New port: devel/libsml

libSML is a library which implements the Smart Message Language
(SML) protocol specified by VDE's Forum Netztechnik/Netzbetrieb
(FNN). It can be utilized to communicate to FNN specified Smart
Meters or Smart Meter components (EDL/MUC).

WWW: https://github.com/volkszaehler/libsml

PR: 227367
Submitted by: Gerrit Beine <mail+freebsd@gerritbeine.de>