+static GSM_Error FBUS_Initialise(char *port_device, char *initlength,
+ GSM_ConnectionType connection,
+ void (*rlp_callback)(RLP_F96Frame *frame));
+
+static int FBUS_SendMessage(u16 message_length, u8 message_type, u8 *buffer);
+static int FBUS_SendFrame(u16 message_length, u8 message_type, u8 *buffer);
+static void FBUS_Terminate(void);
+static void FBUS_RX_StateMachine(unsigned char rx_byte);
+