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Mastering Arduino by Jon Hoffman

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Bluetooth LE connections

The following diagram shows how Bluetooth connections work:

As with the Bluetooth LE broadcasting topology, the connection topology also defines two roles:

  • Central: The central is usually a device such as, a laptop, tablet or phone. These devices will scan the advertising channels and listen for connectable advertising packets. When a device is found, the central may attempt to establish a connection to the device. After the connection is established the central manages the timing and initiates the data exchanges. The central device can connect to more than one peripheral.
  • Peripheral: The peripheral is usually a device ...

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