Clicker Battery By BlueTooth

Unity Engine
1

Hi,
I’m trying to read battery level from the clicker, but it seems, unsuccessfully…

I’m using the microsoft example from here:
https://docs.microsoft.com/pt-pt/windows/uwp/devices-sensors/gatt-scenarios

and because I can run UWP async methods on Unity, I created a Task running on the background, reading the battery level every xxx minutes…

var devices = await DeviceInformation.FindAllAsync(GattDeviceService.GetDeviceSelectorFromUuid(GattServiceUuids.Battery));
var service = await GattDeviceService.FromIdAsync(devices[0].Id);
var clickerCharacteristic = service.GetCharacteristics(GattCharacteristicUuids.BatteryLevel)[0];
var BatteryLevel = await clickerCharacteristic.ReadValueAsync();
byte levelData = Windows.Storage.Streams.DataReader.FromBuffer(BatteryLevel.Value).ReadByte();
UpdateClickerBattery((double)levelData);

I also enabled the Capability on the Manifest:





And always get the same value [ 71 ] .
I tryed to charge the clicker, a still give 71 % of battery…

I also already checked that the service is the “Clicker” service, because if I print the devices[0].Name it will return “Clicker”…

Any help would be very appreciated…

Cheers.

2

According to the doc’s you need to get the updates from the bluetooth device.

You might want to try this example:
C#
async void Initialize()
{
var batteryServices = await Windows.Devices.Enumeration
.DeviceInformation.FindAllAsync(GattDeviceService
.GetDeviceSelectorFromUuid(GattServiceUuids.Battery),
null);

if (batteryServices.Count > 0)
{
// Use the first Battery service on the system
GattDeviceService batteryService = await GattDeviceService
.FromIdAsync(batteryServices[0].Id);

// Use the first Characteristic of that Service
GattCharacteristic batteryLevelCharacteristic =
batteryService.GetCharacteristics(
GattCharacteristicUuids.BatteryLevel)[0];

batteryLevelCharacteristic.ValueChanged += batteryLevelChanged;
}
else
{
statusTextBlock.Text = “No Battery services found !”;
}
}

void batteryLevelChanged(
GattCharacteristic sender,
GattValueChangedEventArgs eventArgs)
{
byte levelData = Windows.Storage.Streams.DataReader
.FromBuffer(eventArgs.CharacteristicValue).ReadByte();

double levelValue;

if (sender.PresentationFormats.Count > 0)
{
levelValue = levelData *
Math.Pow(10.0, sender.PresentationFormats[0].Exponent);
}
else
{
levelValue = (double)levelData;
}

batteryLevelTextBlock.Text = levelValue.ToString();
}

3

Thanks for your help,

but I already try that…

My callback " batteryLevelChanged" is never called…

But I was guessing that the callback is not being called because I’m running in a thread , not in the Unity main thread…

Because I can’t ( don’t now how to ) run async methods from the main thread, I’m lauching it in a separate thread…

ClickerBatteryTask = Task.Factory.StartNew( () => GetClickerBatteryLevelForEver() );

In this case my method " GetClickerBatteryLevelForEver " is the “Initialize” from the example.

And the callback is never called…
But maybe because the callback is defined on the main thread…

I will try passing the object as argument of the thread, so see if the callback is called…

Like This:

ClickerBatteryTask= Task.Factory.StartNew( () => GetClickerBatteryLevelForEver(this) );

And then :

private async void GetClickerBatteryLevelForEver( PowerManager pm )
{
{…}

batteryLevelCharacteristic.ValueChanged += **pm.**batteryLevelChanged;

{…}
}