Write down the decisions a user needs to make: investigate a reading, check a device, assign a follow-up or review a trend. Work backwards to the data and context each decision requires. A temperature number without a timestamp, unit or device identity can be hard to interpret.
Define device messages, timestamps and units
Agree device identifiers, units, timestamps and error states. Decide how the receiving system distinguishes a new message from a duplicate and how it represents readings that arrive late. Keep a sample payload with the interface documentation so firmware and application teams can review the same example.
Handle missing readings and connectivity gaps
A device that has not reported is different from one reporting a normal value. Define expected reporting intervals, stale-data behavior and how users see a connectivity gap. Include recovery scenarios when connections return rather than only testing the happy path.
Assign alert ownership and follow-up actions
Describe who receives each alert, how it is acknowledged and what closes the follow-up. Separate a notification from a completed action. Walk through a real operational scenario with the people who will use the system before finalizing the screens.
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