Systemd starts daemon to early
systemd[1]: Started SMA Energymeter measurement daemon. sma-daemon.py[574]: Traceback (most recent call last): sma-daemon.py[574]: File "/opt/smaem/sma-daemon.py", line 24, in sma-daemon.py[574]: import smaem sma-daemon.py[574]: File "/opt/smaem/smaem.py", line 49, in sma-daemon.py[574]: sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq) sma-daemon.py[574]: OSError: [Errno 19] No such device systemd[1]: smaemd.service: main process exited, code=exited, status=1/FAILURE
should create a .socket file with ListenNetlink= MCastGroup need to import more systemd - stuff to brain.