/// <summary> Subscribes to the changes notifications of the given characteristic. </summary>
/// <param name="Characteristic"> The characteristic. </param>
/// <returns> If the method completed with success the returning value is
/// <see cref="wclErrors.WCL_E_SUCCESS" />. If the method failed the returning value is
/// one of the Bluetooth Framework error code. </returns>
/// <seealso cref="wclGattCharacteristic"/>
protected Int32 SubscribeForNotifications(wclGattCharacteristic?Characteristic)
{
if (Characteristic == null)
{
return(wclBluetoothErrors.WCL_E_BLUETOOTH_LE_ATTRIBUTE_NOT_FOUND);
}
// Windows does not support dual indicatable and notifiable chars so select one.
wclGattCharacteristic chr = Characteristic.Value;
if (chr.IsIndicatable && chr.IsNotifiable)
{
chr.IsIndicatable = false;
}
Int32 Res = FClient.Subscribe(chr);
if (Res == wclErrors.WCL_E_SUCCESS)
{
Res = FClient.WriteClientConfiguration(chr, true, wclGattOperationFlag.goNone);
if (Res != wclErrors.WCL_E_SUCCESS)
{
FClient.Unsubscribe(chr);
}
}
return(Res);
}
private void Subscribe(bool doSubscribe)
{
if (doSubscribe)
{
int Res = Client.Subscribe(ReadCh);
if (Res != wclErrors.WCL_E_SUCCESS)
{
subscription = "Subscription failed";
return;
}
else if (!hasCCCD)
{
subscription = "Subscription without CCCD succeeded";
return;
}
Res = Client.WriteClientConfiguration(ReadCh, true, wclGattOperationFlag.goReadFromDevice);
if (Res != wclErrors.WCL_E_SUCCESS)
{
subscription = "CCCD write failed";
return;
}
Res = Client.ReadDescriptorValue(CCCDdescriptor, wclGattOperationFlag.goReadFromDevice, out wclGattDescriptorValue cccdVal);
if (Res != wclErrors.WCL_E_SUCCESS)
{
subscription = "CCCD read failed";
return;
}
subscription = cccdVal.ClientCharacteristicConfiguration.IsSubscribeToNotification
? "CCCD subscribed to notification" : "CCCD not subscribed";
}
else
{
int Res = Client.Unsubscribe(ReadCh);
if (Res != wclErrors.WCL_E_SUCCESS)
{
subscription = "Unsubscription failed";
return;
}
if (hasCCCD)
{
Res = Client.WriteClientConfiguration(ReadCh, false, wclGattOperationFlag.goReadFromDevice);
if (Res != wclErrors.WCL_E_SUCCESS)
{
subscription = "CCCD write failed";
return;
}
}
subscription = "Unsubscription succeeded";
}
}
void FClient_OnConnect(object Sender, int Error)
{
if (Error != wclErrors.WCL_E_SUCCESS)
{
Trace("Connection failed: 0x" + Error.ToString("X8"));
CloseBluetoothManager();
}
else
{
FSubscribed = new List <wclGattCharacteristic>();
Trace("Connected with success");
Trace("Read services");
wclGattService[] Services;
Int32 Res = FClient.ReadServices(wclGattOperationFlag.goNone, out Services);
if (Res != wclErrors.WCL_E_SUCCESS)
{
Trace("Read services failed: 0x" + Res.ToString("X8"));
}
else
{
foreach (wclGattService Service in Services)
{
Trace("Service " + ShowUuid(Service.Uuid));
wclGattCharacteristic[] Chars;
Res = FClient.ReadCharacteristics(Service, wclGattOperationFlag.goNone, out Chars);
if (Res != wclErrors.WCL_E_SUCCESS)
{
Trace(" Unable to read characteristics: 0x" + Res.ToString("X8"));
}
else
{
foreach (wclGattCharacteristic Char in Chars)
{
Trace(" Characteristic " + ShowUuid(Char.Uuid));
if (Char.IsReadable)
{
Trace(" Readable");
}
if (Char.IsWritable || Char.IsSignedWritable || Char.IsWritableWithoutResponse)
{
Trace(" Writable");
}
if (Char.IsIndicatable || Char.IsNotifiable)
{
Trace(" Notifiable");
Trace(" Subscribe");
Res = FClient.Subscribe(Char);
if (Res != wclErrors.WCL_E_SUCCESS)
{
Trace(" Subscribed failed: 0x" + Res.ToString("X8"));
}
else
{
Res = FClient.WriteClientConfiguration(Char, true, wclGattOperationFlag.goNone, wclGattProtectionLevel.plNone);
if (Res != wclErrors.WCL_E_SUCCESS)
{
Trace(" Write CCD failed: 0x" + Res.ToString("X8"));
FClient.Unsubscribe(Char);
}
else
{
Trace(" Subscribed");
FSubscribed.Add(Char);
}
}
}
}
}
}
}
btDisconnect.Enabled = true;
}
}