proximity: link loss: implement link loss server The profile is implemented in linkloss.[ch]. A GATT service is registered with read/write callbacks on the link-loss alert level attribute. The alert level is maintained per device. It is returned on read and updated on write. When the alert level is non-zero, a callback is registered on the disconnection of the remote device. If a device with non-zero alert state is disconnected, an appropriate PropertyChanged signal is emitted with the alert level previously set by the device. We avoid emitting a signal when the disconnection was requested by us.

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4 files changed, 368 insertions(+), 40 deletions(-)