Hello, I am a newbie to networking and managed to port lwip stack to LPC17xx controller runninf freertos. I have requirement to send UDP data to a static destination IP Address.
I have a task which tries to send a UDP Packet every one second. When I send data via broadcast, it works. udp_sendto(pcb, pb,IP_ADDR_BROADCAST,1235) Also from my PC if I ping to my board it all works fine But if I try to send data to a specific ip address (that of my PC) then it doesn;t work udp_sendto(pcb, pb,&destinationAddress,1235) Also I niotice that ping stop working. If I follow existing example of UDP Echo, i.e. connect to an IP and port for UDP udp_connect(pcb, &destinationAddress, pc_port); and in callback of receive message, I send UDP packet it works. udp_recv(pcb, udp_echo_recv, NULL); In my call back static void udp_echo_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port) { udp_send(pcb, p); pbuf_free(p); } I thought UDP is connectionless and sending UDP Data to a given IP Address and Port shuld simply work. Can you please let me know what I am doing wrong here. -- Sent from: http://lwip.100.n7.nabble.com/lwip-users-f3.html _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users