ESP8266 - A Great Product

In ESP8266 SDK,
Something that interests me:
1) Support RTC.
2) SDK provides several functions to get the time using SNTP protocol.
3) Support SSL (Only allow single client connection only)
The default value of maximum SSL packet size is 2KB.
The maximum size packet can be adjusted.

It is good enough for a single IOT SOC chip (Just HKD 12)...

Then, focus on the SSL, found one more interesting thing...
Someone lists out the object symbols in his blog:)
http://41j.com/blog/2015/01/esp8266-sdk-library-symbols/

Many standardized cryptography algorithms (RSA, SHA1, MD5, AES..) have already provided in the object library files,
but they are not explicitly exposed by the vendor.

In other words, once we disassemble the code,
and trace how the parameters passed in these functions (XTENSA ABI).
Actually, it is not necessary to re-implement the cryptography function (greatly reduce the code size).