BLE Sniffer

This example shows BLE sniffing with Nordic's BLE sniffer firmware. Instructions for setting up a sniffer can be found here. This example assumes that you have the proper firmware flashed to the sniffing device, this device is connected to the gateway via USB, and you know the port name of the sniffer.

This project consists of two files:

conftest.py - Implements a fixture that creates a new PCAP for each test, containing the sniffed BLE packets.

test_sniffer.py - Contains a simple do-nothing test; in the real world this would trigger some BLE functionality that is sniffed.

conftest.pytest_sniffer.py

import os
import pytest
import time
import subprocess
import asyncio
import logging
import pytest_asyncio

# Import EmbedOps provided sdk features
from hil_sdk.interfaces.ble.sniffer.ble_sniffer_interface import BLESnifferInterface

BLE_ADDR_STR_LEN = 18  # Length of a BLE address string (including newline)

# Global config options
BLE_SNIFFER_COM_PORT = <sniffer port name>
BLE_SNIFFER_ADDRESS  = "F2:53:0C:C0:B7:5D"  # Address of device to follow with sniffer

# Uncomment this fixture to add function-level sniffing for each test
# Due to the way the sniffer works, the address must be provided manually
# The autouse=True automatically starts the sniffer for each test
@pytest.fixture(scope="function", autouse=True)
def ble_sniffer_fixture(request, hil_results_get_path):

    ble_sniffer = BLESnifferInterface(BLE_SNIFFER_COM_PORT)

    address = BLE_SNIFFER_ADDRESS
    outfile = os.path.join(hil_results_get_path("%s.pcap" % request.node.name))
    logging.info(f"Starting sniff of device address {address} to {outfile}")
    assert ble_sniffer.start_sniffing(outfile, device_address=address) == True

    yield

    assert ble_sniffer.stop_sniffing() == True

import time

def test_blank():

    # Start some BLE traffic here
    time.sleep(5)

    assert True