TAILIEUCHUNG - Software Engineering for Experimental Robotics - Davide Brugali et al Part 11

Tham khảo tài liệu 'software engineering for experimental robotics - davide brugali et al part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | An Integration Framework for Developing Interactive Robots 303 It should be noted here however that the proposed communication framework is not intended for integration of low-level robot control functionalities like . obstacle avoidance. For this task other frameworks described in this Chapter like . Player or Marie are possibly better suited. While these are especially focused on the needs of robotics researchers the XCF SDK is especially designed for supporting the development and integration of high-level functionalities like speech processing and gesture recognition. 4 Lessons Learned Using XCF most of the data flow between all modules in the architecture is event-based and every message is coded in XML. As both data structures and communication channels are name-based the different modules can easily be replaced by others. It also eases modification concerning the data structures used for communication as XML allows database-like exchange of information. Experience in different European research projects showed that the use of XML helped in defining data types which are suitable for every involved project partner. XML objects as native data types allow for a flexible schema evolution and separation of concerns within a system architecture. Additionally generic software modules can much easier be realized within this concept. In the practical use of schemas during prototyping exceptions were encountered frequently. This was often due to misunderstandings between the involved developers about data type definitions but occasionally also serious implementation errors were discovered. For example a module that provided laser range data threw an exception immediately after the start stating that the XML laser data was not valid. Without schema checking being active the module started and seemed to operate correctly the transmitted XML data looked correct and even the communication worked fine. Only after a more detailed analysis it was found that at startup .

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