如在串口助手之类的软件输入AT+RST并发送则只是发送文本并不会重启8266；
如果在串口助手中输入以下
AT+RST
（注意有个回车）然后发送，那么就会被8266认为是AT指令
AT+RST
OK
ets Jan 8 2013,rst cause:2, boot mode:(3,7)
load 0x40100000, len 1856, room 16
tail 0
chksum 0x63
load 0x3ffe8000, len 776, room 8
tail 0
chksum 0x02
load 0x3ffe8310, len 552, room 8
tail 0
chksum 0x79
csum 0x79
2nd boot version : 1.5
SPI Speed : 40MHz
SPI Mode : DIO
SPI Flash Size & Map: 8Mbit(512KB+512KB)
jump to run user1 @ 1000
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ready