Instruction in English is followed by Chinese.
Smartlink 用于在物理网设备没有外部输入端时，使用手机对其进行配置的一种通用的说法。
Smartlink is a generic phrase when you configure your IoT devices by mobile phone, PC etc. instead of physical external devices.
在需要使用 smartlink 的地方调用
smartlink_init(callback_func, callback_func_args, callback_failed_func, max_retry);手机端: 设置完成后会调用 (*callback_func)(callback_func_args)，连接失败则会调用 (*callback_failed_func)(callback_func_args)
使用手机手动添加一个Wi-Fi网络，ssid为 ssid<!-SL-!>password,确定的几乎一瞬间 8266 就会收到并且开始配置。
SDK 版本: 0.9.4 by Espressif
Call smartlink_init(callback_func, callback_func_args, callback_failed_func, max_retry); when you want to use Smarklink to configure.
callback_func: callback function when connect target successfully.
callback_func_args: arguments of success callback function.
callback_failed_func: callback function when fail to connect target.
max_retry: maximiun number of retry.
Mobile: Add a ssid named ssid<!-SL-!>password manually, 8266 will receive this request almost immediately and finish configuration.
SDK Version: 0.9.4 by Espressif
Probe Request 包的 tagged parameter 字段是不加密的，这个字段中的 ssid 可以每次最大传送 32 字节的数据。
tagged parameter in Probe Request packet is not encrypted, we can reuse this area to send data to our IoT devices.
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Copyright (c) 2014 latyas
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