Also - why is openPDC in the middle here? I missed that you are using IEEE C37.118 between openPDC and openHistorian - I was assuming GEP/STTP from openPDC to openHistorian (which would be more reliable).
See the related response:
https://gridbits.gridprotectionalliance.org/t/lost-samples-when-converting-iec-to-ieee/916/3
Thanks,
Ritchie