为啥小米 6 手时不时向服务器传输数据

192.168.137.196 111.13.142.195 HTTP 975 POST /mistats/v2 HTTP/1.1 (application/x-www-form-urlencoded)

Internet Protocol Version 4, Src: 192.168.137.196, Dst: 111.13.142.195

Transmission Control Protocol, Src Port: 53710, Dst Port: 80, Seq: 1, Ack: 1, Len: 921

Hypertext Transfer Protocol
POST /mistats/v2 HTTP/1.1\r\n
Content-Type: application/x-www-form-urlencoded\r\n
User-Agent: Dalvik/2.1.0 (Linux; U; Android 7.1.1; MI 6 MIUI/V9.2.1.0.NCACNEK)\r\n
Host: data.mistat.xiaomi.com\r\n
Connection: Keep-Alive\r\n
Accept-Encoding: gzip\r\n
Content-Length: 665\r\n
\r\n
[Full request URI: http://data.mistat.xiaomi.com/mistats/v2]
[HTTP request 1/1]
[Response in frame: 48]
File Data: 665 bytes

HTML Form URL Encoded: application/x-www-form-urlencoded
Form item: "app_id" = "2882303761517517533"
Form item: "app_key" = "5571751775533"
Form item: "bc" = "S"
Form item: "channel" = "V9-STABLE"
Form item: "device_id" = "EEB8C779567C7F65957AE2489992CDCCA892BBD9"
Form item: "interval" = "-1"
Form item: "mistatv" = "3"
Form item: "policy" = "1"
Form item: "sdk_version" = "1.9.7"
Form item: "sign" = "eb21d692e64b6b1ed7e05b08e33b4bb6"
Form item: "size" = "1"
Form item: "stat_value" = "b220103b97e615a2d0a1b37b8c455ae6eb9d1f9e89a672934e271ae105a4685faf40cd656d17d888ff6d943b96472ba1f4b846d3119f1cdc98a67c0fd4b10fc37c597918d5c5c7e6c458c31d0f50bdac5804479fb94f29d91ebaaec09eaca4ad914f89086400712e83e1
Form item: "version" = "2.0.0.170823"

不知道怎么发图，上面第一行是抓包预览，是从 192.168.137.196 （小米 6 手机）到 111.13.142.195 的 HTTP POST 数据包。下面的一大堆是该包详细数据。

这样的数据传输在发送短信时（自己发自己测试的）尤为频繁。

抓取方法很简单，电脑 WiFi 连接到网络，同时也打开 WiFi 热点。手机连接到 WiFi 热点，Wireshark 抓取 WiFi 热点即可（ HTTPS 数据也可以抓）。有兴趣的朋友也可以自己抓抓看。