idea of sending ping on WRITER_IDLE state

[kohowski]

Greetings all!

I would appreciate if someone could clarify the idea of sending ping on
WRITER_IDLE state. I was looking through the example given in the javadoc
for IdleStateHandler class.. and stumbled at the point of ".writer (new
PingMessage())".

I wonder how sending ping can help or resolve the situation of idle writer?

Thanks in advance!

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