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flush() semantics have changed #469

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m-mcgowan opened this issue Jun 28, 2015 · 1 comment

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@m-mcgowan
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commented Jun 28, 2015

At present, the flush() semantics discards any unread data. This was the behavior in very old versions of Arduino. Now, flush() is a virtual method on the Stream class with different semantics:

https://www.arduino.cc/en/Reference/StreamFlush

Calling flush() should block the caller until all the data has been sent. No data is discarded.

https://www.arduino.cc/en/Serial/Flush

Classes affected:

  • Serial
  • UDP
  • TCPClient

To emulate the older behavior and discard unread data, clients can simply call read() in a loop until there is no more data to read.

@m-mcgowan m-mcgowan added this to the 0.4.10 milestone Jan 29, 2016

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commented Mar 14, 2016

@avtolstoy - could you take a look at this please.

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