Multithreaded Server - Razyapoo/Indoor-Positioning-System GitHub Wiki

Overview

The Server simulates a real CCTV camera system, allowing to collect video and UWB data. It is possible to Pause / Continue / Stop recording of data streams

Responsibilities:

• Video recording: handles video recording
• (Centralized) Server for UWB: communicates with UWB tags and collects distance measurements from them
• Activity watchdog: monitors tag responses and detects if the communication between an anchor and tag is blocked

Each work (responsibility) is performed simultaneously in a dedicated thread for better optimization

[!Warning] The video and UWB data streams are not yet synchronized; synchronization is performed later in Indoor Positioning System (GUI)

Output:

• video.avi: Video recording
• video_timestamps.txt: Index file containing frames' timestamps
• UWB_timestamps.txt: UWB measurements together with their timestamps

Installation

Installation process is detailed in the folder containing this application on GitHub.

Usage

Server initialization

# Assuming that we are in the build folder
./Server 

• This will automatically start the UWB server, the watchdog to track activity of tags, and the video recording.

Pause / continue / stop recording

The management of the recording can be performed by using keyboard keys as follows:

• p: pause recording
• c: continue recording
• s: stop and save recording

[!Warning] These keys are pinned to video steam window (cv::imshow). Therefore, the keys should only be pressed when video recording window is active.

[!Warning] After pressing "s", you need to wait until the video is saved correctly. As soon as the video is successfully saved, the program will notify about it.

Activity watchdog

Allows to monitor activity of the tag by detecting whether the communication between an anchor and a tag has been blocked

Example of blocked connection (the window is red):

Example of the normal (non-blocked) connection (the window is green):