Recommend a good router for development environment

you don't need a special router to connect to/from a Roku.

the issues you have experienced, i'd suspect say wireless isolation being enabled in the router (that's when it block wifi-to-wifi connections, randomly googled info here https://denon.custhelp.com/app/answers/ ... -isolation) - or maybe one of the devices is connected to a "guest zone" and routing between zones is not enabled (see here https://eu.dlink.com/-/media/Consumer_P ... 1130EN.pdf)?