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A Python Multicast Client

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Blackboard(addr=MCAST_GRP, port=MCAST_PORT, read_size=READ_SIZE, TTL=MULTICAST_TTL)

  • addr: This is the network address to connect to. It must be an unreserved, available network block that supports the Multicasting protocol. It will default to
  • port: This is the port on the network address the Blackboard will connect to. It will default to 5007.
  • read_size: This will specify the standard read size when getting data from the network address. It will default to 256 bytes.
  • TTL: This is the number of times the signal will propagate through the network before being cut off. It will default to 32.


  • write_json(channel, data): This will write the specified data to the specified channel. The channel can be any arbitrary string.
  • get(channel): This will return the most recent piece of data received on a specified channel.
  • register_callback(channel, f): This will add a callback function that will be called when a specific channel gets data. The callback must be a function that gets a single argument of the data from the channel.
  • is_open(): This function will return True if the Blackboard is connected to the network, and False otherwise.

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