The ESP8266 is a low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller capability produced by Shanghai-based manufacturer Espressif. wikipedia 
Server reports all devices seen on last scan reporting raw temperature readings in 1/16 degree Celsius.
{ "28F0BAF6": 322, "28DE9AF6": 322, "2851B4F6": 323, "28CF99F6": 320 }
We use fixed ip addresses in the 10.0.1.20 range based on the device mac address. Set with Clients ⇒ Properties ⇒ Configuration ⇒ Use fixed IP address. unifi
Four thermometers on one WiFi server. Desk: 10.0.1.20.
Our intention is to improve upon our long-running Sensor Server software which is one of the first live data sources incorporated into federated wiki. See List of Sensors
We demonstrate the parallel fetch from all three sensors using promises to overlap io. Now with timeout for offline servers.
ESP8266 Programming details.
We've aded a page that fetches and plots samples using plotly-js. We've looked up some examples that helped. lines extends plot
Source code here and in the SensorServer repo. github
esp
We should consider overlapping the temperature conversion steps when reading multiple thermometers from a single server. Replace next_sensor with convert_all and then sample_all 750ms later.
See ESP8266 Datalog for sample recordings.