I found another (more recent?) tool called open-plc-utils
after installing it’s enough to call something like: plcstat -i wlp1s0 -t
to get a output like this:
P/L NET TEI ------ MAC ------ ------ BDA ------ TX RX CHIPSET FIRMWARE
LOC STA 003 30:XX:XX:XX:XX:XX 9C:XX:XX:XX:XX:XX n/a n/a QCA7420 MAC-QCA7420-1.1.1.1193-03-20140207-CS
REM CCO 001 30:XX:XX:XX:XX:XX 80:XX:XX:XX:XX:XX 050 071 QCA7420 MAC-QCA7420-1.1.1.1193-03-20140207-CS
REM STA 002 30:XX:XX:XX:XX:XX 24:XX:XX:XX:XX:XX 014 034 QCA7420 MAC-QCA7420-1.1.1.1193-03-20140207-CS
REM STA 004 30:XX:XX:XX:XX:XX 34:XX:XX:XX:XX:XX 061 077 QCA7420 MAC-QCA7420-1.1.1.1193-03-20140207-CS
So now there should be only little work left to “bridge” this command line output into ha 
Some more links:
And looks like openwrt actually can collect plc information too: