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more), and eventually resume_writing() is called once when the
buffer size reaches the low-water mark.

Note that if the buffer size equals the high-water mark,
pause_writing() is not called -- it must go strictly over.
Conversely, resume_writing() is called when the buffer size is
equal or lower than the low-water mark.  These end conditions
are important to ensure that things go as expected when either
mark is zero.

NOTE: This is the only Protocol callback that is not called
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When the connection is made successfully, connection_made() is
called with a suitable transport object.  Then data_received()
will be called 0 or more times with data (bytes) received from the
transport; finally, connection_lost() will be called exactly once
with either an exception object or None as an argument.

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provided by the protocol to avoid unnecessary data copies.  This
can result in noticeable performance improvement for protocols that
receive big amounts of data.  Sophisticated protocols can allocate
the buffer only once at creation time.

State machine of calls:

  start -> CM [-> GB [-> BU?]]* [-> ER?] -> CL -> end

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