mckero
2ff8643988
The position line was one string template, and it broke four rules at once. No path. The specification says a client-originated packet carries TCPIP* in the path, "nothing more or less", and there was none - `CALL>APRS:=...` went out bare. No position meant 0,0. When the station QTH was unset and no GPS fix was available, `lat ?: 0.0` put the operator at 0 degrees north, 0 degrees east - a point in the Gulf of Guinea - on the global network, under their own callsign. There is no honest default for "nowhere", so AprsBeacon refuses instead and the reporter says why. A genuine 0,0 fix is still legal and still sent; the refusal is about absence. No comment sanitising. A line break typed into the status field ended the packet and started a second one from the remaining text, which an operator could trigger by pressing return. Measured: the old builder emitted two lines from one call, the second impersonating whatever callsign the text contained. Only printable ASCII survives now. No length cap. A 600-character status produced a 636-byte line against a 512-byte limit including CRLF. The comment is trimmed to whatever room is left after the header and the coordinates, bounded also by the format's own 43-character limit. Symbol handling was whatever character the operator typed first, including one that breaks the fixed-width parse. It now accepts only what the specification allows - the two table selectors and overlay characters - and falls back to the primary table. aprs.fi names symbol misconfiguration as the most common reason a station never appears on the map, so this is not cosmetic. Separately, beaconing stopped whenever the screen locked. The interval was a coroutine delay inside the reporter, and Doze suspends network access and ignores wake locks even for a foreground service: the timer fired on schedule and then could not reach the network, while the notification went on claiming the service was running. The service now books each beacon with setExactAndAllowWhileIdle, which is the only scheduling that survives Doze, and reschedules after each tick so a changed interval applies at once. If the operator has revoked exact alarms it falls back to an inexact one, which beacons late rather than not at all. The foreground service type changes from dataSync to location. dataSync is capped at six hours in any 24-hour window on recent Android and then stopped by the system, which would silently end a beacon meant to run all day; the service reads the station position and falls back to GPS, so location describes what it actually does. The interval floor becomes five minutes rather than one. This station is fixed or walking, and APRS-IS etiquette is to beacon no more often than the position changes. The packet builder moves to core:domain as pure logic, so all of this is testable without a socket - including that a comma-decimal locale cannot corrupt the coordinates, which nothing covered before.
Look4Sat: Satellite tracker
Radio satellite tracker and pass predictor for Android, inspired by Gpredict
Track satellite passes with ease!
Thanks to Celestrak and SatNOGS you have access to over 9000 active satellites.
You can search the entire database by NORAD Catalog Number or the satellite's name.
Orbital positions and passes are calculated relative to your location.
To get reliable data make sure to set the station position via the app Settings.
The application is built using Kotlin, Coroutines, Jetpack Compose and Navigation.
It is now and always will be completely ad-free and open-source.
Main features:
- Predicting satellite positions and passes for up to 10 days
- Showing the list of currently active and upcoming satellite passes
- Showing the active pass progress, polar trajectory and transceivers info
- Showing the satellite positional data, footprint and ground track on the map
- Custom TLE satellite data import is available via Three Line Element .txt files
- Offline first: calculations are made offline. Weekly TLE data update is recommended.
License
The Look4Sat application code is licensed under the GNU General Public License v3.0.
The CW decoder in feature/cw bundles the DeepCW
neural decoding model, licensed under the GNU Affero General Public License v3.0 only
(AGPL-3.0-only). Because the combined work incorporates an AGPL-3.0 component, the
combined work is distributed under the
GNU Affero General Public License v3.0 — GPL-3.0 Section 13 permits the
combination, and AGPL-3.0 Section 13 applies to the combined work as a whole.
Model provenance and attribution are documented in
feature/cw/licenses/NOTICE.md; the original GPL-3.0
text is preserved at feature/cw/licenses/Look4Sat-GPL-3.0.txt. The CW model runs
locally on-device and does not provide services over a network.