C program for capturing AnswerRequested signal

["Pedro Vivancos" <pedro.vivancos@xxxxxxxxxx>]

Dear friends,

I wrote a C program to capture the "AnswerRequested" signal from a bluetooth headset but it doesn't work. It is based on the DeviceDiscover Howto of the wiki audio section but it doesn't do anything.

Can you help me to find the error?

Thanks in advance

/* Build with: */
/* glib-genmarshal --prefix=marshal marshal.list --header > marshal.h */
/* glib-genmarshal --prefix=marshal marshal.list --body > marshal.c */
/* gcc `pkg-config --libs --cflags glib-2.0 dbus-1 dbus-glib-1` bluetooth.c marshal.c -o bluetooth */

#include <stdlib.h>
#include <dbus/dbus.h>
#include <dbus/dbus-glib.h>
#include <glib-object.h>

#include "marshal.h"

static GMainLoop *loop = NULL;

static void answer_requested(DBusGProxy *object, gpointer user_data)
{
        g_print("Signal: AnswerRequested()\n");
}


static void run_mainloop (void)
{
        GMainContext *ctx;

        ctx = g_main_loop_get_context (loop);

        while (g_main_context_pending (ctx))
                g_main_context_iteration (ctx, FALSE);
}

int main(int argc, char* argv[])
{
        GError *error = NULL;
        DBusGConnection * bus = NULL;
        DBusGProxy * obj = NULL;

        g_type_init();
        g_log_set_always_fatal (G_LOG_LEVEL_WARNING);
        loop = g_main_loop_new (NULL, FALSE);

        bus = dbus_g_bus_get(DBUS_BUS_SYSTEM, &error);
        if (error != NULL)
        {
                g_printerr("Connecting to system bus failed: %s\n", error->message);
                g_error_free(error);
                exit(EXIT_FAILURE);
        }
        
        // o probar con /org/bluez/audio
        obj = dbus_g_proxy_new_for_name(bus, "org.bluez", "00:16:94:03:60:1B", "org.bluez.audio.Headset");

        dbus_g_proxy_add_signal(obj, "AnswerRequested", G_TYPE_INVALID);
        dbus_g_proxy_connect_signal(obj, "AnswerRequested", G_CALLBACK(answer_requested), bus, NULL);

        run_mainloop ();
        dbus_g_connection_flush (bus);
        g_main_loop_run (loop);
        dbus_g_connection_unref(bus);

        return 0;
}

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