This is also based on my previous experimentation.
There may be a valid use-case to allow for the Agent to be a separate
process. However, there needs to be a way to designate the BusName of
the connection from the other Agent process to the System bus.
For RegisterAgent and CreatePairedDevice, the syntax of the Object Path
is simply "/net/frequencyone/authorize", which defaults to an object in
the same process and using the process'es connection to the system bus.
I thought that one might incorporate the Bus Name/connection name into
the Object Path. For example, one might say:
"net.frequencyone:/net/frequencyone/authorize", which would point the
bus name to "net.frequencyone", and the object would be attached to that
"well-known name" (i.e., "net.frequencyone").
Alternatively, one might enter:
":1.57:/net/frequencyone/authorize", which would reference the unique
connection name and the object path. This would raise a problem with
passing the current unique connection name from the agent to the
application. Unless there was some way to search the System bus for
connections providing a given Object Path, or the unique name was shared
via a pipe or shared memory, this would probably not be a great
approach, but would still be within the realm of possibility.
However, in either case, the fact remains that the alternative formats
do not confirm to the standard for a DBUS_TYPE_OBJECT_PATH, or its Glib
binding version: DBUS_TYPE_G_OBJECT_PATH.
If it appears that this is a desirable added functionality (providing
for the Agent as an external process), we might provide for it by
additional definitions for the RegisterAgent and CreatePairedDevice
methods of Adapter. For example:
static GDBusMethodTable adapter_methods[] = {
...
{ "CreatePairedDevice", "sos", "o", create_paired_device,
G_DBUS_METHOD_FLAG_ASYNC},
{ "CreatePairedDevice", "soss", "o", create_paired_device_ext,
G_DBUS_METHOD_FLAG_ASYNC},
...
{ "RegisterAgent", "os", "", register_agent },
{ "RegisterAgent", "oss", "o", register_agent_ext},
...
}
A proxy call to call the RegisterAgent method might look like the
following:
dbus_g_proxy_call(dHciObj, "RegisterAgent", &gError,
DBUS_TYPE_G_OBJECT_PATH, "/net/frequencyone/authorize,
G_TYPE_STRING, "NoInputOutput",
G_TYPE_STRING, "net.frequencyone",
G_TYPE_INVALID,
G_TYPE_INVALID)
In the unique connection name case, it might be:
dbus_g_proxy_call(dHciObj, "RegisterAgent", &gError,
DBUS_TYPE_G_OBJECT_PATH, "/net/frequencyone/authorize,
G_TYPE_STRING, "NoInputOutput",
G_TYPE_STRING, ":1.57",
G_TYPE_INVALID,
G_TYPE_INVALID)
Of course, if the Agent code is registered and contained within the
current process, the call would remain:
dbus_g_proxy_call(dHciObj, "RegisterAgent", &gError,
DBUS_TYPE_G_OBJECT_PATH, "/net/frequencyone/authorize,
G_TYPE_STRING, "NoInputOutput",
G_TYPE_INVALID,
G_TYPE_INVALID)
Any comments, including the basic questions around whether this should
be done at all?
David Stockwell
Frequency One
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Hi David,
> There may be a valid use-case to allow for the Agent to be a separate
> process. However, there needs to be a way to designate the BusName of
> the connection from the other Agent process to the System bus.
I really have no idea what you are talking about. The agent can always
be a separate process. The agent for CreatePairedDevice must be the same
process as the caller. That is on purpose.
Regards
Marcel
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