Now I made an all-in-one RTL8710 prototyping board.

RTL8710 has a 17-digital IO and all of them are accessible through Arduino IDE, after setting environment. Also it has I2C and SPI interface and together with WiFi capability, we can easily make "IoT thing".!! I quickly check "LED blink" and "OLED drive" and "WiFi access" by some demo program, which actual operation can be found in the following movie... Have fun!