I found this excellent article on creating a basic Alexa skill. Follow this tutorial to get a basic skill and use the php code below instead of the shell script in the tutorial as the Synology does not like non-PHP scripts.
<?php header("Content-Type: application/json;charset=utf-8"); ?> { "version": "1.0", "response": { "outputSpeech": { "type": "PlainText", "text": "Got it. Yes, your command was received."} }}
In the Amazon skill testing you can see the JSON data sent to the Synology. After the tutorial you will find that that you are only sending the date and no other command data. To send more data the Amazon skill will need to be further developed.
More to come on linking the broadlink and Alexa skill