get the user led settings

lib/sphero.rb

@@ -58,7 +58,13 @@ def heading= h
   end
 
   def rgb r, g, b, persistant = false
-    write Request::RGB.new(@seq, r, g, b, persistant ? 0x01 : 0x00)
+    write Request::SetRGB.new(@seq, r, g, b, persistant ? 0x01 : 0x00)
+  end
+
+  # This retrieves the "user LED color" which is stored in the config block
+  # (which may or may not be actively driven to the RGB LED).
+  def user_led
+    write Request::GetRGB.new(@seq)
   end
 
   # Brightness 0x00 - 0xFF
@@ -106,8 +112,17 @@ def write packet
     p s.ping
   }
 
-  s.heading = 180
-  s.heading = 0
+  trap(:INT) {
+    s.stop
+  }
+
+  s.roll 100, 0
+
+  loop do
+    [0, 180].each do |dir|
+      s.heading = dir
+    end
+  end
 
   #36.times {
   #  i = 10

lib/sphero/request.rb

@@ -75,13 +75,24 @@ def initialize seq, rate
       end
     end
 
-    class RGB < Sphero
+    class SetRGB < Sphero
       def initialize seq, r, g, b, persistant
         super(seq, [r, g, b, persistant])
         @cid = 0x20
       end
     end
 
+    class GetRGB < Sphero
+      def initialize seq
+        super(seq, [])
+        @cid = 0x22
+      end
+
+      def response header, body
+        Response::GetRGB.new header, body
+      end
+    end
+
     class Roll < Sphero
       def initialize seq, speed, heading, delay
         super(seq, [speed, heading, delay])

lib/sphero/response.rb

@@ -78,5 +78,11 @@ def bta
         body.drop(16).slice_before(0x00).first.pack 'C*'
       end
     end
+
+    class GetRGB < Response
+      def r; body[0]; end
+      def g; body[1]; end
+      def b; body[2]; end
+    end
   end
 end