ret = g_dbus_proxy_call_sync(proxy, "Set",
g_variant_new("(ssv)", BT_PROXIMITY_MONITOR_INTERFACE, property_str, g_variant_new("s", value_str)),
ret = g_dbus_proxy_call_sync(proxy, "Set",
g_variant_new("(ssv)", BT_PROXIMITY_MONITOR_INTERFACE, property_str, g_variant_new("s", value_str)),