First, clone this repository and install hostapd.

$ git clone https://github.com/michael-platzer/uas-remote-id.git
# apt install hostapd

Next, make sure that WiFi is not blocked by rfkill (which is the default on a fresh install of Raspi OS). Note that this setting is restored at boot time.

# rfkill unblock wlan

Run the gen_uas_remote_id.py script to start generating test beacon frames.

# ./gen_uas_remote_id.py [-i INTERFACE] [-s SSID] LONG,LAT,ALT

The option -i allows to specify the WiFi interface to use (use iw dev to show all available WiFi interfaces) and -s allows to specify an SSID name to be used in the beacon frames. LONG, LAT, and ALT are the longitude, latitude, and altitude, respectively, of the desired start point in WGS84 (EPSG 4326) coordinates.

Example use:

# ./gen_uas_remote_id.py -i wlan0 -s Test 13.5,47,200.5

In order to verify whether the beacon frames are correctly generated, create a monitor for WiFi frames on a separate machine and use Wireshark to capture frames.

# systemctl stop NetworkManager
# iw dev <wlan-interface> interface add mon0 type monitor
# ip link set mon0 up

Within Wireshark, open the monitor interface mon0 for capturing. In order to filter only beacon frames, use the wlan.fc.type_subtype == 0x0008 filter rule.