AT指令详解，错误代码详解
转载：https://blog.csdn.net/u011784994/article/details/54603549?utm_source=blogxgwz4&utm_medium=distribute.pc_relevant_download.none-task-blog-baidujs-2.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-baidujs-2
