Get data from a remote ATLAS SQL database.
wat_get_data( tag, tracking_time_start, tracking_time_end, tag_prefix = "31001000", database = "some_database", host = "abtdb1.nioz.nl", username = "someuser", password = "somepassword" )
| tag | A three digit numeric representing the ToA tag.  | 
    
|---|---|
| tracking_time_start | Character representation of time (Central European Time, +1 UTC) from which start point data should be retrieved.  | 
    
| tracking_time_end | Character time representing the end point corresponding to the above start point.  | 
    
| tag_prefix | A numeric specifying the tag prefix.
Defaults to   | 
    
| database | The database name on the host server. Defaults to
  | 
    
| host | The server address on which the data are stored.
Defaults to   | 
    
| username | Username to access the data.  | 
    
| password | Password to access the data.
Contact   | 
    
A dataframe of agent positions, filtered between the required tracking times.