Raspberry Pi sensorgnomes should not be assigned static IP addresses

[jbrzusto]

the web server listens on all network interfaces, so needs to be behind a firewall that blocks access to port 80!

[jbrzusto]

need to rethink SG security on the Pi platform; common use cases

• user <-- ethernet cable --> Pi
• user <-- Pi WiFi hotspot --> Pi
• user <-- ethernet cable or WiFi --> router <-- ethernet or WiFi --> Pi
• user <-- internet --> Pi