Hi all,
We have been working in a new version of the HDP D-Bus API.
It will be great to have your feedback about it, especially in some points:
- Two agents classes one for the hole application an other for each end
point.
- Signals for notifying the remote services and a property for getting
them also (Similar to the adapter API)
Regards
BlueZ D-Bus Health API description
**********************************
Santiago Carot-Nemesio <sancane@xxxxxxxxx>
José Antonio Santos-Cadenas <santoscadenas@xxxxxxxxx>
Elvis Pfützenreuter <epx@xxxxxxxxxxx>
Health Device Profile hierarchy
===============================
Service org.bluez
Interface org.bluez.HealthManager
Object path [variable prefix]/
Methods:
path RegisterApplication(object agent, dict config)
Returns the path of the new registered application. The agent
parameter is the path of the object with the callbacks to
notify events (see org.bluez.HealthApplicationAgent at the end
of this document)
This petition starts an mcap instance on every adapter and also
registers a proper record in the SDP if needed.
Dict is defined as bellow:
{
"end_points" : [{ (optional)
"agent": path, (mapped with HealthApplicationAgent)
"role" : ("Source" or "Sink"), (mandatory)
"specs" :[{ (mandatory)
"data_type" : uint16, (mandatory)
"description" : string, (optional)
"config" : ("Reliable" or "Streaming") (for Sources)
}]
}]
}
Application will be closed by the call or implicitly when the
programs leaves the bus.
Possible errors: org.bluez.Error.InvalidArguments
void UnregisterApplication(object application)
Closes the HDP application identified by the object path. Also
application will be closed if the process that started it leaves
the bus. If there is a SDP record associated to this application
it will also be removed.
Possible errors: org.bluez.Error.InvalidArguments
org.bluez.Error.NotFound
void UpdateServices()
This method searches for HDP applications on the all remote
devices and notifies them to the appropriate agents.
dict GetProperties()
Returns all properties for the interface. See the
properties section for available properties.
Properties:
array Services (read only)
An array with the paths of all the services.
Signals:
void ServiceDiscovered(object service)
This signal is sent when a device containing an HDP
application is paired or when the method Update of the
HealthManager is called and new HealthServices are discovered.
The object path is the HealthService path. The signal will be
sent once for each HealthService.
void ServiceRemoved(object service)
This signal is sent if during an Update some HealthServices
have disappeared. The signal is sent once for each removed
HealthService.
--------------------------------------------------------------------------------
Service org.bluez
Interface org.bluez.HealthService
Object path [variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/hdp_YYYY
Methods:
dict GetProperties()
Returns all properties for the interface. See the properties
section for available properties.
boolean Echo(string app, array{byte})
Sends an echo petition to the remote service. Returns True if
response matches with the buffer sent. If some error is detected
False value is returned and the associated MCL is closed.
object OpenDataChannel(string app, string end_point, string conf)
Creates a new data channel with the indicated config to the
remote MCAP Data End Point.
The configuration should indicate the channel quality of
service using one of this values "Reliable", "Streaming", "Any".
Returns the object path that identifies the data channel.
Possible errors: org.bluez.Error.InvalidArguments
org.bluez.Error.HealthError
void DeleteAllDataChannels(string app)
Deletes all data channels so they will not be available for
future use.
Possible errors: org.bluez.Error.HealthError
Properties:
array EndPoints (read only)
An array with all the end points in this Service. Each one of
then has this format.
{
"end_point": string,
"role" : "source" or "sink" ,
"specs" : [{
"dtype" : uint16,
"description" : string, (optional)
}]
}
--------------------------------------------------------------------------------
Service org.bluez
Interface org.bluez.HealthDataChannel
Object path [variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/
hdp_YYYY/channel_ZZ
Methods:
dict GetProperties()
Returns all properties for the interface. See the properties
section for available properties.
fd Acquire()
Returns the file descriptor for the data channel_ZZ
Possible errors: org.bluez.Error.NotConnected
void Remove()
Closes the data channel and no other future uses will be
possible. This object will be also removed.
void Reconnect()
Reconnects the data channel.
Properties:
string QualityOfService (read only)
The quality of service of the data channel.
boolean Connected (read only)
True if the data channel is connected
HealthApplicationAgent hierarchy
================================
(this object is implemented by the HDP user in order to receive notifications)
Service unique name
Interface org.bluez.HealthApplicationAgent
Object path freely definable
Methods:
void Release()
This method gets called when the service daemon unregisters the
agent. An agent can use it to do cleanup tasks. There is no need
to unregister the agent, because when this method gets called it
has already been unregistered.
void DataChannelRemoved(object service, string data_channel)
This method is called when a data channel is deleted.
After this call the data channel path will not be valid and can
be reused for future creation of data channels.
HealthEndPointAgent hierarchy
================================
(this object is implemented by the HDP user in order to receive notifications)
Service unique name
Interface org.bluez.HealthEndPointAgent
Object path freely definable
Methods:
void Release()
This method gets called when the service daemon unregisters the
agent. An agent can use it to do cleanup tasks. There is no need
to unregister the agent, because when this method gets called it
has already been unregistered.
void DataChannelCreated(string data_channel, boolean reconnection)
This method is called when a new data channel is created.
The service parameter contains the object path of the
HealthService that created the connection, data_channel is
the string that identifies the data channel, conf is the quality
of service of the data channel ("reliable" or "streaming"),
file_descriptor the file descriptor for reading and writing
data and reconnection indicates if it is a reconnection or a
data channel creation.
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