can讲解:
https://blog.csdn.net/leverett/article/details/7460964?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~first_rank_v2~rank_v28-8-7460964.nonecase&utm_term=can调试命令%20linux&spm=1000.2123.3001.4430