Muhamad Ikhwan Ismail wrote:
> I am using the socket API sending some dummy
> packets to a UDP echo server I setup on the other node. The sending went
> well except for I am having UDP checksum error.
See comments below.
> void test_udp_socket(void){
> int socket_index;
>
> SCB_PTR suspend_udp; //semaphore used to suspend the thread
> suspend_udp = create_sema(1);
>
> socket_index = lwip_socket(AF_INET,SOCK_DGRAM,0x00);
>
> /*now get a sockaddr structure corresponding to socket domain AF_INET */
> struct sockaddr_in* endpoint = (struct
> sockaddr_in*)mallocx(sizeof(struct sockaddr));
At this point you should probably memset the contents of sockaddr_in to 0
(unless your mallocx does .
> (endpoint)->sin_family = AF_INET;
> (endpoint)->sin_port = (htons(7));
> struct ip_addr server_ip;
> IP4_ADDR(&server_ip,169,254,36,145);
> (endpoint)->sin_addr.s_addr = server_ip.addr;
> int addrlen = (endpoint)->sin_len = sizeof((endpoint)->sin_addr.s_addr);
The above line is wrong. You need addrlen to be sizeof(endpoint).
NB, there's no need to set sin_len - it exists only for compatibility with
other stacks, and isn't even part of the POSIX standard any more.
Jifl
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