I need to establish a TCP/IP and/or UDP connection between Raspberry Pi and a special sensor which is not very configurable, but it has Ethernet. Normally, this sensor is connected to a PC or PC-like device (through Ethernet, directly) which runs a special software. Neither Raspberry Pi nor the sensor have access to the internet.
So, in order to get them to communicate I need Raspberry Pi to assign a local IP to this sensor. I tried to set up a DHCP server with no luck, service fails to start. This is my configuration: