NetworkDetection: fix bandwidth measurement always returning zero

Liu Jierequested to merge
kylinliujie/krdp:work/bandwidth_measurement into master

Fix bandwidth measurement always returning zero

Problem: Bandwidth measurement never worked due to two bugs:

  1. Read netCharBandwidth which FreeRDP never populates on server side
  2. Per-frame Start/Stop caused client to measure timeDelta=0 (Start and Stop PDUs arrived at client within the same millisecond)

Fix: Use callback timeDelta/byteCount to compute bandwidth, and manage measurement as a 500ms window in update() spanning multiple frames.

Edited by Liu Jie

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