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solargrapher is a minimalistic implementation of the ComLynx protocol, spoken by solar inverters made by Danfoss, IBC Solar et al.
It logs whatever data you deem interesting in rrd file and has a minimal example on how to produce graphs for a cgi-enables webserver from that.
Webtunnel is an HTTP tunnel with some unique features: it runs in the context of a web server; it uses simple requests/responses for proxy traversal; and it is multi-threaded to allow many parallel connections to many destinations simultaneously.
C++ libraries for creation of CGI applications. Functions include stream operators for the creation of HTML formatting, forms, etc. URL decoding and element retrieval, MySQL access, and encryption.