How to use
Download and install controller_emulator.apk on your controller phone.
On your headset phone with Android version bewteen 4.4 and 6.0.1 download and install services-gvr-emulator.apk (direct link)
Download and install samples-controllerclient.apk (direct link - version prepared for Android >= KitKat).
On your controller phone run Controller Emulator - at the top you will see ip address.
On your headset phone run Emulator VR Services > Controller Emulator Settings > Wi-Fi - should be enabled, below this in section "Wi-Fi settings", complete field "IP Address" with ip address of your controller phone.
Pair your headset phone with controller phone.
On your controller phone run Controller Emulator.
On your headset phone run Emulator VR Services > Controller Emulator Settings > Bluetooth - should be enabled, below this in section "Bluetooth settings", choose proper "Device address" of your controller phone.
On your headset phone run Daydream Controller Sample, you should see "Controller Connection: CONNECTED" and on controller phone you also should see "CONNECTED".
Play with you controller phone and observe changes on headset phone
Download controllerpaint.apk on your headset phone and draw with your controller phone.