You're seeing just the function
eb, go back to MLLP.Envelope module for more information.
The MLLP End-Block character. In documentation it is often represented as
eb is a single-byte character with the ASCII value 0x1C. This character is
also know as "FS (File Separator)" and may appear as
^\ in text editors.
iex> MLLP.Envelope.eb <<28>>