Flight-RNH: Feature complete

[ThirteenFish]

This is an issue created specifically for Alpha 2

Major features:

• Respond to version command
• Respond to ARM command
  • Arm is successful only when there are no battery or port faults, all ports are on.
• Respond to SAFE command
  • Disables RR
• Respond to Rocket Ready command
  • Is a heartbeat, when enabled turns it on for TIMEOUT seconds
• Ports:
  • Respond to PORT command to turn on and off ports, set port current sample rate, port state, faults
  • Sample port current draw and send over ethernet
  • Monitor port faults and send an error packet when it faults
• Battery
  • Handle charging by BQ24725
  • Log shore power current draw to ethernet
  • (BQ3060) Collect battery charge information and send over ethernet
  • (BQ3060) Send error packet when battery faults occur
• Ethernet
  • Enable KSZ8999 at startup
  • Disable when going to sleep
• Handle sleep command
  • Can only sleep when shorepower is off and all ports are off
• Stretch Goal: Respond to TIME command for SD card logging
• Stretch Goal: Watchdogs, lookcats, hoochhounds, observation lemurs, etc.