Send a chunk of file data to a friend.
This function is called in response to the `file_chunk_request` callback. The length parameter should be equal to the one received though the callback. If it is zero, the transfer is assumed complete. For files with known size, Core will know that the transfer is complete after the last byte has been received, so it is not necessary (though not harmful) to send a zero-length chunk to terminate. For streams, core will know that the transfer is finished if a chunk with length less than the length requested in the callback is sent.
| friend_number |
The friend number of the receiving friend for this file. |
| file_number |
The file transfer identifier returned by Tox.file_send. |
| position |
The file or stream position from which to continue reading. |
|
true on success. |