The add-ons I’ve been using to watch the NBA are within Sports Devil.  Go to Sports Devil-Live Sports-LiveTv.Ru or Rojadirecta.me.

Both gave worked for me with LiveTV being the best.  You may find luck with other channels but this has been my experience.

FYI: I’ve used these add-ons for live UFC as well.

One thing to keep in mind… if the game is NOT  currently on, you won’t be able to watch it live.  So if you see a link for a Knicks vs Celtics game (for example) at 8pm and it is 7:30 pm – the link won’t work until after 8:00 pm.