In the upcoming beta release of Chrome OS (which uses BlueZ as its Bluetooth stack) we have implemented the chrome.bluetoothLowEnergy JavaScript API for Chrome browser applications (https://developer.chrome.com/apps/bluetoothLowEnergy). For Chrome OS, we wrote an implementation of the proposed GATT D-Bus API for bluetoothd, during which we ran into some issues with the current proposal and changed things up a bit. This set includes one patch that proposes changes for the currently unimplemented GATT D-Bus API for desktop bluetoothd. The following changes are proposed: * The addition of the following new properties: - org.bluez.GattService1: "Primary", "Device", "Characteristics" - org.bluez.GattCharacteristic1: "Notifying", "Descriptors" While all characteristic and descriptor objects become available via ObjectManager as soon as they get discovered, the "Characteristics" and "Descriptors" properties of service and characteristic objects do not get set until all characteristics and descriptors of a service have been discovered. This is used to let applications know that discovery of a service is complete and that the service is ready to interact with. * Removal of the "Permissions" property from org.bluez.GattDescriptor1. * Removal of the "Value" property from org.bluez.GattCharacteristic1 and GattDescriptor1. The introduction of the following asynchronous methods and signals: - ReadValue method, which always reads the value of a characteristic or descriptor from the remote device and returns the result asynchronously. This removes the problems of the org.freedesktop.DBus.Properties.Get method when the value is implemented as a property: -- The Get and GetAll methods are synchronous. This causes problems when a round-trip is required to obtain the value from the remote device. -- The ambiguity involved in the role of Get/GetAll when a characteristic doesn't support reads. Some characteristics are only writable and some make their values known via notifications and not reads. - WriteValue method, which is used to write the value of a characteristic or descriptor. - ValueUpdated signal, emitted when a characteristic notification or indication is received. * Addition of the StartNotify and StopNotify methods to org.bluez.GattCharacteristic1. This allows multiple applications to enable notifications from a characteristic without interfering with each other and applications are not permitted to directly write to the "Client Characteristic Configuration" descriptor. Arman Uguray (1): doc/gatt-api: New API properties and methods for the GATT D-Bus API. doc/gatt-api.txt | 118 ++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 104 insertions(+), 14 deletions(-) -- 2.0.0.526.g5318336 -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
