OpenEmbedded "poky" with some sysmocom specific modifications. Mostly used only up to sysmocom release 201310, but the "pyro" branch is still used for 201705
* the entry "option subnet" takes the
subnet mask not the subnet address,
while the busybox dhcp-client was
fine with it, the isc-dhcp-client complained with
Error: an inet prefix is expected rather than "10.23.24.113/10.23.24.0".