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add ability to limit the size of the send queue buffer. #561

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@r0ro r0ro commented Mar 19, 2018

By default _outputBuffer size is not limited and can grow over to the point that iOS decides to kill the app.
By setting maxTxQueueSize it's now possible to ensure that the _outputBuffer size will not consume too much memory.
This is done by blocking the send: methods until _outputBuffer size decreases (once data has actually been sent over the websocket connection).

We were experiencing app termination while trying to upload user videos to our server using websocket, because of this.

I think this is what cased some people to complain in #121
I've added a sample app to test this in my fork: r0ro@728a154

By default _outputBuffer size is not limited and can grow over to the
point that iOS decides to kill the app.
By setting maxTxQueueSize it's now possible to ensure that the _outputBuffer
size will not consume too much memory.
This is done by blocking the send: methods until _outputBuffer size decreases
(once data has actually been sent over the websocket connedtion).
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