Hi..As always I have checked any thread having something to do with this, and
the only one I found was related to old lwip 0.5 whileI am using lwip 1.2 and
things are running very2 well accept for this slight weird problem. I am using
the socket API sending some dummypackets to a UDP echo server I setup on the
other node. The sending went well except for I am having UDP checksum error.
This didnt happen for TCP.I used DHCP, which uses UDP directly, and DHCP works
fine. So it kinda awkard to me that my short client having this problem.Any
ideas would be welcomed. Following is a piece of the client code. My platform
is MPC852T running SMX RTOS.I also attached the wireshark trace. Thanks a lot
in advance.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)); (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); char* dummy_data =
(char*)mallocx(12); for(int i =0 ; i<12;i++) dummy_data[i]= '2';
while(1){ lwip_sendto(socket_index,(void*)dummy_data,12,0,(struct
sockaddr*)endpoint,addrlen);
WaitForSingleObject(suspend_udp,SMX_MSEC_TO_TICKS(10)); }}
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udp_checksum error.pcap
Description: Binary data
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