Added debug-only code to measure Http-based upload test timings.
Merge branch 'master' into test_timings
Much improved behaviour observed, when specifically setting the send buffer size to a relatively small value.
Tidied-up the 32k upload buffer forcing code.
Work-around issue seen on 1 device, when pressing back button.
Commented-out the timing code, removed all compiler warnings.
Commented-out debug logs, removed compiler warnings.