toJson method
Implementation
Map toJson(){
Map result = {};
if (data != null) result.addAll({"data": data});
if (auxPCD != null) result.addAll({"auxPCD": auxPCD});
if (challengePICC != null) result.addAll({"challengePICC": challengePICC});
if (hashPK != null) result.addAll({"hashPK": hashPK});
if (idPICC != null) result.addAll({"idPICC": idPICC});
return result;
}