Documentation
Sensors
The object detection script runs on a Jetson Nano located at IT. Jetson Nano is a small and powerful computer for embedded applications that allows to run multiple neural networks. Due to its capacities, this device supports our object detection module.
During the detection in the video stream the number of detected objects is sent to a local broker in 6 different topics, which then sends these values to the central broker in IT.
broker_address = "####.nap.av.it.pt"
port = 1883
#current
currentppl_topic = "detection/people/current"
currentvehicles_topic = "detection/vehicle/current"
currenttwowheelers_topic = "detection/twowheelers/current"
#unique
uniqueppl_topic = "detection/people/unique"
uniquevehicles_topic = "detection/vehicle/unique"
uniquetwowheelers_topic = "detection/twowheelers/unique"
The sniffing script runs on two different APUs. One is located in a smart lamp post near the IT building and another is located in a smart lamp post in Cais da Fonte Nova.
During the detection of MAC address the number of devices is sent to a local broker in 2 different topics, which then sends these values to the central broker in IT.
broker_address = "####.nap.av.it.pt"
port = 1883
currentppl_topic = "sniffing/current"
uniqueppl_topic = "sniffing/unique"
The detection running on the devices are started after the Linux kernel is booted using services units and systemd to manage them. The units are located in the folder /etc/systemd/system.
[Unit]
Description=Wifi Sniffing Service
After=multi-user.target
[Service]
WorkingDirectory=/root/WiFi_Sniffing
User=root
Type=idle
ExecStart=/root/WiFi_Sniffing/venv/bin/python3 /root/WiFi_Sniffing/pyshark_ps.py wlan1
Restart=always
[Install]
WantedBy=multi-user.target
[Unit]
Description=People Detection Service
[Service]
User=root
Type=forking
#WorkingDirectory=/usr/local/bin
ExecStart=/bin/bash /usr/local/bin/runDetection.sh
Restart=always
[Install]
WantedBy=multi-user.target