neptrack_core

Pure Dart SDK for the NepTrack GPS tracking platform — REST API + real-time Data Stream.

No Flutter dependencies — works in Flutter apps, Dart server processes, and CLI tools.

Manage tokens on the NepTrack dashboard → API Integration → API Tokens.

Install

dependencies:
  neptrack_core: ^0.2.1

Authentication

Generate an API token from the dashboard under API Integration → API Tokens. Each token has scopes; calls that require a scope your token doesn't have will throw NeptrackScopeException.

Quick start

import 'package:neptrack_core/neptrack_core.dart';

final client = NeptrackClient(token: 'npt_...');

final list = await client.listVehicles();
for (final v in list.vehicles) {
  print('${v.regNo}  ${v.status.name}  ${v.speed} km/h');
}

client.close();

REST endpoints

Method	Endpoint	Required scope
`listVehicles()`	`GET /vehicles`	`vehicles`
`vehicleDetail(id)`	`GET /vehicles/{id}`	`vehicle_details`
`vehicleHistory(id, …)`	`GET /vehicles/{id}/history`	`history`
`vehicleReport(id, …)`	`GET /vehicles/{id}/report`	`reports`
`listAlarms(…)`	`GET /alarms`	`alarms`
`listMotionLogs(…)`	`GET /motion-logs`	`motion_logs`
`listGeofences(…)`	`GET /geofences`	`geofence`
`sendCommand(id, action)`	`POST /vehicles/{id}/command`	`command`

Real-time Data Stream

NeptrackStreamClient is a Socket.IO v2 client for live position, alarm, and motion events. Token must include the live_stream scope.

import 'package:neptrack_core/neptrack_core.dart';

final stream = NeptrackStreamClient(
  url:   'wss://...',  // ask NepTrack support for your stream endpoint
  token: 'npt_...',
);

stream.positions.listen((p) {
  print('${p.imei}  ${p.latitude},${p.longitude}  ${p.speedKmh.toStringAsFixed(1)} km/h');
});
stream.alarms.listen ((a) => print('ALARM  ${a.imei} ${a.alarms}'));
stream.motions.listen((m) => print('MOTION ${m.imei} ${m.motionStatus.name}'));
stream.errors.listen ((e) {
  if (e.unauthorized) print('Token invalid / missing live_stream scope');
});

stream.connect();
stream.subscribe('355000000000001');     // by IMEI
// or: stream.subscribeAll(['355...', '355...']);

// later:
await stream.close();

Per-IMEI filters: stream.positionsFor(imei), alarmsFor(imei), motionsFor(imei).

Server-side: up to 5 concurrent streams per vehicle, Socket.IO v2 only (v3/v4 clients are not compatible — that's why this SDK pins socket_io_client: ^1.0.2).

Error handling

All errors derive from NeptrackException:

Exception	Cause
`NeptrackAuthException` (401)	Missing / invalid / revoked token
`NeptrackScopeException` (403)	Token lacks the scope for this endpoint
`NeptrackRateLimitException`	Too many failed auth attempts
`NeptrackApiException`	Endpoint returned `err: true`
`NeptrackException`	Anything else (network, 5xx, etc.)

try {
  await client.listVehicles();
} on NeptrackAuthException {
  // re-prompt for token
} on NeptrackException catch (e) {
  print('Failed: ${e.message}');
}

Stream-side errors arrive on stream.errors as StreamError values (unauthorized: true indicates token / scope issues).

Engine command

sendCommand cuts or restores engine power via the device relay. This is a physical action — never call stop while the vehicle is in motion.

await client.sendCommand(vehId, EngineAction.stop);
await client.sendCommand(vehId, EngineAction.restore);

Resources

Website & dashboard — neptrack.com
Issues — github.com/neptrack/neptrack_core/issues