Higher-level functionality

[ItsHarper]

• Auto-scheduling of keep-alives
• RevHub class gets these members:
  • isParent field
• Method to create a RevHub should auto-open the serial port and query all known interfaces
  • Should accept serialNumber, parentAddress as parameters (children are added by calling a separate method)
  • Will find correct serial port for the serial number, open it, and start keepalives and query interfaces for all children
  • Returns singular RevHub object with children field populated
  • Closing parent RevHub closes all children and serial port
  • Closing any RevHub stops keepalives
  • Closing child RevHub removes from parent
• Method to do discovery on a given serial number
• Method to do discovery on all connected Expansion Hubs
• ParentRevHub#addChildByAddress(int address): RevHub (also adds to children array)
• RevHub#discoverChildren(): RevHub[] (replaces children object contents)
  • Must NOT replace existing RevHub instances who were also found in discovery
  • Takes an options object as a parameter with a removeDisconnectedChildren field
• Not sure of how RHSPLib handles this, but changing a hub's address needs to auto-update all the appropriate fields, ensure keepalives keep working, and check for conflicts (both via discovery and via assumed toplogy) before sending the address change command

[LandryNorris]

#30 adds the children property. #29 adds the discover all hubs method. Others will be added.

[ItsHarper]

I updated this issue description with checkboxes, updated some things, and checked off completed items. Discovery is still a big place that this library is lacking. When we add better discovery support, the sample needs to be updated to make specifying a parent address optional.