mt2str
const char *mt2str(enum tls13_message_type mt);
fprintf(stream, "\t\t%s,\n", mt2str(path[i]));
printf("\t%s -> %s", mt2str(start), mt2str(end));
printf("\t%s [shape=box];\n", mt2str(CLIENT_HELLO));
printf("\t%s [shape=box];\n", mt2str(APPLICATION_DATA));