From Ethersex Wiki
|menuconfig||Protocols->ECMD (Etherrape Command Interface) support|
Ethersex Command or short ECMD is a simple, text-based protocol to communicate with a device running Ethersex. Using ECMD one can control Ethersex' internal settings like the IP address, change the behavior of modules and even flash the device with a new firmware.
ECMD can be accessed via various transport protocols and busses using a simple abstraction layer. Ethersex provides support for TCP, UDP, I2C, RS232/USART, HTTP and even SMS.