it is designed for colleges and students to explore in field of Embedded System & IOT,i admit it doesn't have on chip support for peripherals like RF Ethernet,wifi,
but our main aim to give student knowledge that how thing work
"external ADC is for the mcu like 8051 which doesn't have internal ADC"
"external Ethernet and Bluetooth so we can use mcu of our choice to design the products"
we have ESP8266 board support with pin headers and a 5v Bidirectional logic converter which can be also integrated with out Ethernet chip
Anyway thank for ur precious comments