add nkmcu

hc

2023-11-06 170c1c0fa90ad9f762d1877f8a57efce706fc95a

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# From http://etherlab.org/download/ethercat/ethercat-1.5.2.tar.bz2.md5
md5    6b4001f8d975865d74a0b108b3bdda3d    ethercat-1.5.2.tar.bz2