RT-Thread-packages/at_device @ 2.0.4

réplica de https://github-proxy.rt-thread.io/RT-Thread-packages/at_device.git

Meco Man 3742312281 format codes		%!s(int64=4) %!d(string=hai) anos
..
Kconfig	df1d450cdd add n21 n58	%!s(int64=5) %!d(string=hai) anos
at_device_n21.c	46aa9f6e80 fix bug that may cause memory leaks.	%!s(int64=5) %!d(string=hai) anos
at_device_n21.h	3742312281 format codes	%!s(int64=4) %!d(string=hai) anos
at_socket_n21.c	b23e2a845a Add version num judgement in at_socket_ops	%!s(int64=5) %!d(string=hai) anos