Undefined packet length and random data in error case

In case the request packet format is undefined, it is rejected with an error code, but the confirmation packet length is not set to a defined format. Instead, it will be mirrored back from the request. As a result, the confirmation contains random data.

Example:

EIP_OBJECT_SET_PARAMETER_REQ, defined request length = 4, confirmation length = 0.

Request Data: 01 00 00 00 00 (length 5)

Confirmation Data: undefined (length 5)