https://github.com/bk138/multicast-client-server-example

This is a simple educational example of an IPv4/IPv6 multicast client and server, running under UNIX and Win32.
https://github.com/bk138/multicast-client-server-example

cross-platform example linux macos multicast windows windows-ce

Last synced: about 2 months ago
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This is a simple educational example of an IPv4/IPv6 multicast client and server, running under UNIX and Win32.

• Host: GitHub
• URL: https://github.com/bk138/multicast-client-server-example
• Owner: bk138
• License: gpl-2.0
• Created: 2010-01-09T17:24:38.000Z (over 15 years ago)
• Default Branch: master
• Last Pushed: 2023-04-30T06:44:01.000Z (over 2 years ago)
• Last Synced: 2025-04-10T00:13:42.323Z (6 months ago)
• Topics: cross-platform, example, linux, macos, multicast, windows, windows-ce
• Language: C
• Homepage:
• Size: 56.6 KB
• Stars: 59
• Watchers: 7
• Forks: 25
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: COPYING
  • Authors: AUTHORS

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This is a simple educational example of a multicast 

client and server, running under UNIX and Win32.

# Building

To compile, use

    mkdir build

    cd build

    cmake ..

    cmake --build .

## Crosscompiling from Unix to Android

See https://developer.android.com/ndk/guides/cmake.html as a reference, but

basically it boils down to adding `-DANDROID_NDK= -DCMAKE_TOOLCHAIN_FILE= -DANDROID_NATIVE_API_LEVEL=`

to the `cmake ..` step above.

# Troubleshooting

If there is no data coming through when client and server are on different

machines, the reason can be that IP routing is configured in a way that routes

multicast traffic to or expects multicast traffic from an interface the other

machine is not connected to (the sample programs in this repo do not use the

`IP_MULTICAST_IF` setsockopt() call yet as it's not cross-platform).

In this case, you have to add a static route to the client and/or server machine's

routing table indicating the interface for multicast traffic. The internet has

lots of examples.