dbus message not received at client from server

[Anitha Chandrasekar]

Hi All,

As said below,
`dbus_connection_set_dispatch_status_function` is only called if the status is changed

Here the " dispatch_status" callback is set calling, dbus_connection_set_dispatch_status_function(conn, dispatch_status,        NULL, NULL);

we see that this callback is not being called, even when the data is available. This happens only in certain case, rest of time this code is working fine.

(Since we see that using dbus-monitor that the message is sent , but this status has not changed
dbus-monitor logs->
error time=1509954378.310314 sender=:1.3 -> destination=:1.12 error_name=org.bluez.Error.Failed reply_serial=52
   string "Not connected" ).

-> Please refer to this link(sample reference code of gdbus library of bluez stack),
https://kernel.googlesource.com/pub/scm/bluetooth/bluez/+/5.9/gdbus/mainloop.c

Any idea why this status callback not called, even when the message is sent from dbus sender?

Regards,
Anitha

________________________________________
From: dbus [dbus-bounces at lists.freedesktop.org] on behalf of Calvin Lee [cyrus296 at gmail.com]
Sent: Tuesday, November 21, 2017 9:05 PM
To: dbus at lists.freedesktop.org
Subject: Re: dbus message not received at client from server

Anitha,
I'm not sure if I can fix your problem with the information given, but
I'll try to help out. Setting up DBus to be asynchronous requires more
than using `dbus_connection_set_dispatch`. First, both DBusWatch[1] and
DBusTimeout[2] must be honored. Second, the
`dbus_connection_set_dispatch_status_function` is only called if the
status is changed, it does not dispatch anything. In order to dispatch
one must call `dbus_connection_dispatch` as many times as needed. See my
implementation below:
```C static bool should_dispatch = true;
static void dispatch_status(DBusConnection *connection,
DBusDispatchStatus new_status,
                void *_data) {
        if (new_status == DBUS_DISPATCH_DATA_REMAINS) {
                should_dispatch = true;
         }
}
void dispatch_dbus() {
        if (!should_dispatch || !conn) {
                return;
        }
        DBusDispatchStatus status;
        do {
                status = dbus_connection_dispatch(conn);
        } while (status == DBUS_DISPATCH_DATA_REMAINS);
        if (status != DBUS_DISPATCH_COMPLETE) {
                log(L_ERROR, "Cannot dispatch dbus events: %d", status);
        }
        should_dispatch = false;
}
```
I call `dispatch_dbus` each time the main loop runs.
Also `dispatch_status` is the callback to
`dbus_connection_set_dispatch_function`.

Best of luck with your project, if you need any more help please reply
with more information.

Regards,
Calvin

[1]https://dbus.freedesktop.org/doc/api/html/group__DBusWatch.html
[2]https://dbus.freedesktop.org/doc/api/html/group__DBusTimeout.html
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