I tried different things :
Convert tables from InnoDB to NDB (or NDBCLUSTER) fails with :
ERROR 3776 (HY000): Cannot change table’s storage engine because the table participates in a foreign key constraint.
Modifiyng storage engine from InnoDB to NDB (or NDBCLUSTER) fails :
cat /tmp/librenms_pro.sql | mysql bco
ERROR 1215 (HY000) at line 571: Cannot add foreign key constraint
So as expected there is something with foreign_keys.