aioble updates - generic attribute service/service changed #439
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Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Ensure newest keys are stored at top to be used/loaded first.
Also present database_hash for newer devices.
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This change has been deprecated in favour of micropython/micropython#7877 |
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This MR includes a few changes in a working branch.
Service Changed is an important feature for any project where the BLE pairing&bonding is used and services/characteristics could be changed, either from modifying application settings, to rolling out in-field updates.
Most BLE clients (eg android/ios phones) will cache the service discovery when bonded to a device. This means that if these are later changed on the device, the phone doesn't know about it and will send the wrong data to a different characteristic.
The BLE service:
Generic Attribute Servicecontains a characteristic that can be indicated immediately after connection to tell the client that some/all the services/characteristics have changed and should be re-discovered.For newer (BLE5.1) clients, there's a separate Database Hash characteristic that contains a hash of all services/characteristics configuration which the client can check directly and check against its stored hash for any change, also prompting re-discovery.
Both are supported in this change, however it needs the existing default gatt service entry removed with micropython/micropython#7675