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The generated config file uses /tmp for the spool directory. However, /tmp is cleaned out on reboot so all buffered readings are lost. /tmp is not a good default location.

At start-up the web UI calls the server API to get the list of rooms. When switching room, the web UI calls the server API to get the list of sensors for that room. The current API implements this function using the mongo DB distinct() function; this gets slower as the database grows.

Instead, build a small collection that just has the list of rooms and the room sensors, and use this to fulfil the room list and room sensors API query. The collection can be populated when a new reading is received from an unknown room/sensor, and/or by another API call that would be called by user action.

If starting the sensor client automatically at boot time, the python-requests library could fail with the error "getrandom() initialization failed". This issue is fixed by installing the rng-tools package using: sudo apt install rng-tools. The package should be included in the set-up instructions.

Thanks to this stack overflow artical for the tip.

If a server send fails, the record is buffered for next time. These build up and each can take 60 seconds to time out when retrying This can cause us to miss the next record loop, Instead, if a send fails once to a URL, do not try that URL again until next time round. Instead buffer the record immediately.

There have been updates to the JavaScript libraries used in the README so test the current releases and updated the README.