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TM4C1294NCPDT: Meaning of PKT_NUM_FRAMEBUF in TI-RTOS

Part Number: TM4C1294NCPDT

Hi Team,

We have received this inquiry from our customer,

have a question that what does the struct PKT_NUM_FRAMEBUF mean in TI-RTOS. 
I make an application just for udp communication, in the beginning it works normally,about 2 hours later,i can only send messages out, but can not receive any data.
when i change PKT_NUM_FRAMEBUF to 100, it can work for longer time. at the same time ,i can't ping it using my PC. likes the connection is lossed
maybe need i free the buffer by myself after using it?

Regards,

Danilo