w5500 can not connect to server after running a couple of hours

Question

I used the official reference codes. It works well and even runs correctly for days without any issue in my company. It can work and connect to server correctly in my customer’s company and also runs for a couple of hours correctly. but it can not connect to server after correctly running a couple of hours, when I check the log, I found the socket established well, and after issuing a connect command, the snsr was always syncsent status, when I powered off and on again, the problem reproduced. when the problem occured, if I used the same cable to plug into my computer, the computer can work correctly. Please anyone help. Peter Fu

Eugeny · Answer

[quote=“peter1104, post:1, topic:3190”] 4) but it can not connect to server after correctly running a couple of hours, when I check the log, I found the socket established [opened?] well, and after issuing a connect command, the snsr was always syncsent status,[/quote] This needs further troubleshooting: Use Wireshark or any other network monitoring tool to see contents of SYN packet W5500 sends, and if server replies. As an example, if you have rights for the server, install wireshark there (as the server is the one of the nodes in the communication); when issue happens, perform dump of all common and socket registers to ensure they are set properly. peter1104: when I powered off and on again, the problem reproduced. You mean W5500 is stuck in SYNSENT state, you power cycle W5500, and after it initializes it still can not connect to the server? If yes, then what do you do to make it cinnecting again? peter1104: 5) when the problem occured, if I used the same cable to plug into my computer, the computer can work correctly. So you unplug cable from the W5500 and plug into PC, that PC using this cable and this port of the switch cable is connected to can connect to the server?

Eugeny · Answer

Sounds like there’s an issue with ARP cache, and not only at W5500 side. Let’s make a quick check: in common register area you populate GAR, SUBR, SHAR and SIPR? And your SHAR does not have two lowest bits in first octet set (which make MAC address locally administered and multicast)? you close and reopen socket before you make next (new) connection? you DO use different Sn_PORT source socket port numbers every time you connect (you do NOT reuse port #)?

peter1104 · Answer

@@1. codes below is to get register set from response of dhcp, also, I copied the mac of my wifi module (wihch driving w5500 through spi, the mac is officially assigned, and wifi module won’t connect any wifi route or switch), so it won’t be a locally admined or multicast, by the way, when first plugging in the cable, it works for a couple of hours with the same mac) if ((dhcp_ret == DHCP_IP_LEASED) || (dhcp_ret == DHCP_IP_CHANGED)) { #if USER_DEBUG os_printf("
w5500_dhcp_execute2 b
"); #endif getIPfromDHCP(gWIZNETINFO.ip); getGWfromDHCP(gWIZNETINFO.gw); getSNfromDHCP(gWIZNETINFO.sn); getDNSfromDHCP(gWIZNETINFO.dns); gWIZNETINFO.dhcp = NETINFO_DHCP; ctlnetwork(CN_SET_NETINFO, (void*) &gWIZNETINFO); display_netinfo(); dhcp_lease_time_rest=getDHCPLeasetime(); @@2. yes, I can find the log in order: "%d:sock closed1","%d:sock closed2","%d:try to connect to the %d.%d.%d.%d : %d
". @@3. yes, you can find the any_port++ void ICACHE_FLASH_ATTR w5500_send2() { #if USER_DEBUG os_printf("wa70."); #endif os_timer_disarm(&w5500_timer_sending); if(connected ==0) return; if(data_sending==NULL) return; // max wait times static uint8 connectwaittimes=0; connectwaittimes++; if(connectwaittimes>30) { issending=0; connectwaittimes=0; close(SOCK_TCPS); #if USER_DEBUG os_printf("wa39."); #endif return; } int32_t ret; uint16_t size = 0; uint16_t any_port = 50000; uint8 SnSR=getSn_SR(SOCK_TCPS); #if USER_DEBUG os_printf("wa71:%x.",SnSR); #endif switch(SnSR) { case SOCK_ESTABLISHED : connectwaittimes=0; #if USER_DEBUG os_printf("wa0."); #endif if(getSn_IR(SOCK_TCPS) & Sn_IR_CON) // Socket n interrupt register mask; TCP CON interrupt = connection with peer is successful { #if USER_DEBUG os_printf("%d:Connected to - %d.%d.%d.%d : %d
",SOCK_TCPS, server_ip[0], server_ip[1], server_ip[2], server_ip[3], server_port); #endif setSn_IR(SOCK_TCPS, Sn_IR_CON); // this interrupt should be write the bit cleared to '1' #if USER_DEBUG os_printf("wa1."); #endif } #if USER_DEBUG…