Playback Data Source allows you to play back the log files recorded using the Data Recording processing module. Playback never sends any data to any physical device; it only “mimics” the original device and allows the user to replicate the original monitored session. Log file playback is useful if session analysis is hard or impossible in real-time during actual device monitoring.
Device Monitoring Studio has two globally configured paths: path to log files and default path for playback. By default, these paths both point to the same folder and this is a recommended configuration. The user may change these paths on the Tools » Settings, Recording/Playback Tab.
Data Recording uses the log folder to store log files it creates. Playback Data Source scans the playback folder for log files and adds them to corresponding categories in Devices Tool Window. A Recorded Sessions category is created as a child of USB, Serial or Network categories, into which log files are added. For convenience, device log files are placed into the category named after the device.
Device Monitoring Studio automatically watches for changes in the playback folder and updates the tree accordingly.
A single log file may contain multiple streams. All streams are displayed in a tree and may be monitored separately.
To start log file playback, select a log file stream in a tree and press the Start Monitoring… button or just double-click it. A Session Configuration Window opens. The remaining configuration process is the same, as for any other monitoring session. In addition to selecting data processing modules and capture filter, you may configure the playback source itself. Click the Configuration link to open the following window:
Here you can specify which portion of the log stream data you want to play back and at which speed. You may select speeds from 1:16 to 16:1, as well as two additional options: stepped and continuous. These addition options mean the following:
During playback, Device Monitoring Studio's status bar displays two progress bars and optional Next button. The first, longer progress bar displays the overall playback progress. If there is a significant delay between two consecutive packets, a second progress bar visualizes this delay. If you do not want to wait, click the Next button. In stepped playback speed mode, you must press the Next button after each packet.
You may use additional commands, available through the item context menu in Devices Tool Window to manage log files:
Although Device Monitoring Studio automatically detects and displays log files in default playback folder, you may easily play back a log file located in any other location. Just use the File » Open command, Drag&Drop or simply double-click the log file in Windows Explorer to open the file in Device Monitoring Studio and bring up the Session Configuration Window.