[OnePlus 3 & 3T Cross Device Development] dajoe:
I am trying to get Ant+ running. Using Ant Tester I figured out I had to install the ANT Radio service from play store. However, I am still not able to get it running. From logcat:

04-30 18:55:09.414 4467 4467 W Settings: Setting airplane_mode_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.415 4467 4467 W Settings: Setting airplane_mode_toggleable_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.417 4467 4467 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.419 4467 4467 W Settings: Setting airplane_mode_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.419 4467 4467 W Settings: Setting airplane_mode_toggleable_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.420 4467 4467 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.421 4467 4467 W Settings: Setting airplane_mode_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.421 4467 4467 W Settings: Setting airplane_mode_toggleable_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.422 4467 4467 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.428 1046 5042 E antradio: Failed to load vendor component
04-30 18:55:09.428 1046 5042 E antradio: failed to open dev /dev/ttyHS0: No such file or directory
04-30 18:55:09.428 1046 5042 E antradio: failed to enable channel /dev/ttyHS0: No such file or directory
04-30 18:55:09.428 1046 5042 E antradio: ant enable failed: No such file or directory
04-30 18:55:09.429 4467 4485 E Adapter 1 - AdapterStateMachine: Error - Enable failed to complete successfully.
04-30 18:55:09.433 4467 4485 W Settings: Setting airplane_mode_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.434 4467 4485 W Settings: Setting airplane_mode_toggleable_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.434 4467 4485 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.439 1046 5043 E antradio: Failed to load vendor component
04-30 18:55:09.439 1046 5043 E antradio: failed to open dev /dev/ttyHS0: No such file or directory
04-30 18:55:09.439 1046 5043 E antradio: failed to enable channel /dev/ttyHS0: No such file or directory
04-30 18:55:09.439 1046 5043 E antradio: ant enable failed: No such file or directory
04-30 18:55:09.440 4467 4485 E Adapter 1 - AdapterStateMachine: Error - Enable failed to complete successfully.
04-30 18:55:09.443 4467 4485 W Settings: Setting airplane_mode_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.444 4467 4485 W Settings: Setting airplane_mode_toggleable_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.444 4467 4485 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.449 1046 5044 E antradio: Failed to load vendor component
04-30 18:55:09.449 1046 5044 E antradio: failed to open dev /dev/ttyHS0: No such file or directory
04-30 18:55:09.449 1046 5044 E antradio: failed to enable channel /dev/ttyHS0: No such file or directory
04-30 18:55:09.449 1046 5044 E antradio: ant enable failed: No such file or directory
04-30 18:55:09.450 4467 4485 E Adapter 1 - AdapterStateMachine: Error - Enable failed to complete successfully.
04-30 18:55:09.626 4467 4480 W Settings: Setting airplane_mode_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.627 4467 4480 W Settings: Setting airplane_mode_toggleable_radios has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.629 4467 4480 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
04-30 18:55:09.637 685 685 I cnss-daemon: RTM_NEWNEIGH message received: 28
04-30 18:55:09.637 685 685 E cnss-daemon: Stale or unreachable neighbors, ndm state: 4
04-30 18:55:09.641 4426 4426 W AntPluginPcc: BBD30400: RequestAccess failed: ADAPTER_NOT_DETECTED

The device exists, though

$ adb shell ls -l /dev/ttyHS0
crw-rw---- 1 bluetooth net_bt 242, 0 1970-04-26 23:24 /dev/ttyHS0