[ndnSIM] How to get the payload of the Data packet as what it originally is

[mengxue]

Hi,all
   I am new in ndnSIM and met with some problems recently.
   Assume that I defined a class " Student " and want to attach an instantiation named " newStudent " of  the "Student" class as the payload of a Data packet.
   I wonder what should I do to set this instantiation as the payload of the Data packet so that  in other nodes  I can get the payload just as what it originally is,i.e.,"newStudent" , so that I can do some operations on the "newStudent".
I have tried on the API documentation but not found the solutions using "Data::setpayload()" and "Data::getpayload()".
  Thank you very much!
  Best regards,
  Xin Zhang
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