Asked and covered. Thanks Aphrodite. And to confirm WebRTC is on Crosswalk however they have openly said that it's in rudimentary level so performance is not so good. Likely performance will be fine by time any big MP game is out. Since your game is turn base then there is even less worry.
Also Fimbul is wrong. Network gaming on mobile is fine. It's been brought up before and shot down before. There are a handful of active online MMO on mobile devices.