Scratch

require "scratchrsc"
class PrintRSC < RSCWatcher
    def on_broadcast(name) # when a broadcast is sent
        puts "broadcast #{name}" # print it to the screen
    end

    def on_sensor_update(name,value) # when a variable or sensor is updated
        puts "#{name} = #{value}" # print the change to the screen
    end

    def broadcast_hello # when the broadcast "hello" is sent, ignore on_broadcast and
        puts "Hello World" # greet the world,
        broadcast "foo" # and send another broadcast
    end
end

watcher = PrintRSC.new # you can provide the host as an argument
watcher.sensor_update "connected", "1"
loop { watcher.handle_command }