Hi Zhenhua,

> +	if (g_str_equal(property, "Online") == TRUE) {
> +		const char *path = dbus_message_get_path(msg);
> +		struct ofono_modem *modem;
> +		struct ofono_atom *gprs;
> +		gboolean online;
> +
> +		if (!dbus_message_iter_next(&iter))
> +			return FALSE;
> +
> +		if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)
> +			return FALSE;
> +
> +		dbus_message_iter_recurse(&iter, &var);
> +
> +		dbus_message_iter_get_basic(&var, &online);
> +
> +		if (online == FALSE) {
> +			bluetooth_unregister_server(server);
> +			server = NULL;
> +			goto done;
> +		}
> +
> +		/* Create DUN server */
> +		modem = ofono_modem_get_modem_by_path(path);
> +		gprs = __ofono_modem_find_atom(modem,
> +						OFONO_ATOM_TYPE_GPRS);
> +		/* Make sure the modem has GPRS atom */
> +		if (!gprs)
> +			goto done;
> +
> +		server = bluetooth_register_server(DUN_GW,
> +				"Dial-Up Networking", DUN_GW_CHANNEL,
> +				dun_gw_connect_cb, modem);
> +	}
> +
> +done:
> +	return TRUE;
> +}

Please don't do it this way.  Instead add a new modem_state_watch
function to modem.c for accomplishing this.

Regards,
-Denis