IdleStateHandler needs to provide three parameters:
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readerIdleTimeSeconds, read timeout. That is, when no data is read from the Channel within the specified event interval, an IdleStateEvent event of READER_IDLE will be triggered.
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writerIdleTimeSeconds, write timeout. That is, when no data is written to the Channel within the specified event interval, an IdleStateEvent event of WRITER_IDLE will be triggered.
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allIdleTimeSeconds, read/write timeout. That is, when there is no read or write operation within the specified event interval, an IdleStateEvent event of ALL_IDLE will be triggered.
Get client IP
(InetSocketAddress)ctx.channel.remoteAddress
String clientIP = insocket.getAddress().getHostAddress();