Advertising and scanning states in Bluetooth Low-Energy
Advertising and scanning states in Bluetooth Low-Energy
- Subject: Advertising and scanning states in Bluetooth Low-Energy
- From: pietro gonizzi <email@hidden>
- Date: Mon, 13 Feb 2012 18:46:33 +0100
Hi all,
in the Core Specification 4.0 for Bluetooth Low Energy, devices entering the Scanning State shall listen on an advertising channel index (37, 38, or 39, respectively) for the duration of the
scanWindow parameter. Then, the
scanInterval parameter is defined as the interval between the start of two consecutive scan windows. Both parameters should be less than or equal to 10.24 s, with
scanWindow less than or equal to the
scanInterval.
Are there any default values used for these parameters? Is it possible to configure the
scanWindow parameter from the host?
Regarding the Advertising State, the BluetoothDesignGuidelines indicates an
Advertising Interval parameter of 20 ms for at least 30 seconds. Within this interval, an advertising event shall transmit an advertising PDU at each of the 3 advertising channels. The specification says that the time between the beginning of two consecutive PDUs within an advertising event shall be less than or equal to 10ms. How is this time computed? Which value is used for that? Does it depend on the value of the
Advertising Interval parameter?
For instance, if you use
Advertising Interval=20 ms, then the time between two consecutive PDUs should be at least less than 20/3=6.66 ms. Is this correct?
Any help would be appreciated.
Regards,
Pietro Gonizzi
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