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import 'dart:async';
import 'dart:io';
import 'package:esense_flutter/esense.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
class ESenseInput {
static final instance = ESenseInput._();
ESenseManager eSenseManager = ESenseManager('unknown');
ValueNotifier<String> deviceStatus = ValueNotifier('');
String eSenseDeviceName = '';
bool connected = false;
bool sampling = false;
ESenseInput._() {
_listenToESense();
}
Future<void> _askForPermissions() async {
if (!Platform.isAndroid && !Platform.isIOS) return;
if (!(await Permission.bluetoothScan.request().isGranted &&
await Permission.bluetoothConnect.request().isGranted)) {
print(
'WARNING - no permission to use Bluetooth granted. Cannot access eSense device.');
}
// for some strange reason, Android requires permission to location for Bluetooth to work.....?
if (Platform.isAndroid) {
if (!(await Permission.locationWhenInUse.request().isGranted)) {
print(
'WARNING - no permission to access location granted. Cannot access eSense device.');
}
}
}
StreamSubscription _listenToESense() {
// if you want to get the connection events when connecting,
// set up the listener BEFORE connecting...
return eSenseManager.connectionEvents.listen((event) {
print('CONNECTION event: $event');
// when we're connected to the eSense device, we can start listening to events from it
// if (event.type == ConnectionType.connected) _listenToESenseEvents();
connected = false;
switch (event.type) {
case ConnectionType.connected:
deviceStatus.value = 'connected';
connected = true;
break;
case ConnectionType.unknown:
deviceStatus.value = 'unknown';
break;
case ConnectionType.disconnected:
deviceStatus.value = 'disconnected';
sampling = false;
break;
case ConnectionType.device_found:
deviceStatus.value = 'device_found';
break;
case ConnectionType.device_not_found:
deviceStatus.value = 'device_not_found';
break;
}
});
}
Future<void> connectToESense(String deviceName) async {
if (!connected) {
await _askForPermissions();
print('Trying to connect to eSense device namend \'$deviceName\'');
eSenseDeviceName = deviceName;
eSenseManager.deviceName = deviceName;
connected = await eSenseManager.connect();
print('Trying to connect to eSense device namend \'${eSenseManager.deviceName}\'');
deviceStatus.value = connected ? 'connecting...' : 'connection failed';
print(deviceStatus.value);
}
}
}
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