Emit signal is not happening in bluez dbus - c

Question

I wrote some basic code to access the "start inquiry" bluez functionality by using dbus api's. Start Inquiry is happening that I could saw on hcidump. But I am not receiving any signal from the dbus which is "DeviceFound". I have tried lot. I tried to use different dbus tools like d-feet, dbus-monitor, bustle but I couln't got any clue.
Below is my written code. Anyone please tell me why this code is not working.
#include <stdio.h>
#include <stdlib.h>
#include <dbus/dbus.h>
#include <glib.h>
struct generic_data {
unsigned int refcount;
GSList *interfaces;
char *introspect;
};
static void unregister(DBusConnection *connection, void *user_data)
{
}
static DBusHandlerResult filter_func(DBusConnection *connection,
DBusMessage *message, void *user_data)
{
printf("Signal is called \n");
if (dbus_message_is_signal(message, "org.bluez.Adapter",
"DeviceFound"))
{
const char *adapter, *bdaddr;
char *name;
DBusMessageIter iter;
dbus_message_iter_init(message, &iter);
dbus_message_iter_get_basic(&iter, &bdaddr);
printf("Finally found device address is %s\n", bdaddr);
}
}
static DBusObjectPathVTable generic_table = {
.unregister_function = unregister,
.message_function = filter_func,
};
int main(int argc, char **argv) {
DBusConnection *conn;
DBusError error;
DBusMessage *msg, *reply,*signal;
dbus_bool_t hcid_exists,start;
DBusMessageIter reply_iter;
const char *name,*address;
char *adapter, *match;
DBusMessageIter iter;
struct generic_data *data;
va_list var_args;
static GMainLoop *loop = NULL;
conn = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
dbus_error_init(&error);
hcid_exists = dbus_bus_name_has_owner(conn, "org.bluez", &error);
if(hcid_exists)
printf("good news hurrey\n");
/* Get the default adapter */
msg = dbus_message_new_method_call("org.bluez", "/", "org.bluez.Manager", "DefaultAdapter");
if (msg == NULL) {
dbus_connection_unref(conn);
return FALSE;
}
reply = dbus_connection_send_with_reply_and_block(conn, msg, -1, &error);
dbus_message_unref(msg);
if (dbus_error_is_set(&error))
{
dbus_connection_unref(conn);
}
dbus_message_iter_init(reply, &reply_iter);
if (dbus_message_iter_get_arg_type(&reply_iter) != DBUS_TYPE_OBJECT_PATH)
{
dbus_message_unref(reply);
dbus_connection_unref(conn);
return FALSE;
}
dbus_message_iter_get_basic(&reply_iter, &adapter);
adapter = g_strdup(adapter);
//printf("Ohhhh gooood finally got adapter name %s\n",adapter);
dbus_message_unref(reply);
data = g_new0(struct generic_data, 1);
if (!dbus_connection_register_object_path(conn,adapter,&generic_table, data)) {
g_free(data->introspect);
g_free(data);
return FALSE;
}
if (!dbus_connection_add_filter(conn, filter_func, data, g_free))
{
g_free(adapter);
dbus_connection_unref(conn);
return FALSE;
}
if(conn!=NULL)
msg = dbus_message_new_method_call("org.bluez",adapter,"org.bluez.Adapter", "StartDiscovery");
else
printf("conn is failed\n");
if(msg!=NULL)
start = dbus_connection_send_with_reply(conn, msg,NULL,-1);
else
printf("msg is failed\n");
if(start)
{
//printf("Main llop hasd tp start\n");
loop = g_main_loop_new(NULL, TRUE);
g_main_loop_run(loop);
}
dbus_message_unref(msg);
dbus_message_unref(reply);
dbus_connection_close(conn);
return 0;
}