I’d first check that the zwave binding was active (in Karaf, bundle:list|grep -i zwave). If the zwave binding was not active, there are a lot of possible issues. But if it is, I’d verify the port for the controller was correct. A dmesg|grep tty usually shows enough to figure out the port. If it changed from what was previously configured, you may want to look into using UDEV rules.
