Lwip protocol: udp send returns ERR value of ERR_IF generally what causes?-CodePudding

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Lwip protocol: udp send returns ERR value of ERR_IF generally what causes?

Time：09-29

In the use of stm32F407 + lwip 1.3.1 without communication of the operating system, all of a sudden the udp send information return value has been= ERR_IF .

The ERR_IF explanation is that the underlying network interface error,

Could you tell me you return value is equal to the ERR_IF is generally what causes?

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