Reasons for SSL: • Security • The server you speak with requires SSL Reasons for no general purpose OS: • Limited power (battery, solar) • Extreme cost pre

Reasons for SSL: • Security • The server you speak with requires SSL Reasons for no general purpose OS: • Limited power (battery, solar) • Extreme cost pressures (linux needs about $5 of hardware) • Security (smaller code to audit) • Extreme reliability requirements So anything that ticks a bullet in each category is a candidate. • Remote sensors • Radio gateway, say LoRa to an internet server • A device which keeps a secret for you and provides it to a server on command, perhaps something in a 2FA vein. • Remotely triggerable actuators (door locks, parking lot lights)