keyboard_core_ready;
-static bool usb_active;
-static bool hello_done;
-
-static bool type_matches_body(uint8_t type, const CdcPacketBody *body)
-{
-	switch (type) {
-	case CDC_PROTO_TYPE_HELLO_REQ:
-		return body->which_body == CdcPacketBody_hello_req_tag;
-	case CDC_PROTO_TYPE_HELLO_RSP:
-		return body->which_body == CdcPacketBody_hello_rsp_tag;
-	case CDC_PROTO_TYPE_BITMAP:
-		return body->which_body == CdcPacketBody_bitmap_tag;
-	case CDC_PROTO_TYPE_FUNCTION_KEY_EVENT:
-		return body->which_body == CdcPacketBody_function_key_event_tag;
-	case CDC_PROTO_TYPE_LED_STATE:
-		return body->which_body == CdcPacketBody_led_state_tag;
-	case CDC_PROTO_TYPE_TIME_SYNC:
-		return body->which_body == CdcPacketBody_time_sync_tag;
-	case CDC_PROTO_TYPE_THEME_RGB:
-		return body->which_body == CdcPacketBody_theme_rgb_tag;
-	case CDC_PROTO_TYPE_ACK:
-		return body->which_body == CdcPacketBody_ack_tag;
-	case CDC_PROTO_TYPE_ERROR:
-		return body->which_body == CdcPacketBody_error_tag;
-	default:
-		return false;
-	}
-}
+static bool hello_done[PROTO_TRANSPORT_COUNT];
 
 static int decode_body(const uint8_t *payload, size_t payload_len,
 		       CdcPacketBody *body)
@@ -123,94 +91,12 @@ static int encode_hello_rsp(uint8_t *rsp_payload, size_t rsp_payload_buf_size,
 	return encode_body(&body, rsp_payload, rsp_payload_buf_size, rsp_payload_len);
 }
 
-static int encode_ack(uint8_t acked_type, uint8_t *rsp_payload,
-		      size_t rsp_payload_buf_size, size_t *rsp_payload_len)
-{
-	CdcPacketBody body = CdcPacketBody_init_zero;
-
-	body.which_body = CdcPacketBody_ack_tag;
-	body.body.ack.acked_type = acked_type;
-
-	return encode_body(&body, rsp_payload, rsp_payload_buf_size, rsp_payload_len);
-}
-
-static int encode_error(uint8_t error_type, ErrorCode error_code,
-			uint8_t *rsp_payload, size_t rsp_payload_buf_size,
-			size_t *rsp_payload_len)
-{
-	CdcPacketBody body = CdcPacketBody_init_zero;
-
-	body.which_body = CdcPacketBody_error_tag;
-	body.body.error.error_type = error_type;
-	body.body.error.error_code = error_code;
-
-	return encode_body(&body, rsp_payload, rsp_payload_buf_size, rsp_payload_len);
-}
-
-static int encode_function_key_event(uint16_t usage, uint8_t action,
-				     uint8_t *payload,
-				     size_t payload_buf_size,
-				     size_t *payload_len)
-{
-	CdcPacketBody body = CdcPacketBody_init_zero;
-
-	body.which_body = CdcPacketBody_function_key_event_tag;
-	body.body.function_key_event.usage = usage;
-	body.body.function_key_event.action = (KeyAction)action;
-
-	return encode_body(&body, payload, payload_buf_size, payload_len);
-}
-
-static int encode_led_state(uint32_t led_mask, uint8_t *payload,
-			    size_t payload_buf_size, size_t *payload_len)
-{
-	CdcPacketBody body = CdcPacketBody_init_zero;
-
-	body.which_body = CdcPacketBody_led_state_tag;
-	body.body.led_state.led_mask = led_mask;
-
-	return encode_body(&body, payload, payload_buf_size, payload_len);
-}
-
-static int encode_error_response(uint8_t req_type, ErrorCode error_code,
-				 uint8_t *rsp_type, uint8_t *rsp_payload,
-				 size_t rsp_payload_buf_size,
-				 size_t *rsp_payload_len)
-{
-	int err;
-
-	err = encode_error(req_type, error_code, rsp_payload,
-			   rsp_payload_buf_size, rsp_payload_len);
-	if (err) {
-		return err;
-	}
-
-	*rsp_type = CDC_PROTO_TYPE_ERROR;
-	return 0;
-}
-
-static int encode_ack_response(uint8_t acked_type, uint8_t *rsp_type,
-			       uint8_t *rsp_payload,
-			       size_t rsp_payload_buf_size,
-			       size_t *rsp_payload_len)
-{
-	int err;
-
-	err = encode_ack(acked_type, rsp_payload, rsp_payload_buf_size,
-			 rsp_payload_len);
-	if (err) {
-		return err;
-	}
-
-	*rsp_type = CDC_PROTO_TYPE_ACK;
-	return 0;
-}
-
 static int module_init(void)
 {
-	keyboard_core_ready = false;
-	usb_active = false;
-	hello_done = false;
+	for (size_t i = 0; i < ARRAY_SIZE(hello_done); i++) {
+		hello_done[i] = false;
+	}
+
 	return 0;
 }
 
@@ -230,22 +116,34 @@ static void module_pause(void)
 		return;
 	}
 
-	hello_done = false;
+	for (size_t i = 0; i < ARRAY_SIZE(hello_done); i++) {
+		hello_done[i] = false;
+	}
+
 	running = false;
 }
 
-int protocol_module_process_cdc_packet(uint8_t req_type,
-				       const uint8_t *req_payload,
-				       size_t req_payload_len,
-				       uint8_t *rsp_type,
-				       uint8_t *rsp_payload,
-				       size_t rsp_payload_buf_size,
-				       size_t *rsp_payload_len)
+void protocol_module_reset_transport_state(enum proto_transport transport)
+{
+	if (transport >= PROTO_TRANSPORT_COUNT) {
+		return;
+	}
+
+	hello_done[transport] = false;
+}
+
+int protocol_module_process_message(enum proto_transport transport,
+				    const uint8_t *req_payload,
+				    size_t req_payload_len,
+				    uint8_t *rsp_payload,
+				    size_t rsp_payload_buf_size,
+				    size_t *rsp_payload_len)
 {
 	CdcPacketBody body;
 	int err;
 
-	if ((rsp_type == NULL) || (rsp_payload == NULL) || (rsp_payload_len == NULL)) {
+	if ((transport >= PROTO_TRANSPORT_COUNT) ||
+	    (rsp_payload == NULL) || (rsp_payload_len == NULL)) {
 		return -EINVAL;
 	}
 
@@ -255,191 +153,53 @@ int protocol_module_process_cdc_packet(uint8_t req_type,
 
 	err = decode_body(req_payload, req_payload_len, &body);
 	if (err) {
-		return encode_error_response(req_type, ErrorCode_ERROR_CODE_INVALID_LENGTH,
-					     rsp_type, rsp_payload,
-					     rsp_payload_buf_size, rsp_payload_len);
+		return err;
 	}
 
-	if (!type_matches_body(req_type, &body)) {
-		LOG_WRN("CDC type/body mismatch type:0x%02x body_case:%d",
-			req_type, body.which_body);
-		return encode_error_response(req_type, ErrorCode_ERROR_CODE_INVALID_PARAM,
-					     rsp_type, rsp_payload,
-					     rsp_payload_buf_size, rsp_payload_len);
+	if (body.which_body != CdcPacketBody_hello_req_tag) {
+		LOG_WRN("Unsupported protobuf body case %d", body.which_body);
+		return -ENOTSUP;
 	}
 
-	switch (req_type) {
-	case CDC_PROTO_TYPE_HELLO_REQ:
-		LOG_INF("HelloReq protocol_version:%u",
+	LOG_INF("HelloReq transport:%u protocol_version:%u",
+		transport, body.body.hello_req.protocol_version);
+
+	if (body.body.hello_req.protocol_version != PROTOCOL_VERSION) {
+		LOG_WRN("Unexpected protocol version:%u",
 			body.body.hello_req.protocol_version);
-
-		if (body.body.hello_req.protocol_version != PROTOCOL_VERSION) {
-			LOG_WRN("Unexpected protocol version:%u",
-				body.body.hello_req.protocol_version);
-		}
-
-		hello_done = true;
-		err = encode_hello_rsp(rsp_payload, rsp_payload_buf_size, rsp_payload_len);
-		if (err) {
-			return err;
-		}
-
-		*rsp_type = CDC_PROTO_TYPE_HELLO_RSP;
-		return 0;
-
-	case CDC_PROTO_TYPE_BITMAP:
-		if (!hello_done) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_NOT_READY,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		if (!keyboard_core_ready) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_NOT_READY,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		if (body.body.bitmap.usage_bitmap.size != KEYBOARD_PROTOCOL_BITMAP_BYTES) {
-			LOG_WRN("Bitmap len:%u expected:%u",
-				(unsigned int)body.body.bitmap.usage_bitmap.size,
-				KEYBOARD_PROTOCOL_BITMAP_BYTES);
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_INVALID_LENGTH,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		err = submit_function_bitmap_update_event(
-			body.body.bitmap.usage_bitmap.bytes);
-		if (err) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_INVALID_PARAM,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		return encode_ack_response(req_type, rsp_type, rsp_payload,
-					   rsp_payload_buf_size, rsp_payload_len);
-
-	case CDC_PROTO_TYPE_TIME_SYNC:
-		if (!hello_done) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_NOT_READY,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		if (body.body.time_sync.version != 1U) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_INVALID_PARAM,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		submit_time_sync_event(body.body.time_sync.version,
-				       body.body.time_sync.flags,
-				       body.body.time_sync.timezone_min,
-				       body.body.time_sync.utc_ms,
-				       body.body.time_sync.accuracy_ms);
-		return encode_ack_response(req_type, rsp_type, rsp_payload,
-					   rsp_payload_buf_size, rsp_payload_len);
-
-	case CDC_PROTO_TYPE_THEME_RGB:
-		if (!hello_done) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_NOT_READY,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		if ((body.body.theme_rgb.red > 255U) ||
-		    (body.body.theme_rgb.green > 255U) ||
-		    (body.body.theme_rgb.blue > 255U)) {
-			return encode_error_response(req_type, ErrorCode_ERROR_CODE_INVALID_PARAM,
-						     rsp_type, rsp_payload,
-						     rsp_payload_buf_size,
-						     rsp_payload_len);
-		}
-
-		submit_theme_rgb_update_event((struct theme_rgb) {
-			.r = (uint8_t)body.body.theme_rgb.red,
-			.g = (uint8_t)body.body.theme_rgb.green,
-			.b = (uint8_t)body.body.theme_rgb.blue,
-		});
-		return encode_ack_response(req_type, rsp_type, rsp_payload,
-					   rsp_payload_buf_size, rsp_payload_len);
-
-	default:
-		LOG_WRN("Unsupported CDC protocol type:0x%02x", req_type);
-		return encode_error_response(req_type, ErrorCode_ERROR_CODE_UNKNOWN_TYPE,
-					     rsp_type, rsp_payload,
-					     rsp_payload_buf_size, rsp_payload_len);
 	}
+
+	hello_done[transport] = true;
+	return encode_hello_rsp(rsp_payload, rsp_payload_buf_size, rsp_payload_len);
 }
 
-static bool handle_key_function_event(const struct key_function_event *event)
+static bool handle_proto_rx_event(const struct proto_rx_event *event)
 {
-	uint8_t payload[64];
-	size_t payload_len;
+	uint8_t rsp_payload[PROTOCOL_MAX_MSG_LEN];
+	size_t rsp_payload_len = 0U;
 	int err;
 
-	if (!running || !usb_active || !hello_done) {
+	if (!running) {
 		return false;
 	}
 
-	err = encode_function_key_event(event->usage, event->action, payload,
-					sizeof(payload), &payload_len);
+	err = protocol_module_process_message(event->transport,
+					      event->dyndata.data,
+					      event->dyndata.size,
+					      rsp_payload,
+					      sizeof(rsp_payload),
+					      &rsp_payload_len);
 	if (err) {
-		LOG_WRN("FunctionKeyEvent encode failed (%d)", err);
+		if (err != -ENOTSUP) {
+			LOG_WRN("Protocol processing failed (%d)", err);
+		}
+
 		return false;
 	}
 
-	err = submit_cdc_proto_tx_event(CDC_PROTO_TYPE_FUNCTION_KEY_EVENT,
-					payload, payload_len);
+	err = submit_proto_tx_event(event->transport, rsp_payload, rsp_payload_len);
 	if (err) {
-		LOG_WRN("FunctionKeyEvent submit failed (%d)", err);
-	}
-
-	return false;
-}
-
-static bool handle_hid_led_event(const struct hid_led_event *event)
-{
-	uint8_t payload[64];
-	size_t payload_len;
-	int err;
-
-	if (!running || !usb_active || !hello_done) {
-		return false;
-	}
-
-	err = encode_led_state(event->led_bm, payload, sizeof(payload), &payload_len);
-	if (err) {
-		LOG_WRN("LedState encode failed (%d)", err);
-		return false;
-	}
-
-	err = submit_cdc_proto_tx_event(CDC_PROTO_TYPE_LED_STATE, payload, payload_len);
-	if (err) {
-		LOG_WRN("LedState submit failed (%d)", err);
-	}
-
-	return false;
-}
-
-static bool handle_usb_state_event(const struct usb_state_event *event)
-{
-	if ((event->op != USB_STATE_EVENT_OP_SNAPSHOT) ||
-	    (event->src_module_id != MODULE_ID(usb_device_module))) {
-		return false;
-	}
-
-	usb_active = (event->flags & USB_STATEF_ACTIVE) != 0U;
-	if (!usb_active) {
-		hello_done = false;
+		LOG_WRN("Proto TX submit failed (%d)", err);
 	}
 
 	return false;
@@ -447,16 +207,8 @@ static bool handle_usb_state_event(const struct usb_state_event *event)
 
 static bool app_event_handler(const struct app_event_header *aeh)
 {
-	if (is_key_function_event(aeh)) {
-		return handle_key_function_event(cast_key_function_event(aeh));
-	}
-
-	if (is_hid_led_event(aeh)) {
-		return handle_hid_led_event(cast_hid_led_event(aeh));
-	}
-
-	if (is_usb_state_event(aeh)) {
-		return handle_usb_state_event(cast_usb_state_event(aeh));
+	if (is_proto_rx_event(aeh)) {
+		return handle_proto_rx_event(cast_proto_rx_event(aeh));
 	}
 
 	if (is_module_state_event(aeh)) {
@@ -484,11 +236,6 @@ static bool app_event_handler(const struct app_event_header *aeh)
 			return false;
 		}
 
-		if (check_state(event, MODULE_ID(keyboard_core_module), MODULE_STATE_READY)) {
-			keyboard_core_ready = true;
-			return false;
-		}
-
 		return false;
 	}
 
@@ -519,9 +266,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 }
 
 APP_EVENT_LISTENER(MODULE, app_event_handler);
-APP_EVENT_SUBSCRIBE(MODULE, hid_led_event);
-APP_EVENT_SUBSCRIBE(MODULE, key_function_event);
 APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
-APP_EVENT_SUBSCRIBE(MODULE, usb_state_event);
+APP_EVENT_SUBSCRIBE(MODULE, proto_rx_event);
 APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
 APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);
diff --git a/src/usb_cdc_module.c b/src/usb_cdc_module.c
index 2a1b385..d310578 100644
--- a/src/usb_cdc_module.c
+++ b/src/usb_cdc_module.c
@@ -16,8 +16,9 @@
 #include <zephyr/sys/ring_buffer.h>
 #include <zephyr/sys/util.h>
 
-#include "usb_cdc_rx_event.h"
-#include "usb_cdc_tx_event.h"
+#include "proto_rx_event.h"
+#include "proto_tx_event.h"
+#include "protocol_module.h"
 #include "usb_state_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
@@ -25,7 +26,9 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 #define USB_CDC_RX_RING_BUF_SIZE 256
 #define USB_CDC_TX_RING_BUF_SIZE 256
 #define USB_CDC_RX_CHUNK_SIZE 32
+#define USB_CDC_PROTO_RX_BUF_SIZE 128
 #define USB_CDC_CONTROL_POLL_INTERVAL K_MSEC(100)
+#define USB_CDC_PROTO_RX_FLUSH_DELAY K_MSEC(3)
 #define USB_CDC_EXPECTED_BAUDRATE 115200U
 
 static const struct device *const cdc_dev = DEVICE_DT_GET_ONE(zephyr_cdc_acm_uart);
@@ -36,12 +39,15 @@ static struct ring_buf rx_ringbuf;
 static struct ring_buf tx_ringbuf;
 static struct k_work rx_work;
 static struct k_work_delayable control_work;
+static struct k_work_delayable rx_flush_work;
 static bool initialized;
 static bool running;
 static bool usb_active;
 static bool usb_function_prepared;
 static bool dtr_ready;
 static bool rx_enabled;
+static uint8_t proto_rx_buf[USB_CDC_PROTO_RX_BUF_SIZE];
+static size_t proto_rx_len;
 
 static bool is_usb_owner_snapshot(const struct usb_state_event *event)
 {
@@ -66,6 +72,8 @@ static void disable_uart_io(void)
 	uart_irq_tx_disable(cdc_dev);
 	rx_enabled = false;
 	dtr_ready = false;
+	proto_rx_len = 0U;
+	k_work_cancel_delayable(&rx_flush_work);
 	reset_ring_buffers();
 }
 
@@ -133,10 +141,32 @@ static void rx_work_handler(struct k_work *work)
 			return;
 		}
 
-		(void)submit_usb_cdc_rx_event(buffer, len);
+		if ((proto_rx_len + len) > sizeof(proto_rx_buf)) {
+			LOG_WRN("Drop oversized CDC protobuf message len:%u",
+				(uint32_t)(proto_rx_len + len));
+			proto_rx_len = 0U;
+		}
+
+		if (len > 0U) {
+			memcpy(&proto_rx_buf[proto_rx_len], buffer, len);
+			proto_rx_len += len;
+			k_work_reschedule(&rx_flush_work, USB_CDC_PROTO_RX_FLUSH_DELAY);
+		}
 	}
 }
 
+static void rx_flush_work_handler(struct k_work *work)
+{
+	ARG_UNUSED(work);
+
+	if (!running || !usb_active || !dtr_ready || (proto_rx_len == 0U)) {
+		return;
+	}
+
+	(void)submit_proto_rx_event(PROTO_TRANSPORT_USB_CDC, proto_rx_buf, proto_rx_len);
+	proto_rx_len = 0U;
+}
+
 static void control_work_handler(struct k_work *work)
 {
 	uint32_t dtr = 0U;
@@ -250,8 +280,10 @@ static int module_init(void)
 	reset_ring_buffers();
 	k_work_init(&rx_work, rx_work_handler);
 	k_work_init_delayable(&control_work, control_work_handler);
+	k_work_init_delayable(&rx_flush_work, rx_flush_work_handler);
 	uart_irq_callback_set(cdc_dev, cdc_interrupt_handler);
 	usb_function_prepared = false;
+	proto_rx_len = 0U;
 	return 0;
 }
 
@@ -276,6 +308,7 @@ static void module_pause(void)
 	}
 
 	k_work_cancel_delayable(&control_work);
+	k_work_cancel_delayable(&rx_flush_work);
 	disable_uart_io();
 	running = false;
 }
@@ -304,6 +337,8 @@ static bool handle_usb_state_event(const struct usb_state_event *event)
 
 	if (!usb_active) {
 		k_work_cancel_delayable(&control_work);
+		k_work_cancel_delayable(&rx_flush_work);
+		protocol_module_reset_transport_state(PROTO_TRANSPORT_USB_CDC);
 		disable_uart_io();
 	} else if (running) {
 		k_work_reschedule(&control_work, K_NO_WAIT);
@@ -312,11 +347,15 @@ static bool handle_usb_state_event(const struct usb_state_event *event)
 	return false;
 }
 
-static bool handle_usb_cdc_tx_event(const struct usb_cdc_tx_event *event)
+static bool handle_proto_tx_event(const struct proto_tx_event *event)
 {
 	uint32_t written;
 	unsigned int key;
 
+	if (event->transport != PROTO_TRANSPORT_USB_CDC) {
+		return false;
+	}
+
 	if (!running || !usb_active || !dtr_ready) {
 		return false;
 	}
@@ -343,8 +382,8 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		return handle_usb_state_event(cast_usb_state_event(aeh));
 	}
 
-	if (is_usb_cdc_tx_event(aeh)) {
-		return handle_usb_cdc_tx_event(cast_usb_cdc_tx_event(aeh));
+	if (is_proto_tx_event(aeh)) {
+		return handle_proto_tx_event(cast_proto_tx_event(aeh));
 	}
 
 	if (is_module_state_event(aeh)) {
@@ -402,7 +441,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 APP_EVENT_LISTENER(MODULE, app_event_handler);
 APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
+APP_EVENT_SUBSCRIBE(MODULE, proto_tx_event);
 APP_EVENT_SUBSCRIBE(MODULE, usb_state_event);
-APP_EVENT_SUBSCRIBE(MODULE, usb_cdc_tx_event);
 APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
 APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);