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See Matt's page of information here: ePixHR Beam Test DAQ

BLD Data Formats

(from Matt Weaver)

Slides 4 and 9 of https://docs.google.com/presentation/d/1EwJTx_L5JNZF0mURIhxflpmzJ8p5ey6uIXqwth3gPBc/edit#slide=id.g47d26c62e9_0_29.  Kukhee has a collection of documentation here (https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=285114775).  There are also EPICS PVA records from the server that provide "static" information about the packet contents - like the field names and data types: https://github.com/slac-lcls/lcls2/blob/a9886a2768fb83028317ba854664bd424d94e386/psdaq/psdaq/app/hpsBldServer.cc#L2-L11

hpsBldServer.cc represents exactly what the IOC needs to do - receive the UDP unicasts from the ATCA board and transmit the data as UDP multicast.