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30 lines
1.7 KiB
Markdown
30 lines
1.7 KiB
Markdown
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# Bluetooth 5.x features
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## About extended advertising
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Extended advertising allows for much more capability and flexibility.
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* Allows for 251 bytes of advertisement data and up to 1650 bytes when chained (configuration dependant) vs 31.
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* New PHY's (physical layers) that allow for faster data rate (2M PHY) or long range/slower data rates (CODED PHY) as well as the original 1M PHY.
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* New periodic advertising, allowing the scanning device to sync with the advertisements of a beacon. This allows for the scanning device to sleep or perform other tasks before the next expected advertisement is sent, preserving cpu cycles and power (To be implemented).
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<br>
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## Enabling extended advertising
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Extended advertising is supported when enabled with the config option `CONFIG_BT_NIMBLE_EXT_ADV` set to a value of 1. This is done in menuconfig under `Component config > Bluetooth > NimBLE options >
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Enable extended advertising`.
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When enabled the following will occur:
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* `NimBLEScan::start` method will scan on both the 1M PHY and the coded PHY standards automatically.
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* `NimBLEClient::connect` will use the primary PHY the device is listening on, unless specified (see below).
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* `NimBLEClient::setConnectPhy` becomes available to specify the PHY's to connect with (default is all).
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* `NimBLEAdvertising` is no longer available for use and is replaced by `NimBLEExtAdvertising`. `NimBLEDevice::getAdvertising` will now return an instance of `NimBLEExtAdvertising`.
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* `NimBLEAdvertisementData` is no longer available for use and is replaced by `NimBLEExtAdvertisement`. This new class is where everything about the advertisement is configured, including the advertisement intervals and advertisement ended callback.
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