9 replies to this topic

[Mercer]

Is support for multicast planned? If so, can I use the SocketOptionName methods? I am looking forward to checking out the Netduino Go, but I need multicast support. The following is a segment of code I am currently using on the PC that I would like to port to the Netduino.

   NetworkInterface.EnableStaticIP(ip, subnet, gateway, mac);
   NetworkInterface.EnableStaticDns(new byte[] { 192, 168, 1, 1 });
   Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
   
   socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, multicastIPAddress.GetAddressBytes());
   socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 1);
   
   IPAddress DestinationIP = new IPAddress(new byte[] { 239, 255, 0, 1 });
   IPEndPoint DestinationEndPoint = new IPEndPoint(DestinationIP, 5568);

[Chris Walker]

Hi Mercer, Since we have more flash and RAM on Netduino Go, we may be able to support this...as long as NETMF supports it. Chris

[Mercer]

Hi Mercer,

Since we have more flash and RAM on Netduino Go, we may be able to support this...as long as NETMF supports it.

Chris

Hello Chris,

I finally got around to testing this with the N2+. When I call SetOption, I get the following error

A first chance exception of type 'System.Net.Sockets.SocketException' occurred in Microsoft.SPOT.Net.dll
An unhandled exception of type 'System.Net.Sockets.SocketException' occurred in Microsoft.SPOT.Net.dll

   socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, multicastIPAddress.GetAddressBytes());  //Fails
   socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 1);  // Fails
   socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true); // Works

Any idea why this is failing or if this could be addressed in a future release? I believe NETMF supports this, but not sure. Thanks.

[Valkyrie-MT]

Is support for multicast planned?

mIP could be modified to do generic UDP multicast. Right now mIP does multicast for the mDNS implementation. All the code is C# too. The only hiccup is getting a firmware build without the Ethernet compiled in. Chris, what would happen if someone loaded the NetduinoGo firmware on the N2+ ?

See mip.codeplex.com

-Valkyrie-MT

[Mercer]

mIP could be modified to do generic UDP multicast. Right now mIP does multicast for the mDNS implementation. All the code is C# too. The only hiccup is getting a firmware build without the Ethernet compiled in. Chris, what would happen if someone loaded the NetduinoGo firmware on the N2+ ?

See mip.codeplex.com

-Valkyrie-MT

Thanks Valkyrie for the suggestion.

[Mercer]

When I call SetOption, I get the following error A first chance exception of type 'System.Net.Sockets.SocketException' occurred in Microsoft.SPOT.Net.dll An unhandled exception of type 'System.Net.Sockets.SocketException' occurred in Microsoft.SPOT.Net.dll socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, multicastIPAddress.GetAddressBytes()); //Fails socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 1); // Fails socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true); // Works Any chance of getting this fixed/added in future releases?

[Chris Walker]

Hi Mercer, Is this code which works on some other NETMF board? If NETMF supports it and turning on the feature won't overflow the RAM, we could certainly support it. If it's not something which NETMF supports, we can request that it be added (or add it as a community and contribute it to the netmf.codeplex.com core). Chris

[mackelen]

What are you trying to accomplish with the multicast ? Is it just to do a local broadcast of an UDP message ? Or is it something else ?

[flkendall]

I also have an interest in multicast. I'm working to build robot model satellites using software that commands actual satellites. The handshaking between software modules is already multicast. I’m hoping to piggyback off the existing communications protocols. I have C# code that I’ve used on Windows phones that has worked well for me in the past. I’ve tried using Framework 4.1 and 4.2 with same results mentioned here. Please advise!

[Mercer]

Hi Mercer,

Is this code which works on some other NETMF board? If NETMF supports it and turning on the feature won't overflow the RAM, we could certainly support it.

If it's not something which NETMF supports, we can request that it be added (or add it as a community and contribute it to the netmf.codeplex.com core).

Chris

Chris.

I did some testing on another board, and the following code works as expected.

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, multicastIPAddress.GetAddressBytes());
            socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 1);

            IPAddress DestinationIP = new IPAddress(new byte[] { 239, 255, 0, 1 });
            IPEndPoint DestinationEndPoint = new IPEndPoint(DestinationIP, 5568);

So, it looks like this could be supported in future releases and would make a great addition. Thank you for considering.