Is it possible to connect with Wahoo KickR? How in that case?

Xert Mobile supports the ANT+ FE-C protocol. You’ll may need to upgrade your KICKR firmware in order to get that support. You can either use an ANT+ compatible Android phone or use an ANT+ stick with a USB OTG cable. Be sure to install the ANT+ Android drivers, including the USB driver if you’re using an ANT+ stick. HTH.