On Dec 3, 2012 10:04 AM, "Andreas Wehrmann" <a.wehrmann@centersystems.com> wrote:

On 12/03/2012 03:51 PM, Joseph Sulewski wrote:

Thanks guys I'll give this a try.  Two questions.

When I call socket->bind I provide it with an endpoint.  When I create
the endpoint I'm currently using the multicast address, what should I
use for the address?  If I'm binding to multiple multicast addresses it
doesn't make sense to bind to one of them.

Finally,  it appears I can join multiple multicast groups but they need
to be the same port.  Is this correct?

Thanks again

In socket->bind() you specify the address of the local network device
you want to listen on for incoming packets, not the multicast address you want to join.

You can also specify "any" address (that is: "all" interfaces) like so:

socket->bind( boost::asio::ip::udp::endpoint( boost::asio::ip::udp::v4(), port_number ) );

Or use v6(), if you want an IPv6 socket.

Regarding the port number: you can bind to only one port per socket.

--
Mit freundlichen Grüßen / Best regards

Andreas Wehrmann


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