Within months of founding the federation we squeezed a partial implementation into the 8-bit AVR microcontroller and programmed it to share remote sensing data from a community garden. github 
See Garden Report
Even composing the page json was a challenge with the limited string handling capabilities of Arduino's bare-bones C++ libraries. We factored every element of the payload into static and dynamic elements, keys and values, and composed these as we wrote into the tcp/ip stack on an ethernet shield.
This is our first example of Federating Foreign Servers.