https://i56578-swl.blogspot.com/2018/01/stanag-4538-hdl-bw7-frame-structure.html
STANAG-4538, HDL+ BW7 frame structure | diario SWL I-56578 Antonio
"The HDL+ protocol is used to provide acknowledged point-to-point delivery of datagrams from a transmitting PU to a receiving PU acro...
frame structurestanaghdl