Implement endpoint(s) for use by Alexa skill(s)

[jxmot]

Implement a means to respond to http queries sent from AWS(requestor) on behalf of an Alexa skill.

Requirements:

• Must obtain necessary data with very little impact on the node-dht-udp application
• Must verify that requestor is valid. The requestor must supply a valid ID within the query that it sends.
• Will not access the MySQL database to obtain the necessary data. Instead it will "watch" a JSON formatted text file for changes. The node-dht-udp application will write to the file when ever data is updated. This is the same data block used in resending to new clients when they connect.
• Most aspects of this application will be configurable:
  • Address & port to listen on
  • Device<->Path table
  • Data file : path + name + extension
  • Unique requestor ID(s)
• Data request paths handled:
  • Request all sensors
  • Request a specific sensor
  • Request weather data (if stored in JSON file), must consider:
    • Service format
    • Forecast data period for a format
    • Observation data for a format
• Will not handle any "commands", this application will only provide data

[jxmot]

Current work can be found in the 20190101-sensorlast-filewr branch during development. Upon completion and merging into the master branch the development branch will be deleted.