NETIP_TUNNELING_SOCKET; Received Telegram: <KNX-group-address>@<IP-address> from <KNX-phys-address> has different data size as defined (defined:<x>, received:<y>).

Error Message	NETIP_TUNNELING_SOCKET; Received Telegram: <KNX-group-address>@<IP-address> from <KNX-phys-address> has different data size as defined (defined:<x>, received:<y>).
Related Products	BMS Server 2.0, BMS Platform, MP Server
Description	The BMS Server has received a telegram from the field that does not match the respective definition regarding the length of the data.
Causes	The expected data size as defined in KNX / Telegram definitions does not match the received number of octets as sent by the device. There are multiple reasons for this issue: The imported ETS project is not correct or outdated. There is a KNX device which is not configured correctly or which is not part of the ETS project. Multiple ETS projects are used in the building but KNXnet/IP routing is activated and the same multicast address is used in all projects.
Resolutions	Make sure the group address is properly configured in the ETS and choose a matching data size and type in KNX / Telegram definitions. Ensure that all KNX devices are programmed correctly. Ensure that there is no KNX device connected to the bus that is not part of ETS. Ensure that different ETS project are using different KNXnet/IP multicast addresses.