Create SR-SRYRS_Hub.ino

Hardware:
Teensy 2.0 (3.3v)
Adafruit OLED (3.3v)
WIZ811MJ Rev1.1 Ethernet Controller (3.3v)
XBee Series 2 (3.3v)
   PanID: 1AAA
   Node3: 0013A200 40321853 (coordinator)
   Node2: 0013A200 40315565 (sensor)
   Node4: 0013A200 40315568 (switch)

This uses the existing XBee library, but uses regular Serial instead of SoftwareSerial(may be an issue with standard Arduino). The hub sends a an I/O request to  the sensor node. The data is sent back inside the confirmation frame. If the analog value exceeds a threshold, a pin change (high) request is made to the switch node, otherwise a pin change (low) request is sent.