This patch forces emitting PropertiesChanged signal when the descriptor
Value changes. Internally, BlueZ tracks the signal emitted to update
the GDBusProxy properties.
This patch adds properties to Alert Level characteristic of the
Immediate Alert Service. IAS specification defines Write Without
Response as mandatory.
This patch extends gatt-service tool, emitting PropertiesChanged for
"Value" when a new value is set. This flow represents the handling of
ATT Write Command or Write Request which is translated to a GDBusProxy
set property. PropertiesChanged will be tracked by the characteristic
GDBusProxy in order to detect "Value" changes.
This patch extends the gatt-service.c example adding a generic callback
to allow set the characteristic Value. It doesn't check for
characteristic properties yet.
This patch extends the gatt-service.c example adding the callback to
allow reading the Value property. At the moment, it is a generic
callback and it doesn't consider characteristic value property
restrictions.
