if(fseek(f, 0, SEEK_END) || !(len = ftell(f)) || fseek(f, 0, SEEK_SET)) {
logger(mesh, MESHLINK_ERROR, "Cannot get config file size: %s\n", strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
if(fseek(f, 0, SEEK_END) || !(len = ftell(f)) || fseek(f, 0, SEEK_SET)) {
logger(mesh, MESHLINK_ERROR, "Cannot get config file size: %s\n", strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;