Error Messages reading SDO Etherlab-EthercatMaster1.6

[NilsLo]

By Reading SDOs 3 Errors occure:

1. Wrong IOCTL-VERSION_MAGIC
   It is required to Set IOCTL_VERSION_MAGIC to 37 insted 31 in ec_master_async_io.hpp
2. SDO-Read: Operation not Permitted
   In examples of IGH
   master.open(EcMasterAsync::ReadWrite); is used in upload function.
3. Reading data as string: Failed to upload SDO: No buffer space available
   IGH uses

  if (data_type->byteSize){
    data.target_size = data_type->byteSize;
  } else{
    data.target_size = DefaultBufferSize;
  }
  data.target = new uint8_t[data.target_size + 1];

in upload function file ethercat_sdo_srv_server.cpp

with default buffer size:

const int  DefaultBufferSize= 64 * 1024;

defined in data_convertion_tools.hpp

[ibrahimsel]

For 1. you could refer to #134