Nucleus NET does support UDP/TCP packet fragmentation by utilizing IP fragmentation and reassembly. Support for IP fragmentation is on by default and is controlled by the INLCUDE_IP_FRAGMENT define in net_cfg.h. Set this define to OS_TRUE or OS_FALSE to enable or disable IP fragmentation support.
It is important to note that the default Maximum IP Reassembly size is set to the MTU of the device attached to NET. For Ethernet, this is 1500. This can be changed during run time by calling NU_Set_Reasm_Max_Size to specify a new maximum reassembly size.