kombu_flutter_schema 1.2.0

KOMBU IoT System - GraphQL Schema for Flutter/Dart (Mobile-focused). Provides models, queries, and mutations for mobile app development with AWS Amplify.

KOMBU Flutter Schema (Mobile-focused)

GraphQL schema package for KOMBU IoT System mobile app. This package provides only the APIs and models relevant to mobile app functionality.

📦 Installation

Add to your pubspec.yaml:

dependencies:
  kombu_flutter_schema:
    path: ../packages/flutter-schema  # Local development
    # or
    # git:
    #   url: https://github.com/your-org/kombu
    #   path: packages/flutter-schema

Then run:

flutter pub get

🚀 Usage

Import

import 'package:kombu_flutter_schema/kombu_flutter_schema.dart';
import 'package:amplify_flutter/amplify_flutter.dart';

Query User

// Get current user
final response = await Amplify.API.query(
  request: GraphQLRequest(
    document: UserQueries.getUser,
    variables: {'id': userId},
  ),
).response;

if (response.hasErrors) {
  print('Error: ${response.errors}');
} else {
  final userData = response.data?['getUser'];
  final user = User.fromJson(userData as Map<String, dynamic>);
  print('User: ${user.fullName}');
}

Update User Profile

final response = await Amplify.API.mutate(
  request: GraphQLRequest(
    document: UserMutations.updateUser,
    variables: {
      'input': {
        'id': userId,
        'fullName': 'New Name',
        'phoneNumber': '[phone]',
      },
    },
  ),
).response;

List Devices

final response = await Amplify.API.query(
  request: GraphQLRequest(
    document: DeviceQueries.listDevices,
    variables: {
      'filter': {
        'userId': {'eq': userId},
      },
      'limit': 20,
    },
  ),
).response;

if (!response.hasErrors) {
  final items = response.data?['listDevices']?['items'] as List?;
  final devices = items?.map((item) => Device.fromJson(item as Map<String, dynamic>)).toList();
  print('Devices: ${devices?.length}');
}

Create Device

final response = await Amplify.API.mutate(
  request: GraphQLRequest(
    document: DeviceMutations.createDevice,
    variables: {
      'input': {
        'deviceId': 'ESP32-ABC123',
        'userId': currentUserId,
        'deviceName': 'Living Room Heater',
        'deviceType': 'kombu_brewer',
        'location': 'Living Room',
        'status': 'offline',
      },
    },
  ),
).response;

if (!response.hasErrors) {
  final deviceData = response.data?['createDevice'];
  final device = Device.fromJson(deviceData as Map<String, dynamic>);
  print('Device created: ${device.deviceName}');
}

Update Device

final response = await Amplify.API.mutate(
  request: GraphQLRequest(
    document: DeviceMutations.updateDevice,
    variables: {
      'input': {
        'id': deviceId,
        'deviceName': 'New Device Name',
        'location': 'Kitchen',
      },
    },
  ),
).response;

Push Command to IoT Device

Option 1: Using Helper Method (Recommended)

import 'package:kombu_flutter_schema/kombu_flutter_schema.dart';

// Push command using helper method (automatically handles payload stringification)
final result = await PushCommandHelper.pushCommand(
  topic: 'kombu/device-id/down/command',
  payload: {
    'command': 'setTemperature',
    'temperature': 75,
    'heater': 'f1',
  },
);

if (result.success) {
  print('Command sent successfully! Message ID: ${result.messageId}');
} else {
  print('Failed to send command: ${result.error}');
}

Option 2: Using Raw GraphQL Mutation

import 'package:kombu_flutter_schema/kombu_flutter_schema.dart';
import 'package:amplify_flutter/amplify_flutter.dart';
import 'dart:convert';

// Push command using raw GraphQL mutation
final payload = jsonEncode({
  'command': 'setTemperature',
  'temperature': 75,
  'heater': 'f1',
});

final response = await Amplify.API.mutate(
  request: GraphQLRequest<String>(
    document: DeviceMutations.pushCommand,
    variables: {
      'topic': 'kombu/device-id/down/command',
      'payload': payload,
    },
  ),
).response;

if (!response.hasErrors) {
  final data = jsonDecode(response.data!);
  final result = PushCommandResponse.fromJson(data['pushCommand']);
  print('Success: ${result.success}, Message ID: ${result.messageId}');
} else {
  print('Error: ${response.errors}');
}

Register Device Token (Push Notification)

import 'package:kombu_flutter_schema/kombu_flutter_schema.dart';

final helper = PushNotificationHelper();
await helper.registerDeviceToken(userId);

Get Notifications

final response = await Amplify.API.query(
  request: GraphQLRequest(
    document: NotificationQueries.notificationsByUser,
    variables: {
      'userId': userId,
      'limit': 20,
    },
  ),
).response;

if (!response.hasErrors) {
  final items = response.data?['notificationsByUser']?['items'] as List?;
  final notifications = items?.map((item) => Notification.fromJson(item as Map<String, dynamic>)).toList();
}

Mark Notification as Read

final response = await Amplify.API.mutate(
  request: GraphQLRequest(
    document: NotificationMutations.updateNotification,
    variables: {
      'input': {
        'id': notificationId,
        'status': 'read',
        'readAt': DateTime.now().toIso8601String(),
      },
    },
  ),
).response;

📚 Available APIs

Models

• User: User profile information
• Device: IoT device information
• DeviceToken: Push notification device tokens
• Notification: User notifications

Queries

User

• UserQueries.getUser - Get user by ID

Device

• DeviceQueries.getDevice - Get device by ID
• DeviceQueries.listDevices - List devices for user

DeviceToken

• DeviceTokenQueries.getDeviceToken - Get device token by ID
• DeviceTokenQueries.listDeviceTokens - List device tokens
• DeviceTokenQueries.tokensByUser - Query tokens by user

Notification

• NotificationQueries.getNotification - Get notification by ID
• NotificationQueries.listNotifications - List notifications
• NotificationQueries.notificationsByUser - Query notifications by user (sorted by sentAt)

Mutations

User

• UserMutations.updateUser - Update user profile

Device

• DeviceMutations.createDevice - Create new device
• DeviceMutations.updateDevice - Update device (name, location, etc.)
• DeviceMutations.pushCommand - Push command to AWS IoT Core topic (GraphQL mutation)

DeviceToken

• DeviceTokenMutations.createDeviceToken - Register device token
• DeviceTokenMutations.updateDeviceToken - Update device token
• DeviceTokenMutations.deleteDeviceToken - Unregister device token

Notification

• NotificationMutations.updateNotification - Update notification (mark as read)

Helpers

Push Command Helper

• PushCommandHelper.pushCommand() - Push command using helper method (recommended)
• PushCommandHelper.pushCommandRaw() - Push command using raw GraphQL mutation (advanced)

🔒 Authentication

All GraphQL operations require authentication via AWS Cognito. Make sure to:

1. Initialize Amplify with Cognito configuration
2. Sign in user before making API calls
3. Include authentication headers in requests (handled automatically by Amplify)

📝 Notes

What's NOT Included

This mobile-focused schema does NOT include:

• DeviceTelemetry: Use MQTT subscriptions for real-time telemetry
• DeviceConfiguration: Backend/internal only
• Timer: May be added in future versions
• Alert: May be added in future versions
• Firmware: Admin-only operations

User Creation

User creation is handled by AWS Cognito sign-up, not GraphQL. Use Amplify.Auth.signUp() instead.

Real-time Data

For real-time device telemetry and status updates, use MQTT subscriptions via Amplify PubSub, not GraphQL queries.

🛠️ Development

Build

cd packages/flutter-schema
flutter pub get
flutter analyze

Format

dart format lib/

📄 License

See LICENSE file for details.