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9e5db157f8
Adds support for advertising and connections with coded/2M PHY's. Adds new classes `NimBLEExtAdvertising` and `NimBLEExtAdvertisement`. When extended advertising is enabled the original advertising classes become unavailable and the new classes must be used. Changed some return values for advertising methods for consistency with the new classes methods.
29 lines
1.7 KiB
Markdown
29 lines
1.7 KiB
Markdown
# 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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