Хм.. пакетик прилетает в процессе удаления блока? Натыкал печать адресов, штатные ситуации поскипал на "..........."
Read PHY ID (LAN8720) - OK
pcb=2000094C, upcb=2000094C, send - 0, UDP: 0
de-allocated 1
pcb=2000094C, upcb=2000094C, send - 0, UDP: 1
de-allocated 1
..........................
de-allocated 1
pcb=2000094C, upcb=2000094C, send - 0, UDP: 23
de-allocated 1
pcb=2000094C, upcb=2000094C, send - 0, UDP: 24
pcb=2000092C, upcb=2000092C, send - 0, UDP: 24
pcb=2000090C, upcb=2000090C, send - 0, UDP: 24
de-allocated 1
pcb=2000090C, upcb=2000090C, send - 0, UDP: 25
de-allocated 1
pcb=2000090C, upcb=2000090C, send - 0, UDP: 26
de-allocated 1
........................
de-allocated 1
pcb=2000090C, upcb=2000090C, send - 0, UDP: 46
de-allocated 1
pcb=2000090C, upcb=2000090C, send - 0, UDP: 47
pcb=200008EC, upcb=200008EC, send - 0, UDP: 47
pcb=200008CC, upcb=200008CC, send - 0, UDP: 47
de-allocated 1
pcb=200008CC, upcb=200008CC, send - 0, UDP: 48
de-allocated 1
pcb=200008CC, upcb=200008CC, send - 0, UDP: 49
de-allocated 1
.....................
de-allocated 1
pcb=200008CC, upcb=200008CC, send - 0, UDP: 68
de-allocated 1
pcb=200008CC, upcb=200008CC, send - 0, UDP: 69
de-allocated 1
pcb=200008CC, upcb=200008CC, send - 0, UDP: 70
pcb=200008AC, upcb=200008AC, send - 0, UDP: 70
memp_malloc: out of memory in pool UDP_PCB
pcb=0, problem in udp_new()
upcb=0,
can not create udp pcbmemp_malloc: out of memory in pool UDP_PCB