root/rt-thread @ b1415c4fc8e47bbfd39dd3009a5df39b04937a4c

HUST_lxq 69e5b10e31 [at_socket.c] Fix null pointer vulnerability caused by the variable at_sock (#7166)		2 lat temu
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at_socket.c	69e5b10e31 [at_socket.c] Fix null pointer vulnerability caused by the variable at_sock (#7166)	2 lat temu
at_socket.h	cca2f40ae0 [add] implement about "AT server".	3 lat temu