rt-thread.git/components/net/at/at_socket, branch v4.0.3

1、web socket请求数据从服务器回来时，服务器会关闭连接，此时AT socket在读取返回的数据时不应该判断socket为连接的状态

2020-11-22T04:36:07Z

2、sal socket在支持多网卡时，sal_getaddrinfo从A网卡获取的地址信息，在sal_freeaddrinfo释放时必须由A网卡进行释放

[at_socket] update AT_SW_VERSION and adjust at_socket_ops

2020-07-22T17:13:48Z

[at_socket] support alloc socket dynamically with at device

2020-07-20T16:29:12Z

[AT] Adjust where the AT socket callback function

2020-05-19T17:11:46Z

fixed some typos

2020-05-09T02:33:36Z

fix at_socket.c

2019-09-07T03:47:15Z

修改at_socket.c文件中的sendto函数，len局部变量没有给初始值

2019-07-26T10:33:33Z

len值如果不给初始值0，到最后__exit的时候，result = len会导致result的值变成一个不可预估的值，进而导致mbedtls库的while循环无法正常结束，其中mebedtls中发生异常的地方在ssl_tls.c文件中的mbedtls_ssl_flush_output函数while( ssl->out_left > 0 )，因为out_left 是一个无符号整型，退出的条件只能是 out_left = 0,又因为这里面的len没有给初始值0，返回出来的值是一个很大的整型数字，导致了mbedtls中的死循环

[net][sal][netdev] Add IPv6 option configuration and feature support in SAL and netdev

2019-06-24T09:46:18Z

Signed-off-by: chenyong <1521761801@qq.com>

[net][at] Fix socket create failed issue when default netdev mismatch.

2019-05-28T08:25:42Z

Signed-off-by: chenyong <1521761801@qq.com>

[net][at] update AT component V1.3.0, change as follows:

2019-05-27T04:03:04Z

- AT Socket feature supports multi-client connections; - Fix `send data error, current socket (0) state (0) is error` issue when the socket is closed; - Improve dirty data processing when AT device hard reset; - Improve `at_obj_set_urc_table()` fucntion, Support for setting multiple URC tables; - Improve RAW data print format;