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UDP connection based on CMSIS library

Hello,

I need to send a UDP package with this function( netUDP_Send )

https://www.keil.com/pack/doc/mw/Network/html/group__udp__user__api.html#ga7a82db98b82300e5fd03ce1b7afb6cba

But I don't have remote IP and Port number.  I have added a new variable to get remote IP and Port number but it shows me an error.

NET_ADDR4 addrUDP;

uint32_t udp_cb_func (int32_t socket, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) {
    addrUDP=addr;
    return 0;
}

How can I send a UDP package?

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