Hi Karol, Finally, I find out the reason why the value 0x07 (NX_PTR_ERROR : Invalid socket pointer) is returned when I use nx_udp_socket_send function， I forget to add nx_udp_socket_checksum_enable function before the udp receive and send action... And after inserting the function, my udp program works normally.... Thanks for your strong support :) @Karol ... Best Regards, feng
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