Portfolio · Written for this search · iot
IOT
Systems desk
IOT is short for the Internet of Things. It means ordinary devices that sense, act and talk over a network. The Systems desk treats it as an arrangement of parts, not as a product.
- Sensor or actuator
- Local gateway
- Network link
- Cloud service
- Decision
- Command back to device
What the term covers
IOT names a pattern, not a single technology. A device reads something from the world, or changes something in it. It passes data to a gateway. The gateway forwards it to a service that decides what to do next.
The loop closes when a command returns to the device. The desk draws the concept as that loop. Where the decision is made is the main design choice. It can be made at the device, at the gateway or in a remote service. That split is the same kind of question we meet in hybrid execution.
Where the arrangement strains
A sensor reading is a sample, not the truth. Devices drift, drop packets and report late. Reasoning about what a reading can support starts with the ideas in measurement and sampling. It continues with the account of imperfect signals in noise and error.
Constrained devices add a second strain. They have little power, little memory and long service lives. They may not be updated for years. The desk therefore asks what happens when a link is lost, when a device is stale and when a command arrives twice.
How the desk reads it
The desk does not publish figures for IOT in this note. It makes no claim about adoption, cost or performance. It asks four questions of any proposed system. Where does the decision sit? What does a bad reading do? Who can change the device? What is the safe state on failure?
Those questions apply before any vendor is chosen. Related desk work is listed in the portfolio. Wider definitions are kept in the documentation.
Finding from this desk
An IOT system is only as trustworthy as its weakest link between sensor, network and decision. The desk has recorded no measurement of any deployment here. This note sets out how to reason about the arrangement.