doc speical features of the board

Author: gigapod

docs/assets/img/opreation-led-cmd.png

@@ -0,0 +1,38 @@
+# Additional Functionality
+
+## Sending Data to the IOT Node - LoRaWAN board
+
+To demonstrate the ability to send commands to the IoT Node - LoRaWAN board, the firmware implements some simple commands to change the on-board RGB LED of the device. While simple, the commands demonstrate the flexibility of this functionality.
+
+### General Command Structure
+
+The LED command structure consist of a set of Hex (number) codes sent to the target SparkFun IoT Node - LoRaWAN board via port 2 of the LoRaWAN connection. 
+
+And example of this in the Digi XON control panel for a IoT Node - LoRaWAN device is shown in the following image:
+
+![LED command](assets/img/opreation-led-cmd.png)
+
+This sends the command code **0x01FF0000**, which turns on the on-board LED and sets the color red. Note - the port value is set to 2. 
+
+Command codes have the following general structure:
+
+**[Command Code - 1 byte][RGB Color - 3 bytes]**
+
+The available command codes:
+
+|Code| Payload | Description |
+|--|--|--|
+|01|RGB value | Turn on the LED, set to the provided RGB value|
+|02| <none> | Turn off the LED|
+|03|RGB Value | Blink the LED using the provided RGB value|
+|04|RGB Value | Fast blink the LED using the provided RGB value|
+|05| Brightness | Set the brightness of the LED - a 1 byte value: 0 - 255|
+
+## Button Events
+
+The SparkFun IoT Node - LoRaWAN board has a "user button". When pressed, the button will perform the following actions:
+
+|Type| Description|
+|--|--|
+|Momentary Press|When the button is momentary pressed, a log-event is triggered.|
+|Pressed and Held| When the on-board is pressed and held down for 30 seconds, the IoT Node - LoRaWAN board is reset: settings are erased and the board restarted.|

docs/other_features.md

@@ -251,6 +251,7 @@ nav:
     - Introduction: introduction.md
   - Getting Started: 
     - Getting Started: getting_started.md
+    - Other Features: other_features.md
   - Settings:
     - Overview: settings_overview.md
     - Settings: settings_settings.md