Producer handler function.
The handler can return a Data to respond to the Interest, or return
undefined to cause a timeout.
If Options.dataBuffer is provided, the handler can access the DataBuffer via producer.dataBuffer .
The handler can return a Data to respond to the Interest, which is also inserted to the DataBuffer
unless Options.autoBuffer is set to false. If the handler returns
undefined, the Interest is used
to query the DataBuffer, and any matching Data may be sent.
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