-void UsbCommandReceived(UsbCommand *UC);
-void CommandReceived(char *Cmd);
-void WaitForResponse(uint32_t response_type);
+extern void UsbCommandReceived(UsbCommand *UC);
+extern int CommandReceived(char *Cmd);
+extern bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout);
+extern bool WaitForResponse(uint32_t cmd, UsbCommand* response);
+extern void clearCommandBuffer();
+extern command_t* getTopLevelCommandTable();