Software for wifi appliances built from the cheapest ali-express gray-market goods and the least amount of software.
"Converse":
- raspberry pi 3
- usb powerbank
- 4 port usb hub
- 3x usb wifi adapters
- u-blox 7; gps
- GEMBIRD card-reader
- xGB sd card for data (nilfs2 suggested)
- 2GB microsd for OS image
Power draw: 5.8W (~1.3A). Potential for brownout if hub uses power over rpi.
Tested wifi:
- ar9271; 802.11n (best)
- rt3572; 802.11ac (ok)
- rt5370; (ok)
- mt7601u; 802.11n (ok; hangs if too many adapters)
- rt3070; 802.11n (poor)
This should build wherever if you have docker on an otherwise reasonable linux system:
- make
- rsync
- docker
OWA_DEV=/dev/sdx make install-imageThe system needs a flash card in addition to the system card. All scan data is written to the data card.
Each boot initializes a new data directory on the data card, /owa/<boot-time>, with the following directories:
- / -- tcpdump logs for device, iwconfig data, lsusb data
- gps/ -- gps logs, lsusb data
- log/ -- system logs