Authenticate and Query JSON data from Storage integration into Flutter

Hi,

first of all, love this thriving community. I am an entrepreneur trying to wear many hats. I have a device which is generating traffic and an active storage integration.

Ultimately I would like a flutter app coded in dart that will query by device and return a dropdown list containing the frm_payload field.

Here is the code that I am using to do this in flutter:

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart';

void main() => runApp(const MyApp());

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatefulWidget(),
    );
  }
}

/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

/// This is the private State class that goes with MyStatefulWidget.
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  int _selectedIndex = 0;
  static const TextStyle optionStyle =
      TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
  static const List<Widget> _widgetOptions = <Widget>[
    Text(
      'Index 0: Homexx',
      style: optionStyle,
    ),
    Text(
      'Index 1: Business',
      style: optionStyle,
    ),
    Text(
      'Index 2: School',
      style: optionStyle,
    ),
    Text(
      'Index 3: Settings',
      style: optionStyle,
    ),
  ];

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  final url =
      "https://eu1.cloud.thethings.network/api/v3/as/applications/jandraapp/devices/unitx1/packages/storage/uplink_message";

  Map<String, String> headers = {
    'Authorization':
        'Token token=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  };

  var _postsJson = [ ];

  void fetchPosts() async {
    print('FETCHPOSTS_PRETRY');
    // try {
    final response = await get(Uri.parse(url), headers: headers);
    final jsonData = jsonDecode(response.body);
    // final jsonData = jsonDecode("[" + response.body + "]");

    print('AFTER_FETCHPOSTS');

    // print("frm_payload: ${jsonData["result"]["end_device_ids"]["device_id"]}");
    print(jsonData.toString());

    setState(() {
      print('BEFORE_FETCHPOSTS');
      _postsJson = jsonData;

      print('FETCHPOSTS');
    });
    // } catch (err) {
    //   print(' FORMATTING ERROR');
    // }
  }

  @override
  void initState() {
    super.initState();
    fetchPosts();
  }

  @override
  Widget build(BuildContext context) {
    print(_postsJson.length);
    return Scaffold(
      appBar: AppBar(
        title: const Text('Device Status Screen'),
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
            backgroundColor: Colors.red,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.history),
            label: 'History',
            backgroundColor: Colors.green,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings),
            label: 'Settings',
            backgroundColor: Colors.pink,
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.amber[800],
        onTap: _onItemTapped,
      ),
    );
  }
}

I get this error:

{error: {grpc_code: 16, http_code: 401, message: error:pkg/identityserver:unsupported_authorization (unsupported authorization method), http_status: Unauthorized, details: [{@type: type.googleapis.com/ttn.lorawan.v3.ErrorDetails, namespace: pkg/identityserver, name: unsupported_authorization, message_format: unsupported authorization method, correlation_id: 30f7ba0ea8a54c59b94907a320f4cdd4, code: 16}]}}

I am getting the key from the console:

image

Any help in fixing this error / pointing to sample code that could get me someway in getting the payload extracted for all devices in a dropdown in flutter. Thanks!!!

Does your key start NNSXS?

Can you do it with cURL?

Have you read the documentation?

I’ve reformatted your post using </> as per guidelines