C...! I switched RPI v2 for a v3 and just flashed the latest OctoPi supporting RPI 3. No new IP adresses on my network. To begin with I said to my self to test the RPI before I mount it in the BB. I also said to my self I should mount a HDMI and USB breakout panel mount connectors so I could connect a monitor and keyboard. Of course I did no such thing! Give it another try tomorrow and reflash and triple check the network config before springing it open.