Block transfer not working

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Sending a message in blocks
2.
3.

What is the expected output? What do you see instead?
I send a 256 byte message with a maximum block size set at 64. Wireshark 
captures only 1 UDP packet instead of 4.

What version of the product are you using? On what operating system?
Latest from GIT. OS X 10.8.

Please provide any additional information below.
Can you please provide me information if the block transfer is already working? 
I am trying to figure out the code behind it, but if it doesn't work yet a 
simple yes or no will save me a lot of work trying it out :). If I have time 
left besides my own project I might try to implement the block wise transfer.

Thanks!

Original issue reported on code.google.com by [email protected] on 12 Mar 2014 at 1:10