check: viewtopic.php?f=49&t=11817

Did you make the usb port persistent?

From the FAQ: Synology NAS: Q: What do I need to use RFlink on a Synology NAS? A: If you want to use RFLink with a Synology NAS you can use: - an Arduino Mega clone based on CH340 USB/serial chip In all other cases: - connect a 10 uF capacitor between reset and ground on the Arduino. Simply stick ...

Make a debug log as explained here:
http://www.nemcon.nl/blog2/2015/07/cc
and mail the data from your remote control buttons to
[email protected]

He is referring to the rflink firmware.
That did not move and indeed is not up to date..

that would be an EV1527 ...
This PIR is supported by the rflink gateway

I will add the select plus to Nodo
I got 2 of these doorbells already for tests.