APDU Length error

I encountered an APDU length error while attempting to communicate with a device on the KNX bus. The error message states:

"This operation requires an APDU length of 34 bytes, but only 15 bytes are available due to the capabilities of the device."

Setup & Methods Tried:

1. Direct Connection: Connected the RCU directly to the laptop via an Ethernet cable.
2. Router Setup: Connected both the RCU and the laptop to a router via Ethernet cables and configured static IP routing.

In both cases, I was able to ping the RCU from CMD, but the APDU length limitation issue persists when communicating with the KNX device.

Additional Notes:

• I have not used any KNX IP or USB interface in this setup.

Questions:

1. Is there a way to enable extended APDU length on the RCU or KNX device?
2. Would adding a KNX IP interface or KNX USB interface help resolve this issue?
3. Is there any workaround to send longer APDUs in this setup?

Any insights or suggestions would be greatly appreciated. Thanks!