Bluetooth® Low Energy GAP Roles

Bluetooth® Low Energy (BLE) devices can operate in one or more Generic Access Profile (GAP) roles at the same time (provided the Link Layer supports this):

The role imposes restrictions and enforces behavior, so it is generally fixed in the design stage of the device.

Two role pairs are defined, allowing devices to communicate with each other.

Broadcaster/Observer

This role pair implements unidirectional, connection-less communications.

Broadcaster

Observer

  • Scans for broadcasters, listening for advertising data
  • Uses the Link Layer Scanner role

Network Topology

topology-broadcast.png

Peripheral/Central

This role pair implements bidirectional, connection-oriented communications.

Peripheral

  • Link Layer Slave role
  • Advertises by using connectable advertising packets
  • Optimized to consume the least amount of processing power and memory
    • Enables a low-cost design

Central

  • Link Layer Master role
  • Capable of establishing and managing a connection
  • May be connected to various devices simultaneously

Network Topology

topology-unicast.png


For data transfer operations in BLE connections, different roles are defined by the Generic Attribute Profile layer.

© 2016 Microchip Technology, Inc.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.