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at_utils.c 对于多client的情况下 send_buf 和last_cmd_len 变量冲突 #22

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@Yohozzy

last_cmd_len = vsnprintf(send_buf, sizeof(send_buf), format, args);

多个client都在通信的情况 接口获取的这两个变量可能是另一个client最近发送的AT指令. 而不是发生错误的的AT指令

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