OpenEmbedded "poky" with some sysmocom specific modifications. Mostly used only up to sysmocom release 201310, but the "pyro" branch is still used for 201705
I have no idea who creates the /run/openvpn directory on Debian.
The path is not in a tmpfiles.d and I don't see the generator
creating it or the service file indicating that it needs to be
created. Place the file with openvpn.NAME.status into the /run
directory which appears to work on the device.