OptionalchecksumWhether to compute and verify a SHA-256 checksum for this transfer.
OptionalchunkPayload bytes per chunk (excluding the frame header).
OptionalhighData-channel bufferedAmount (bytes) at which the sender pauses to apply backpressure.
OptionallowbufferedAmountLowThreshold (bytes) at which the paused sender resumes.
OptionalofferMilliseconds a sender waits for the receiver to accept an offer before the
transfer fails (releasing its open channels). 0 disables the timeout.
OptionalparallelNumber of parallel binary data channels opened per transfer; chunks are striped across them.
OptionaltransferExplicit transfer id; a random id is generated when omitted.
Per-send overrides accepted by FileTransferManager.sendFile; merged over the manager defaults.