diff --git a/src/system/can_bus.cpp b/src/system/can_bus.cpp
index 7d7b1c6..a382eec 100644
--- a/src/system/can_bus.cpp
+++ b/src/system/can_bus.cpp
@@ -8,7 +8,6 @@
 
 #include <sta/debug/assert.hpp>
 #include <sta/bus/can/subscribable.hpp>
-#include <sta/debug_serial.hpp>
 #include <sta/lang.hpp>
 #include <sta/proto/isotp/transmitter.hpp>
 #include <sta/proto/isotp/receiver.hpp>
@@ -138,74 +137,6 @@ namespace dummy
 
 namespace sta
 {
-	class AlpakaCanBus
-	{
-	public:
-		using SysMsgHandler = void (*)(const CanRxHeader &, const uint8_t *);
-		using DataMsgHandler = void (*)(const IsotpMessage &);
-
-		static const uint8_t FIFO_SYS = 0;
-		static const uint8_t FIFO_DATA = 1;
-
-	public:
-		AlpakaCanBus(CanController * controller, TimeMsFn timeMs, SysMsgHandler sysMsgHandler, DataMsgHandler dataMsgHandler);
-
-
-		/**
-		 * @brief Send system message.
-		 *
-		 * @param msg   Message
-		 */
-		void send(const CanSysMsg & msg);
-
-		/**
-		 * @brief Send data message.
-		 *
-		 * @param msg   Message
-		 */
-		void send(const CanDataMsg & msg);
-
-
-		/**
-		 * @brief Process transmissions.
-		 *
-		 * Call regularly to advance transmission.
-		 */
-		void processTx();
-
-		/**
-		 * @brief Process received CAN messages.
-		 */
-		void processRx();
-
-		/**
-		 * @brief Display ISOTP TX/RX statistics.
-		 */
-		void showStatistics();
-
-	private:
-		/**
-		 * @brief Configure CAN filters.
-		 */
-		void setupSubscriptions();
-
-		/**
-		 * @brief Handle received data message CAN frames.
-		 *
-		 * @param header    CAN frame header
-		 * @param payload   Payload buffer
-		 */
-		void receiveDataFrame(const CanRxHeader & header, const uint8_t * payload);
-
-	private:
-		CanController * controller_;
-		IsotpTransmitter tx_;
-		IsotpReceiver rx_;
-		SysMsgHandler handleSysMsg_;
-		DataMsgHandler handleDataMsg_;
-	};
-
-
 	AlpakaCanBus::AlpakaCanBus(CanController * controller, TimeMsFn timeMs, SysMsgHandler sysMsgHandler, DataMsgHandler dataMsgHandler)
 		: controller_{controller}, tx_{controller, timeMs}, rx_{controller, timeMs}, handleSysMsg_{sysMsgHandler}, handleDataMsg_{dataMsgHandler}
 	{