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Bluetooth has now been completely exorcised as the DHT22 and DS18B20 toting version of the sensors has been upgraded into a NodeMCU module.

Replaced the sensors carrying only a DHT22 with ESP8266-01 versions communicating through MQTT. Seems to be rock-steady after adding a capacitor to ensure steady power to the ESP.

The third sensor needs more pins for the two temperature sensors, so it has to be made with an ESP-12 or a NodeMCU board. Which I happen to have.

It's quite fast to make an HTTP API connected Pebble app using the pebble.js framework and the Cloudpebble browser IDE, so I made a dashboard app that provides a similar view into the measurement data as the web dashboard.

The app shows the current values for each sensor in a menu UI and each item can be drilled into for information on the previous measurement and the time of measurement.

Built a prototype for a DHT22 and standalone ESP8266 (ESP-01) combination. Sensor values are transmitted through the MQTT server. Works quite nicely although the ESP got mysteriously stuck on one test run after a couple of hours.

Considering replacing the HC-06 modules with ESP8266. The Bluetooth connection is extremely prone to failing. Even a slight change in the placement or orientation of the sender or receiver can cause a huge difference in reliability.

Also this change would get rid of the node.js middleman which is a huge bonus.