-
InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If the esp is connected to a router and has an IP address, this does not mean it is connected to the internet. I suggest you ping a server, like www.google.com. I think this library is suitable for that, although I haven't tried it myself. https://github.com/dancol90/ESP8266Ping
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.