BLE ScanSettings/AdvertiseSettings

brumm63 · Oct 14, 2021

Hi all,

I have been working on a reverse engineering project for a particular android application and I have come across some interesting methods which I can not find any documentation for.
This application uses the Android Bluetooth Low Energy API which involves setting up some ScanSettings and AdvertiseSettings.
For example, when the application makes it's AdvertiseSettings object it uses the AdvertiseSettings.Builder as so:

Code:

new AdvertiseSettings.Builder().setAdvertiseMode(100).semSetCustomAdvertiseInterval(i).setConnectable(true).setTxPowerLevel(3).build()

The part I do not understand and have not been able to find any information on is the

Code:

setAdvertiseMode(100)

and then

Code:

semSetCustomAdvertiseInterval(i)

.
From the android documentation, the

Code:

setAdvertiseMode

method should take one of three options:
ADVERTISE_MODE_LOW_POWER = 0, ADVERTISE_MODE_BALANCED = 1, or ADVERTISE_MODE_LOW_LATENCY = 2.

As well as this, the

Code:

semSetCustomAdvertiseInterval

method does not seem to exist in the android documentation or any where I can find.

A similar thing happens when the

Code:

ScanSettings

are made using

Code:

ScanSettings.Builder

. It uses:

Code:

builder.setScanMode(100)

.

If I try and make a ScanSetting or AdvertiseSetting that is set to mode 100 within my own application, I just receive errors.

So I am wondering if anyone has any idea or can enlighten me on what may be happening here?

BLE ScanSettings/AdvertiseSettings

brumm63

Lurker