Based stm32f107 transplant lwip protocol stack, udp send data. You can learn the lwip entry as a good

UDP_send\Libraries\CMSIS\Core\CM3\core_cm3.c
........\.........\.....\....\...\core_cm3.h
........\.........\.....\....\...\startup\arm\startup_stm32f10x_cl.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_hd.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_ld.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_md.s
........\.........\.....\....\...\.......\gcc\startup_stm32f10x_cl.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_hd.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_ld.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_md.s
........\.........\.....\....\...\.......\iar\startup_stm32f10x_cl.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_hd.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_ld.s
........\.........\.....\....\...\.......\...\startup_stm32f10x_md.s
........\.........\.....\....\...\stm32f10x.h
........\.........\.....\....\...\system_stm32f10x.c
........\.........\.....\....\...\system_stm32f10x.h
........\.........\.....\....\Documentation\CMSIS_Core.htm
........\.........\.....\License.doc
........\.........\STM32F10x_StdPeriph_Driver\inc\misc.h
........\.........\..........................\...\stm32f10x_adc.h
........\.........\..........................\...\stm32f10x_bkp.h
........\.........\..........................\...\stm32f10x_can.h
........\.........\..........................\...\stm32f10x_crc.h
........\.........\..........................\...\stm32f10x_dac.h
........\.........\..........................\...\stm32f10x_dbgmcu.h
........\.........\..........................\...\stm32f10x_dma.h
........\.........\..........................\...\stm32f10x_exti.h
........\.........\..........................\...\stm32f10x_flash.h
........\.........\..........................\...\stm32f10x_fsmc.h
........\.........\..........................\...\stm32f10x_gpio.h
........\.........\..........................\...\stm32f10x_i2c.h
........\.........\..........................\...\stm32f10x_iwdg.h
........\.........\..........................\...\stm32f10x_pwr.h
........\.........\..........................\...\stm32f10x_rcc.h
........\.........\..........................\...\stm32f10x_rtc.h
........\.........\..........................\...\stm32f10x_sdio.h
........\.........\..........................\...\stm32f10x_spi.h
........\.........\..........................\...\stm32f10x_tim.h
........\.........\..........................\...\stm32f10x_usart.h
........\.........\..........................\...\stm32f10x_wwdg.h
........\.........\..........................\src\misc.c
........\.........\..........................\...\stm32f10x_adc.c
........\.........\..........................\...\stm32f10x_bkp.c
........\.........\..........................\...\stm32f10x_can.c
........\.........\..........................\...\stm32f10x_crc.c
........\.........\..........................\...\stm32f10x_dac.c
........\.........\..........................\...\stm32f10x_dbgmcu.c
........\.........\..........................\...\stm32f10x_dma.c
........\.........\..........................\...\stm32f10x_exti.c
........\.........\..........................\...\stm32f10x_flash.c
........\.........\..........................\...\stm32f10x_fsmc.c
........\.........\..........................\...\stm32f10x_gpio.c
........\.........\..........................\...\stm32f10x_i2c.c
........\.........\..........................\...\stm32f10x_iwdg.c
........\.........\..........................\...\stm32f10x_pwr.c
........\.........\..........................\...\stm32f10x_rcc.c
........\.........\..........................\...\stm32f10x_rtc.c
........\.........\..........................\...\stm32f10x_sdio.c
........\.........\..........................\...\stm32f10x_spi.c
........\.........\..........................\...\stm32f10x_tim.c
........\.........\..........................\...\stm32f10x_usart.c
........\.........\..........................\...\stm32f10x_wwdg.c
........\.........

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