static void register_messages(void) {
gras_msgtype_declare("ping", gras_datadesc_by_name("int"));
gras_msgtype_declare("pong", gras_datadesc_by_name("int"));
static void register_messages(void) {
gras_msgtype_declare("ping", gras_datadesc_by_name("int"));
gras_msgtype_declare("pong", gras_datadesc_by_name("int"));