Hi everyone,
I'm currently writing my master thesis on the topic of Architecture Mining for S7 machines through analysis of pcap files. Therefore I'm already able to retrieve all the fields for request and response messages (S7ParameterReadVarRequest tells me the read request was for DB444:0.0:REAL and the corresponding S7ParameterReadVarResponse contains the answer as data item S7VarPayloadDataItem). Now I'm stuck at the point where I've got a byte array as returned by item.getData() . How is it possible to convert this byte[] to the concrete value of that DB, if the type is known (item.getTransportSize() returns a DataTransportSize e.g. REAL, NULL etc.) I want: data of response as byte[] "41 dd bf 4e" of type REAL --> concrete value: e.g. 123,456 I've had a look at the mechanism when actively reading a S7 DB e.g. via HelloPlc4x example . Within S7ProtocolLogic.java a private function (PlcValue parsePlcValue(S7Field field, ByteBuf data)) is used : return DataItemIO.staticParse(readBuffer, field.getDataType().getDataProtocolId(), stringLength) Unfortunately in my case I don't have all the parameters. My data types REAL, NULL, .. are types enum DataTransportSize not enum TransportSize, so there is no protocolId. Is there any way to make use of this function or do you have any other idea how to convert the bytes ? I would really appreciate any help in this. Thanks! Best, Anja Hager
