v1.2.0

Added

• Continuous speedtest during recording — measure download and upload throughput at regular intervals while recording cell data, so you can see how signal strength relates to actual network performance. Uses a custom implementation of the Speedtest.net HTTP protocol (no third-party app required).
• Speedtest settings — enable or disable speedtests, toggle upload testing, set the interval between tests, and optionally pin a specific speedtest server in Settings.
• Speedtest EULA dialog — first-time speedtest users see a brief notice about the Speedtest.net terms before enabling the feature.
• Live speedtest status — the recording screen shows the current speedtest phase (selecting server, downloading, uploading) and latest results in Mbps.
• Speedtest markers on replay — speedtest results appear as dots on the session replay timeline; tap one to see its details, or the summary card auto-shows the result at your current replay position.
• Speedtest analytics — session detail now includes a speedtest section with average/peak download and upload speeds, throughput histograms, and correlation charts showing how speed varies with signal strength, network type, and SIM.
• Speedtest CSV export — export speedtest results as a separate CSV file alongside cell data.
• Global speedtest stats — the Statistics screen now shows overall speedtest averages across all sessions.
• Indoor recording mode — record cell coverage inside buildings, basements, and anywhere GPS can't reach. Choose "Indoor" when creating a session; your phone tracks your walking path using motion sensors instead of satellite signals.
• Accelerometer step detection fallback — if your phone's built-in step counter isn't available (some devices don't have one, or it may not detect steps when the phone is in your hand), the app detects steps from the accelerometer automatically.
• 2D path canvas — indoor sessions show your walking path on a pannable, zoomable canvas instead of a map. The path is color-coded by signal strength, packet loss, cell ID, network type, or band.
• Tracking confidence indicator — shows how reliable your indoor position estimate is: Confident, Degrading, or High drift, based on how long since your last origin reset and how far you've walked.
• Drift radius — a translucent circle around your position grows over time to show how much uncertainty has accumulated.
• Reset Origin button — tap to recenter your position mid-recording. The old path is preserved with a gap marker so you can see where you reset.
• Sensor health warning — if no steps are detected for 10 seconds, a banner suggests moving the phone to your pocket for better tracking.
• Indoor recording settings — adjust your step length (0.3–1.2 m) and recording interval in Settings.
• Ping stats in indoor mode — live ping latency and packet loss are now visible while recording indoors.
• Indoor session detail and replay — review your indoor path with full replay support, signal coloring, and the same display modes as the outdoor map.
• Indoor export and import — indoor sessions export relative coordinates in CSV and GeoJSON; GeoJSON files include an indoorMode flag so tools can distinguish them from GPS-tracked data.

Changed

• The recording screen now shows the path canvas for indoor sessions and the map for outdoor sessions.
• Heading direction is now calculated using the standard Android sensor API, which is more reliable on devices with 3-element rotation vectors.
• Database schema updated to v11 to store speedtest records, indoor session mode, relative coordinates, and indoor settings.

Fixed

• Speedtest always failed on Android because the config fetch sent a gzip header that Android's HTTP stack doesn't expect, and latency pings used the wrong URL scheme.
• Speedtest always returned 0 Mbps because Android 11+ blocks unencrypted HTTP by default — the app now uses the correct network security configuration and upgrades to HTTPS when the server supports it.
• Speedtest server was re-discovered on every test after any error, even unrelated ones. Cache now persists across measurement failures.
• Speedtest upload analytics showed download speeds instead of upload speeds — now correctly computed.
• Mbps displayed as 0 for sub-1 Mbps speeds (e.g., 0.4 Mbps showed as 0) — now shows one decimal place.
• Replay speedtest summary always showed the latest test instead of the one at your current playback position — now auto-updates as you scrub through the timeline.
• Indoor recording produced no path or data on Android 10+ because the physical activity permission was missing. The app now requests it automatically before starting an indoor session.
• Wrong heading direction on some devices due to an incorrect fallback in the compass calculation, which could cause the indoor path to point the wrong way.
• Indoor recording could silently fail if the step sensor couldn't be started — no error was shown, and no data was collected. The app now falls back to the accelerometer automatically or shows an error if no sensors are available.

v1.1.1

Added

• Ping engine now uses the -O (outstanding) flag for immediate packet loss detection — dropped ICMP packets are identified as soon as they happen, not when the next successful reply arrives
• Ping results now carry an outcome classification (success, timeout, host unreachable, process error) for richer diagnostics
• Host unreachable and network unreachable errors are now properly detected and classified

Changed

• Packet loss calculation now uses the ping outcome instead of null latency — more accurate and self-documenting
• Live cell info screen's ping loop migrated from per-ping processes (ping() deprecation path) to the same continuous flow used during recording sessions

Fixed

• Fixed packet loss being underreported — dropped packets were previously invisible because ping -i doesn't output timeout lines without the -O flag
• Fixed process-death events being incorrectly counted as individual dropped packets — they now carry a separate "process error" outcome

v1.1.0

Added

• Carrier Aggregation support: secondary LTE bands are now recorded alongside the primary band
• Live Info screen now shows secondary (CA) bands in real time per SIM
• Band Distribution charts now include secondary CA bands
• CSV and GeoJSON exports now include secondary CA bands
• Re-imported sessions correctly restore CA band data
• When GPS signal is lost during recording, the app now estimates your speed using the accelerometer to keep your position on track until GPS returns
• 5G NSA (Non-Standalone) recording support: when on a 5G NSA network, the app now correctly records the NR cell (band, PCI, signal) and saves the underlying LTE anchor cell's details alongside it
• Replay and session detail screens now show the LTE anchor's band, PCI, and signal strength for 5G NSA records
• Live Info screen now shows the LTE anchor cell info when connected via 5G NSA
• 5G NSA recordings now include carrier aggregation bands from the LTE anchor

Fixed

• Fixed direction tracking during GPS loss — movement now follows the correct heading
• Fixed 5G NSA recordings being incorrectly labeled as "4G" — now correctly recorded as "5G_NSA"
• Fixed NR cell data (PCI, RSRP, RSRQ, SINR, band) being lost during 5G NSA sessions
• Analytics "Massive MIMO Candidate" insight now includes 5G NSA handoff events alongside 5G SA

Changed

• CSV and GeoJSON export now include anchor cell columns for 5G NSA records (prefixed with anchor_)
• Room database schema updated to v8 (automatic migration, no data loss)

v1.0.3

Added

• Anomaly inspector bottom sheet with filter chips and lazy virtualization
• Group repeated anomaly messages into duration-aware anomalies (peak latency, episode duration)

Fixed

• FAB position offset from corner
• Extra left padding in landscape mode
• Double bottom padding on all screens

v1.0.2

Fixed invalid looper error when launching a recording session.

v1.0.1

Bugfix for incorrect git hash in settings UI.

v1.0.0 Initial Release

First release of the app codebase.

Full Changelog: https://github.com/licson/cell-recorder/commits/v1.0.0