W5300 UDP Multicast Join/Report

Question

For some reasion I don’t get the IGMP join/report message by init a socket to udp Multicast. Sometimes the same code on another device work 100% fine. In everycase the transmitting messages will be sent to the ethernet but because the missing join/report not forwarded by every switch. Also I am missing a join/report after disconnecting the lan cable and reconnecting it to another switch for example. my code: setSn_DHAR( s, multicastMac ); setSn_DIPR( s, multicastIp ); setSn_DPORTR( s, multicastPort ); IINCHIP_WRITE(Sn_MR(s),(u16)(Sn_MR_UDP| Sn_MR_MULTI)); IINCHIP_WRITE(Sn_PORTR(s),multicastPort ); // Same Port for both to handle receive and transmit in one socket setSn_CR(s, Sn_CR_OPEN);

Eugeny · Answer

RoF: on another device work 100% fine If it is proven you must check what is the difference. MAC address? RoF: udp Multicast Some time ago I was playing with multicast to find out that it does not work (disabled/not configured) over internet. Would be good if you share network logs.

RoF · Answer

I have two device with the same firmware to use the UDP Multicast group. The one that is working fine does have the IP 192.168.11.58 The not working does have the IP 192.168.11.10 the IGMP message of the …58 image977×700 23.2 KB

RoF · Answer

one of the multicast messages of…58 image931×692 22.3 KB

RoF · Answer

one of the multicast messages of…10 image898×682 22.2 KB the IGMP Message is missing for that device.

RoF · Answer

Because the missing IGMP Join/Report one of my switches (DGS-1008D) does not forward the multicast messages to this device.

RoF · Answer

The only difference are MAC, IP and Data. Thats why I am so irritated to this. I already changed the IGMPv from 1 to 2. But nothing.

Eugeny · Answer

And what is the difference exactly? Did you perform analysis of differences?

RoF · Answer

What you mean exactly with analysis Update: I have a third hardware that is making my irritation perfect. This device sends the IGMP message only every second boot. It seams to be not a software bug. Any Idea But i never get a join/report after disconnecting the lan cable and reconnecting it to another switch. Is that normal? Does i have to reinit the socket for that functionality?

Eugeny · Answer

RoF: This device sends the IGMP message only every second boot. The sending process is only dependent on the chip. If it does not really send the message then there’s something wrong in the driving code. However “not received by another host” and “not sent from here” are different matters. You must watch for messages being sent on the device directly connected to the W5300 (e.g. in bridge mode) ensuring it does not perform any filtering. If there’s a switch or anything else in between contents of the packets may be altered, or packets can simply be discarded.

RoF · Answer

I am directy connected to the W5300 device with a seperate ethernet card of my PC, to look for the IGMP messages. And to look to more then one device at the same time I use a HUB (Netgear DS106) and no switch between the devices and my PC. To trace the ethernet data I use Wireshark with an empty filter.

RoF · Answer

Is it maybe possible that my Init of one socket to the multicast is that quiek after power up the device, that the w5300 interface is already active but the connection to the physical ethernet is still not working? The W5300 is thinking he sends the IGMP message but it will not be received from the PC/Hub/Switch on the other side of cable?

Eugeny · Answer

RoF: I am directy connected to the W5300 device with a seperate ethernet card of my PC, to look for the IGMP messages. Not sure I understand the topology. W5300 is having only one ethernet port, and if it is connected to your PC then your PC must forward packets to outer world. RoF: I use a HUB (Netgear DS106) Only direct connect will give you guarantee.

RoF · Answer

I tried both. With Hub and directly. [W5300]---------[PC with Wireshark] [W5300]-----[HUB]-----[PC with Wireshark]

RoF · Answer

It seems to be a bootup problem. In case of closing and connecting again to the multicast group while running, everything is working fine. I have to look to my Init and to do the connecting a bit later. (hopefully) Still open issue: But i never get a join/report after disconnecting the lan cable and reconnecting it to another switch. Is that normal? Does i have to reinit the socket for that functionality? Any ideas?

RoF · Answer

If I do the opening again, a IGMP report will be send. That i can do periodically and that works. But this solution is not that smart. How can I get the Link-Status? I don’t find any register for that information . Many thanks for your help.

Eugeny · Answer

Register 0x2E “PHYCFGR”, bit 0. Wrong statement, see below…

RoF · Answer

The documentation is telling me in chapter 5.2.2.2 Multicast (Page 108) After opening SOCKET, “Report” message is automatically & periodically transmitted. Is that an error? Or do I have to activate this?

RoF · Answer

Eugeny: Register 0x2E “PHYCFGR”, bit 0. Really? Because the documentation tells me something different.

Eugeny · Answer

OMG, I am mistaken. I was looking into the W5500 documentation! It seems W5300 does not have such register, I recall there was advice to have MCU sensing link LED output pin in this case.