could someone explain the use of service uuid AD type in Bluetooth low energy ??

[stiger]

..

[Winfred LU]

Based on its value, it specify the type of the followed advertising data.

For example, 0x16 means the advertising data a complete list of 16-bit service class uuids.

[stiger]

why we include service uuid AD type in advertising packet ??

[Winfred LU]

We do so when needed.

For example, when we intend to advertise the services that we are offering.

[Winfred LU]

One of the simple advantages would be

others will not have to connect to the device in order to know what services it provides.