[Twisted-Python] Sending a "good-bye message" before closing a connection

[Albert Brandl]

Hi!

We have a small heartbeat-system based on Twisted. The clients register
at the server and send some health information in regular intervals.
If the server does not get a lifesign from a client, this is registered
in a database. 

But sometimes, the clients have to go offline. In this case, I'd like 
them to send a message to the server that they will be gone for a while.
When a client goes offline, the twistd daemon for handling the heartbeats
is shut down.

What is the best way to do this in Twisted? The `clientConnectionLost`
method of the factory is only called after disconnecting, AFAICT.

Thanks & best regards,

-- 
Albert Brandl


​
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