BLE HCI Demo (nRF54L15)

The BLE HCI demo is a showcase firmware for the nRF54L15 DK that demonstrates LogScope’s features through physical button interactions and real Bluetooth LE connections.

Quick Start

# Flash prebuilt hex
nrfutil device program --firmware samples/nrf54l15-ble-hci-demo/build/merged.hex --serial-number <SN>
nrfutil device reset --serial-number <SN>

Or build from source:

source samples/nrf54l15-ble-hci-demo/setup-env.sh
west build -b nrf54l15dk/nrf54l15/cpuapp samples/nrf54l15-ble-hci-demo --build-dir build-hci -p
west flash --build-dir build-hci

Then open LogScope, connect via J-Link RTT with the Zephyr parser.

Buttons

Button	Idle State	Connected State
Button 0	Toggle advertising on/off	Force disconnect
Button 1	Sensor anomaly sequence (4 messages)	Anomaly + 10 notification burst
Button 2	Flash corruption sequence (5 messages)	Same
Button 3	Stress burst (50 rapid-fire messages)	Same

Button 0: BLE State Control

When advertising: Stops advertising.

ble_mgr: Advertising stopped by user

When stopped: Restarts advertising.

ble_mgr: Advertising restarted by user

When connected: Forces a disconnect.

ble_mgr: User-initiated disconnect
app: Disconnected: XX:XX:XX:XX:XX:XX (reason 0x16 Remote User Terminated Connection)
app: Re-advertising started

Button 1: Sensor Anomaly

Simulates a temperature spike:

sensor_drv: Anomaly detected: temperature spike to 85.2C (threshold: 60.0C)
sensor_drv: Thermal threshold exceeded, initiating cooldown
sensor_drv: Sensor read timeout during thermal event (retry 1/3)
sensor_drv: Temperature returning to normal: 24.8C

When a BLE device is connected, also sends 10 rapid BLE notifications.

Button 2: Flash Corruption

Simulates storage corruption with recovery:

flash_mgr: CRC mismatch at sector 0x00080000 (expected: 0xA3F1, got: 0x0000)
flash_mgr: Wear level critical on sector 0x00080000 (writes: 99847)
flash_mgr: Flash write failed at 0x00080000 (ECC error)
flash_mgr: Sector 0x00080000 marked bad, remapping to 0x000A0000
flash_mgr: Flash recovery complete, 1 sector remapped

Button 3: Stress Burst

Fires 50 rapid messages (20ms apart) with realistic content cycling through errors, warnings, and info messages. Great for testing LogScope’s parsing performance and watching sidebar counters climb in real-time.

Recurring Events

Interval	Module	Level	Message
Every 2s	sensor_drv	DBG	Temperature, humidity, accelerometer readings
Every 4s	crypto_mgr	DBG	AES-128-CCM encryption operations
Every 5s	app	INF	Heartbeat with uptime
Every 5s	flash_mgr	DBG	Flash write operations
~8-12s	app	WRN	Retransmission warnings (pseudo-random interval)
Every 15s	flash_mgr	WRN	Flash wear level warnings
Every 15s	crypto_mgr	WRN	Key rotation warnings
Every 30s	flash_mgr	ERR	Flash write failures
Every 30s	crypto_mgr	ERR	MAC verification failures
Every 45s	app	WRN/INF	Battery level checks

Bluetooth LE Connection

The firmware advertises as “LogScope Demo”. Connect with the nRF Connect mobile app to see:

Real HCI packets (Connection Complete, Parameter Updates, GATT operations)
Application-level connection/disconnection logs
Sensor data notifications (every 2s when subscribed)

GATT Service

Characteristic	UUID Suffix	Type	Description
Info	`...def1`	Read	Returns device info string
Command	`...def2`	Write	`0x01`=burst, `0x02`=reset sensor, `0x03`=flash erase, `0x04`=fault sim, `0x05`=real fault
Sensor Data	`...def3`	Notify	4-byte sensor value, every 2s when subscribed

Suggested Watch Patterns

Set these up in LogScope to see watch patterns in action:

"logscope.watchPatterns": [
  { "name": "BLE State", "pattern": "Connected|Disconnected|Advertising", "regex": true, "color": "#4caf50" },
  { "name": "Errors", "pattern": "failed|error|fault|CRC|timeout", "regex": true, "color": "#f44336" },
  { "name": "Retransmission", "pattern": "Retransmission", "color": "#ff9800" }
]

Or add them one at a time using the Add Watch Pattern button in the sidebar.

Requirements

nRF54L15 DK (PCA10156)
nRF Connect SDK v3.2.0
Optional: phone with nRF Connect app