Command sent. Did the device actually execute it?
How to design device control that distinguishes acceptance from motion, recovers the result after a lost response, and shows what is known after a restart.
Systems and integration
Architecture, communication and integration across devices, applications and services.
The system is slow. Which part is responsible?
Locate delay between a sensor and its dashboard: three equally slow flows, clocks, traces, queues and a reproducible comparison of mean latency and p99.
APIs change, devices remain: compatibility over several years
How can an API add quality and absent measurements without silently changing meaning? JSON and proto3 contracts, a version matrix, migration, history and rollback.
Connected devices: updates, connectivity loss and diagnostics
What happens during an outage and after reconnection: a worked storage budget, duplicate delivery, catch-up throughput and updates with a recovery path.
