STM32 Ethernet DMA tranmit problem

[wxian.3]

Dear:

I use stm32f407+ lwip as tcp server, then the client request freq with 30Hz ,

the server will not reply after a time , then the client will retransmittion after 200 ms(see 1.png,3.png)​,

but the data is added to Ethernet DMA, TxBuff(see 2.png), so I think the Ethernet DMA has some problem when I send,

Please help me ,it bother me a few days,many thanks!

[wxian.3]

I used HAL 1.7.4 version

[Piranha]

https://community.st.com/s/question/0D50X0000BOtfhnSQB/how-to-make-ethernet-and-lwip-working-on-stm32