purpose of the example: unicast or broadcast ?

[wfjm]

Nice example, but when it comes to broadcast, it leaves many questions:

• the original gist used broadcast and had a matching title. This example uses unicast. Is that by intention ?
• if unicast is intended here:
  • the forwarding remark in the gist is misleading.
  • why is socket.SO_BROADCAST still enabled at all ? Examples should be concise.
• if broadcast were the (lost) purpose:
  • why is socket.SO_BROADCAST on both sender and receiver side ?
  • a remark might be added on firewalls. If a firewall is active, the port must be opened. Common trap.