AP_Scripting: add notify LED get RGB binding and example

libraries/AP_Scripting/examples/get_notify_RGB.lua

@@ -0,0 +1,26 @@
+-- example of getting the current notify LED colour
+
+function update() -- this is the loop which periodically runs
+
+  local r, g, b = LED:get_rgb()
+  gcs:send_text(0, "Notify LED: r: " .. tostring(r) .. ", g: " .. tostring(g) ..", b:" .. tostring(b))
+
+  return update, 1000 -- reschedules the loop
+end
+
+-- make sure Scripting LED is enabled
+local led_parm = param:get('NTF_LED_TYPES')
+if not led_parm then
+  error('Could not find NTF_LED_TYPES param')
+end
+
+if (led_parm & (1 << 10)) == 0 then
+  -- try and enable it
+  if param:set_and_save('NTF_LED_TYPES',led_parm | (1 << 10)) then
+    error('Enabled Notify Scripting LED, please reboot')
+  else
+    error('Could not set NTF_LED_TYPES param')
+  end
+end
+
+return update()

libraries/AP_Scripting/generator/description/bindings.desc

@@ -280,3 +280,8 @@ singleton AP_RPM method get_rpm boolean uint8_t 0 RPM_MAX_INSTANCES float'Null
 include AP_Button/AP_Button.h
 singleton AP_Button alias button
 singleton AP_Button method get_button_state boolean uint8_t 1 AP_BUTTON_NUM_PINS
+
+
+include AP_Notify/ScriptingLED.h
+singleton ScriptingLED alias LED
+singleton ScriptingLED method get_rgb void uint8_t'Ref uint8_t'Ref uint8_t'Ref