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All developers actively developing experiences for Google Cardboard should use the open source Cardboard SDKs for iOS, Android NDK, and Unity XR Plugin.
The Daydream View VR headset is no longer available for purchase as of October 15, 2019. As of November 2023, previously supported devices will no longer be able to download and install Google VR Serivces (Android application ID com.google.vr.vrcore) for new users.

Debugging the 6DoF faceplate and Mirage Solo using adb via Wi-Fi

The experimental 6DoF faceplate uses the USB port on the Mirage Solo for power and communications with the headset, which means the USB port operates in host mode. When using adb for debugging, however, the USB port on the Mirage Solo needs to operate in device mode because the PC it's connected to is operating in host mode. This means adb can't access the Mirage Solo via USB while the 6DoF faceplate is plugged in.

The best alternative for debugging in this scenario is to use Wi-Fi for connecting adb to the Mirage Solo.

Determine your development machine IP address (ipconfig on Windows, and ifconfig on macOS).

Identify the IP address of the Mirage Solo. If you don't know it, perform these steps to identify it:

Using a USB cable, connect the Mirage Solo to a PC.
Verify that the PC and the Mirage Solo can communicate with each other over Wi-Fi. For example, run adb shell ping YOUR.HOST.IP and check that traffic can pass between the devices.

In the command line, run adb shell ip addr show wlan0, and note the IP address (listed on the line that begins MIRAGE.SOLO.IP.ADDRESS/MASK).

   $ adb shell ip addr show wlan0
   5: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state 
   UP group default qlen 3000
       link/ether M:A:C:A:D:D:R:E:S:S brd ff:ff:ff:ff:ff:ff
       inet MIRAGE.SOLO.IP.ADDRESS/MASK brd MIRAGE.SOLO.IP.127 scope 
       global wlan0
       valid_lft forever preferred_lft forever
       inet6 IP::V6::A:DD:R:E:SS/MASK scope link flags 800
       valid_lft forever preferred_lft forever

Connect adb to the Mirage Solo for use over Wi-Fi.