Allow for support classes to send a write request response to the
device, fi requested. The standard actually expects this to happen, but
Gadgetbridge did not originally support it, so there are concerns that
enabling this globally will cause issues for devices that do not expect
the response.
See also: https://codeberg.org/Freeyourgadget/Gadgetbridge/pulls/2831#issuecomment-941568
- Remove notification on unneeded characteristics for Zepp OS devices
- Reset MTU before initializing device, since the support class is
reused when reconnecting, and keeping the previous high MTU before
renegotiating again can make the initialization fail sometimes
(band will never reply)
- If any of the chunked characteristics is null during initialization,
mark the device as waiting for reconnect, which will make it retry the
connection later with a backoff delay.
Moved to AbstractDeviceSupport so each device support class can override them if required. This change helps to keep the code base clean by not requiring every (Device)Support class to implement these methods even when they don't need them.
It occurred to me that onServicesDiscovered() was called multiple times
whenever I connected to my Mi Band 2. Either the band actually sent the
characteristics in multiple chunks or Android itself notified multiple
times.
So we gracefully handle this by
- updating the list of characteristics
- *not* initializing the device again when it *is* already initialized
or at least initializing.
Some APIs have become synchronous, it seems, e.g.
connectGatt() -> onConnectionStateChanged() -> discoverServices() -> onServicesDiscovered()
appears to happen synchronously. So connectGatt() will not return before services are discovered!
So now we deal with this situation.
- the BASE_UUID is shared between all BTLE devices, not miband specific. So are the UUID DESCRIPTORS. Hence these have been moved to AbstractBTLEDeviceSupport
- the gatt-characteristic-property-constants used previously in MiBandNotifyAction are also general, and exposed by the gatt subsystem, hence the specific action has been dropped moving the logic to the NotifyAction class
- the logic for checking the gatt-characteristic-property-constants has been extended also to the ReadAction and WriteAction class, this way we won't try to read (or write) a characteristic that isn't readable (or writeable)
- model package contains mostly shared interfaces (UI+service), not named GB*
- impl package contains implementations of those interfaces, named GB*
the impl classes should not be used by the service (not completely done)
- the service classes should mostly use classes inside the service and deviceevents
packages (tbd)
Every device now has two packages:
- devices/[device name] for UI related functionality
- service[device name] for lowlevel communication
