I want to know how to send notifications to my gadget that is not Echo Button.
I wonder I can receive a data through notifications for control my gadget.
I found a source code about the notification in alexa-gadgets-sample-code
I don't understand how to use it.
Already I have experience making Event of my gadget using nanopb for pairing and handshake.
but I think Directive is the sending message from echo to my gadget.
Could you tell me how to use it or let me know example code?