listSites

Retrieves a list of all available Vista "sites"

End-Point is located at: https://devices.vantage.co/api/listSites.php
Parameters are provided to the end-point as POST data in JSON format
Results are returned in JSON format

Parameters TO end-point:

  apikey  the 32-character API Key (validates the end-point user)

Results FROM end-point:

  Result         either "OK" or "FAIL"

  ResultCode     0 = Success ('Result' = "OK")
                 1 = apikey was not provided
                 2 = apikey was not valid
                 3 = apikey has expired

  Message        Human-readable explaination of ResultCode
                 Appropriate for display to user for ResultCode values other than 0

Upon a ResultCode of 0 (success), the following JSON data will also be present:

  site_count     Number of "site" objects returned
  sites[]        Array of "site" objects

Each "site" object contains:

  site_id        The ID of this site (used in other calls that require the specific site to be specified)
  sitename       Name (description) of the Site