/// <summary>
/// Sends message to the bluetooth device.
/// Displays the number of bytes sent/erroor
/// </summary>
/// <returns>Tasks that can be awaited</returns>
private async Task SendMessageAsync()
{
try
{
var count = await _btManager.SendOnOffAsync(_isOn);
ErrorMessage = "Sent " + count + " bytes.";
}
catch (Exception ex)
{
ErrorMessage = ex.Message;
}
}