Snapex7.Client.set_session_password

You're seeing just the function set_session_password, go back to Snapex7.Client module for more information.
Link to this function

set_session_password(pid, password)

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Specs

set_session_password(GenServer.server(), bitstring()) ::
  :ok | {:error, map()} | {:error, :einval}

Send the password (an 8 chars string) to the PLC to meet its security level.