WASM Application

The WASM Application can be found in nmea_attack.

lib.rs

Contains functions called by the firmware.

main()

• Reads a message from the message buffer, reads the attack mode from the attack mode buffer.

• Based on the mode, either sends no messages, sends all messages without modifying them, or modifies messages for GPS attacks. When sending messages, messages received on controller 0 are sent to controllers 1 and 2, messages received on controller 1 are sent to controllers 0 and 2, and messages received on controller 2 are sent to controllers 0 and 1.

Attack Modes

Attack modes are currently set from the nmea_t_modes.py script running on the Pi. The script sets controls 2 pins connected to 2 pins on the ESP32.

1. OFF

Stops transmission off all messages passing through the T connector.

2. PASSIVE

This is the default mode. Sends all messages through without modifying them.

3. OPPOSITE DIRECTION ATTACK

Shows the boat moving in the opposite direction of real movement. Flips heading by 180 degrees.

4. TRANSLATION ATTACK

Translates the current position by a constant latitude and longitude. Heading remains the same.