Which RFlink should I buy? (newbee?)

[jackwan1]

I was recommended to look into rflink:

https://www.nodo-shop.nl/en/search?orde ... ery=rflink

Which device I should buy? I don't know enough to tell the difference. I do have the followings

1 old PC running Ubuntu and mqtt server(mosquitto) - node red
1 old Pc running Ubuntu and domoticz
Several sonoff devices flashed with espeasy
Some Rf devices and I believe they are all 433mhz. 3 of them are
http://switchcn.sh08.host.35.com/USA-CA ... 36U-1.html
Several security cameras I know how to extract images, foxcomm like and avtech
Arduino Xboard running mydooropener.com software
prowl service, already hooked up with Domoticz