Google Over-the-Air (GOTA) - How does it work?

Hi Kumaresh90 

Good questions! Not wholly enterprise but I have experience managing OTA updates with GOTA working in an OEM so -

GOTA is only available to OEMs. Hardware resellers don't see it. Each OEM has their own account and devices when approved by Google are registered into GOTA for update management by the OEM. 

If a customer happens to have a custom certified software SKU (image), some control over update frequency and schedule is possible through working directly with the OEM, otherwise no, your devices will see the same schedule all others on that SKU will, and you'll need to lean on alternative APIs (such as system update management) to schedule/postpone them. 

There are OTA platforms outside of GOTA, such as Samsung's e-FOTA, Motorola and HMD have their own also. These function wholly the same but offer customer control through direct customer portal access.

Hope that helps!

Do you mean Recommended and Automatic? 

Automatic for non-AB devices will download and reboot the device to update with no user input, this can be disruptive. For AB devices it's similar but admins can set a reboot window instead. 

Preconfigurations define if Wi-Fi or cellular is used, but in all cases an OTA won't action unless the device is at minimum 20% battery when charging, or 40% when not charging, that can't be overridden.