The value of 280 is the minimum size needed to realize less ftdi_write_data() calls in patch 40477.

Nevertheless a value of 4096 would be reasonable as well.
In fact I can´t see any real need to set chunksize smaller than the default value (here: default equals to max) of the ftdi chunksize which equals to the ftdi buffer size (fix hardware buffer!).

A value of 4096 should result in the same behavior. However 280 is like having (/showing to have) some more control and knowledge about what happens.

I do not prefer any of the options. As there was possibly a reason to set chunksize smaller than the default value I chose 280.

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