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Mark-

Multicast configuration...

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Posted (edited)

Hello,

 

Never used multicast before and not having success.
I must send a request to a device at 192.168.1.51 port 1500 using UDP.
The device will begin multicasting data on address 224.0.0.0 port 1500.
I send the request and I see the device sending the data on Wireshark. I just do not get any OnDataAvaliable calls.

I set the TWSocket as:

multiSocket.Proto:='udp';
multiSocket.Addr:='192.168.8.169';		//nic to bind to
multiSocket.Port:=portNum;				//1500
multiSocket.MultiCast:=true;
multiSocket.MultiCastAddrStr:='224.0.0.0'; //this is the dst address I see in wireshark, 
										   //tried the sender ip address and got error IP_ADD_MEMBERSHIP ;
multiSocket.ReuseAddr:=true;
multiSocket.Listen;

No error, no data.

I can configure the multicast address on the device. Should the address be changed?
What am I doing wrong?

 

Thanks,

 

Mark

 

Edited by Mark-

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Resolved.

W10 Firewall was allowing outgoing but not incoming.

 

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