W5500 Broadcast Server

Question

Tried many days for UDP-Broadcast function and no success… The Hardware: TI-C2000 DSP + W5500. The function (from GitHub - Wiznet/ioLibrary_Driver: ioLibrary_Driver can be used for the application design of WIZnet TCP/IP chips as W5500, W5300, W5200, W5100 W5100S.) works good for DHCP and TCP after minimal adjustment. DHCP can get a free IP from sub-net (eg. 192.168.178.22) PC can send/recieve data with DSP via TCP. In order to know the IP address, PC sends Broadcast to address like: 192.168.178.255. The Problem is how to configure the W5500 to response? (already tried the function loopback_udps()) Any example for that? Thanks!

Eugeny · Answer

zhang: Tried many days for UDP-Broadcast function and no success… To receive broadcast packets in UDP mode you must ensure to reset BCASTB of Sn_MR. However it is a good question if W5500 supports 192.168.178.255 to be broadcast address for network 255.255.255.0 - I did not try it. But should work this way. zhang: The Problem is how to configure the W5500 to response? (already tried the function loopback_udps()) What do you want W5500 to respond with? And UDP broadcast does also have the UDP port #.

zhang · Answer

Thanks for the quick answer! I believe that it must be a trivial error But difficult to figure out why getSn_RX_RSR(UDP_SOCK_NR) always returns zero. Below is the C Code for testing: any idea ? #define UDP_SOCK_NR 0 #define TCP_SOCK_NR 1 #define DHCP_SOCK_NR 2 #define TCP_PORT 51000 #define UDP_PORT 51000 #define UDP_FLAG Sn_MR_BCASTB wiz_NetInfo gWIZNETINFO = { .mac = {0x00, 0x08, 0xdc, 0xab, 0xcd, 0xef}, // just for testing .ip = {192, 168, 178, 2}, .sn = {255, 255, 255, 0}, .gw = {192, 168, 178, 1}, .dns = {0, 0, 0, 0}, .dhcp = NETINFO_DHCP }; void eth_init(void) { … ctlnetwork(CN_SET_NETINFO, (void*) &gWIZNETINFO); wizchip_sw_reset(); socket(TCP_SOCK_NR, Sn_MR_TCP, TCP_PORT, 0x00); while(getSn_SR(TCP_SOCK_NR) != SOCK_INIT); { u8 inaddr_any[4]={0, 0, 0, 0}; // also tried 192.168.178.255, 255.255.255.255 setSn_DIPR(UDP_SOCK_NR, inaddr_any); setSn_DPORT(UDP_SOCK_NR, UDP_PORT); } socket(UDP_SOCK_NR, Sn_MR_UDP, UDP_PORT, UDP_FLAG); } void udp_task(void) { … switch(getSn_SR(UDP_SOCK_NR)) { case SOCK_UDP : if((size = getSn_RX_RSR(UDP_SOCK_NR)) > 0) // goes here: and size=0 ? { if(size > TX_RX_MAX_BUF_SIZE) size = TX_RX_MAX_BUF_SIZE; if( recvfrom(UDP_SOCK_NR, buf, size, destip, (uint16_t*)&destport) <= 0) break; .... } }

Eugeny · Answer

vanvught: Both sending and receiving UDP broadcast is working fine. So what is the problem then? If zhang: The Problem is how to configure the W5500 to response? Then I guess you must write code which will respond to these broadcast datagrams.

zhang · Answer

image1191×515 80.9 KB The Problem is getSn_RX_RSR(UDP_SOCK_NR) is always Zero. Also tested with free UDP Tools.

Eugeny · Answer

zhang: The Problem is getSn_RX_RSR(UDP_SOCK_NR) is always Zero. Before several posts above you said vanvught: I can confirm that it is working. … Both sending and receiving UDP broadcast is working fine. and now you say that RSR is always 0. So it is NOT working? And please explain what is not working, how it does not work, how you think it must work, and attach wireshark logs of what is going on the W5500 interface to prove that there’re actual packets to be received by the W5500 (not wireshark log from another endpoint, but wireshark log from the last device in the chain just before W5500 - you may need to draw the diagram of your network).

vanvught · Answer

Eugeny: Before several posts above you said Hi Eugeny, please note that there are 2 different users replying here. I was confirming your remark. Zhang has the issue.

Eugeny · Answer

vanvught: there are 2 different users replying here Thank you very much for pointing me, should have seen it before! Thus if you have it working properly, it means that things should work, and Zhang should have some mistake - in chip configuration or in the wire.

zhang · Answer

udp.zip (198,2 KB) this is the Wireshark log file. PC: 192.168.178.21 W5500: 192.168.178.2 Also verified that data can be sent from W5500 to PC with sendto(UDP_SOCK_NR, Buf, 4, destip, destport); (UDP Tools received the message.) But getSn_RX_RSR(UDP_SOCK_NR) is 0 when PC send message to W5500 (even dest-IP 192.168.178.2 or 192.168.178.255) . As already mentioned, TCP works.

zhang · Answer

Just changed the order like this: socket(UDP_SOCK_NR, Sn_MR_UDP, UDP_PORT, 0x00); socket(TCP_SOCK_NR, Sn_MR_TCP, TCP_PORT, 0x00); while(getSn_SR(TCP_SOCK_NR) != SOCK_INIT); It works now (do not know why). Great! Thank you very much.