Nordik UART app with Multiple service reception

RE: Nordik UART app with Multiple service reception

Hung Bui — Tue, 01 Aug 2017 12:55:51 GMT

If you don't have a sniffer trace, I can't help you on this case. You should also print a log in your peripheral. The log should print out when it receive the notification enabling (CCCD writing) and when it start sending each notification.

RE: Nordik UART app with Multiple service reception

Shrikant — Tue, 01 Aug 2017 05:48:37 GMT

but my current problem is when 2 characteristics from different services i have started notification on, my transmission on transmission characteristics goes on toss. can you help me understand how to get over it.

I am developing App for iPhone UART service App.

I have two services. Nordik UART Service and HRM service

When I notify receiver characteristics of both services,my transmission characteristics taking delay of 2 to 10 seconds to transmit data.

when i notify only single receiver characteristics, transmission works fine.but i start notify second receiver characteristics, transmission delayed.

Please go through my below code for reception and transmission. How do i manage multiple services with multiple characteristics, i could not allow to have transmission delay.

//Service Discovery Code:

+ (CBUUID *) uartServiceUUID
{
    return [CBUUID UUIDWithString:@"6e400001-b5a3-f393-e0a9-e50e24dcca9e"];
}
+ (CBUUID *) txCharacteristicUUID
{
    return [CBUUID UUIDWithString:@"6e400002-b5a3-f393-e0a9-e50e24dcca9e"];
}
+ (CBUUID *) rxCharacteristicUUID
{
    return [CBUUID UUIDWithString:@"6e400003-b5a3-f393-e0a9-e50e24dcca9e"];
}
+ (CBUUID *) torqueInformationServiceUUID
{
    return [CBUUID UUIDWithString:@"0000180D-0000-1000-8000-00805f9b34fb"];
}
+ (CBUUID *) torquerxCharacteristicUUID
{
    return [CBUUID UUIDWithString:@"00002A37-0000-1000-8000-00805f9b34fb"];
}
- (UARTPeripheral *) initWithPeripheral:(CBPeripheral*)peripheral delegate:(id<UARTPeripheralDelegate>) delegate
{
    if (self = [super init])
    {
        _peripheral = peripheral;
        _peripheral.delegate = self;
        _delegate = delegate;
//        myperipheral=peripheral;
    }
    return self;
}
- (void) didConnect
{
[_peripheral discoverServices:@[self.class.uartServiceUUID,self.class.torqueInformationServiceUUID]];
    NSLog(@"Did start service discovery.");    
}

- (void) didTSConnect
{
      NSLog(@" discovery start ,,,.........");  
}
- (void) peripheral:(CBPeripheral )peripheral didDiscoverServices:(NSError)error
{
    if (error)
    {
        NSLog(@"Error discovering services: %@", error)        
        return;
    }
    for (CBService *service in peripheral.services)
    {
        NSLog(@"Discovered service: %@", service.UUID);
        [peripheral discoverCharacteristics:nil forService:service];
    } 
     NSLog(@"Discovered service: %@", tsservice.UUID);
  }
- (void) peripheral:(CBPeripheral )peripheral didDiscoverCharacteristicsForService:(CBService )service error:(NSError *)error
{
   if (error)
    {
        NSLog(@"Error discovering characteristics: %@", error);
        receptionStartFlag=false;
        return;  
    }
    for (CBCharacteristic *d in service.characteristics)
        {   
          if ([service.UUID isEqual:self.class.uartServiceUUID])
            {
                if ([d.UUID isEqual:self.class.rxCharacteristicUUID])
                {
                    NSLog(@"Found RX characteristic");
                    self.rxCharacteristic = d;                
                    rxChar=_rxCharacteristic;                
                    [self.peripheral setNotifyValue:YES forCharacteristic:d];
                    [self.peripheral readValueForCharacteristic:d];                
                }
                else   if ([d.UUID isEqual:self.class.txCharacteristicUUID])
                {
                    NSLog(@"Found TX characteristic");
                    self.txCharacteristic = d;
                    txChar=_txCharacteristic;
                    [self.peripheral setNotifyValue:YES forCharacteristic:d];
                }
            }   
        }
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,0),                     ^{
    for (CBCharacteristic *d in service.characteristics)
      {
       if ([service.UUID isEqual:self.class.torqueInformationServiceUUID])
         {
            if ([d.UUID isEqual:self.class.torquerxCharacteristicUUID])
               {
                   NSLog(@"Found  TSRX characteristic");
                   self.rxCharacteristic = d;
                   rxChar=rxCharacteristic;
                  [self.peripheral setNotifyValue:YES forCharacteristic:d];
                  [self.peripheral readValueForCharacteristic:d];
               }
                                          
           }
         }
        });
    
}

- (void) peripheral:(CBPeripheral )peripheral didUpdateValueForCharacteristic:
(CBCharacteristic )characteristic error:(NSError *)error
   {
    if (error)
      {
        NSLog(@"Error receiving notification for characteristic %@: %@", 
        characteristic, error);
        return;
      }
    
    //actual reception 
    NSData *dataRec=self.rxCharacteristic.value;
    
    Byte byteData[[dataRec length]];//(Byte*)malloc(len);
    
    [dataRec getBytes:&byteData];
}

//**Transmission Code**

int8_t bytes2[] ={128,00,00,00,00,00,00,00,00,00,00,00,00};
            NSData *data2 = [NSData dataWithBytes:bytes2 length:sizeof(bytes2)];
            
            if ((txChar.properties & CBCharacteristicPropertyWrite) != 0)
            {
                [myperipheral writeValue:data2 forCharacteristic:txChar
                                    type:CBCharacteristicWriteWithResponse];
            }
            else if ((txChar.properties & CBCharacteristicPropertyWrite) != 0)
            {
                [myperipheral writeValue:data2 forCharacteristic:txChar 
                 type:CBCharacteristicWriteWithResponse];
            }
            else
            {
                NSLog(@"No write property on TX characteristic, %lu.", (unsigned 
                long)txChar.properties);
            }

RE: Nordik UART app with Multiple service reception

Hung Bui — Fri, 28 Jul 2017 07:50:55 GMT

Adding delay isn't a very good solution. You can try: after you write to one service, you wait for the call back before you write to the second one.

RE: Nordik UART app with Multiple service reception

Shrikant — Wed, 26 Jul 2017 12:24:58 GMT

but with same features it giving problem to iOS UART App. when both receiver characteristics notification is on, then transmission is very slow sometimes takes 2 seconds sometimes 10 seconds. doesn't understand how to handle this with ios

RE: Nordik UART app with Multiple service reception

Shrikant — Wed, 26 Jul 2017 12:22:51 GMT

For Android ,

I have resolve this issue with the following code.

BluetoothGattCharacteristic TxCharHRS = RxServiceHRS.getCharacteristic(TX_TSCHAR_UUID); Log.d("CHAR"," "+RxServiceHRS.getCharacteristics()); if (TxCharHRS == null) { showMessage("Tx charateristic not found!"); Log.d("no tx char ","Tx charateristic not found!"); broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART); return; }

            mBluetoothGatt.setCharacteristicNotification(TxCharHRS,true);
            BluetoothGattDescriptor descriptor1 = TxCharHRS.getDescriptor(CCCD);
            descriptor1.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor1);

            Thread.sleep(500);


            BluetoothGattService RxService = mBluetoothGatt.getService(RX_SERVICE_UUID);
            if (RxService == null) {
                showMessage("Rx service not found!");
                broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART);
                return;
            }
            BluetoothGattCharacteristic TxChar = RxService.getCharacteristic(TX_CHAR_UUID);

            if (TxChar == null) {
                showMessage("Tx charateristic not found!");
                Log.d("no tx char ","Tx charateristic not found!");
                broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART);
                return;
            }

            mBluetoothGatt.setCharacteristicNotification(TxChar,true);
            BluetoothGattDescriptor descriptor = TxChar.getDescriptor(CCCD);
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor);

only the 500ms delay got resolved my issue. but same implementation problem in iOS not working.when first service transmission and reception characteristics is ON everything (transmission and reception) is working fine,after second HRS RX characteristics ON,my first service transmission characteristics execution goes on toss. it takes delay of 2 seconds to 10 seconds for transmission happens.How to have both services and there characteristics work without delay.

RE: Nordik UART app with Multiple service reception

Hung Bui — Mon, 22 May 2017 12:50:49 GMT

I mean in the nRF5 application , please check if the sd_ble_gatts_hvx() for both services are called and returned NRF_SUCCESS. Yes you can send the .java , but it would take some time to dig into your code.

RE: Nordik UART app with Multiple service reception

PriyankaB — Mon, 22 May 2017 09:02:51 GMT

Yes,I will capture a sniffer trace once all necessary things are available to me.

As I debug the code,I found below function status as true:

D/BluetoothGatt: setCharacteristicNotification() - uuid: 6e400003-b5a3-f393-e0a9-e50e24dcca9e enable: true D/BluetoothGatt: setCharacteristicNotification() - uuid: 00002a37-0000-1000-8000-00805f9b34fb enable: true

Is this function you are asking about?

Or should I send you the .java file for the same through PM?

RE: Nordik UART app with Multiple service reception

Hung Bui — Mon, 22 May 2017 07:37:59 GMT

@PriyankaB: Please capture a sniffer trace. And please check in your application if .._hvx() function (send notification) for both services are called.

RE: Nordik UART app with Multiple service reception

PriyankaB — Sat, 20 May 2017 11:12:38 GMT

Hello,

I faced the same problem. I am unable to get both services at a time. I have tried to get first only HRS data and it is working. Then I also tried to get UART data individually ,it is also working. But when I use both services at a time,only UART data is received. When I debug the app both services are found. But when I debug the broadcastUpdate function only one if condition get executed either UART or HRS. So, please let me know how to solve this? Thanks in advance.

RE: Nordik UART app with Multiple service reception

Hung Bui — Thu, 11 May 2017 07:32:49 GMT

Hi Shrikant,

Please post your full code, whole project. If you don't want the code be confidential please send it via PM or open a support case in "My Page" on our website.

You need to enable CCCD before you can receive any notification. This could be the reason why you don't receive any HRS characteristic in broadcastUpdate. BroadcastUpdate is called when there is a change in characteristic, and if you don't enable CCCD (the code I posted above) , there will be no change can be notify.

RE: Nordik UART app with Multiple service reception

Shrikant — Thu, 11 May 2017 03:16:07 GMT

Yes sir, I have given you details of enableTXNotification function. there i have updated above CCCD code for HRS profile, i will rewrite here,

public static final UUID CCCDTS = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

BluetoothGattService RxServiceHRS = mBluetoothGatt.getService(RX_TSSERVICE_UUID);
        if (RxServiceHRS == null) {
            showMessage("Rx service not found!");
            broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART);
            return;
        }
        BluetoothGattCharacteristic TxCharHRS = RxServiceHRS.getCharacteristic(TX_TSCHAR_UUID);
            Log.d("CHAR"," "+RxServiceHRS.getCharacteristics());
        if (TxCharHRS == null) {
            showMessage("Tx charateristic not found!");
            Log.d("no tx char ","Tx charateristic not found!");
            broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART);
            return;
        }

            mBluetoothGatt.setCharacteristicNotification(TxCharHRS,true);
            BluetoothGattDescriptor descriptor1 = TxCharHRS.getDescriptor(CCCDTS);
            descriptor1.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor1);

I am working on sniffer , to get some details to post. but when i debug above code, all variable RxserviceHRS, TxcharTS initialises. notification will be enabled. but still in broadcastUpdate function characteristics UUID do not match with TxcharHRS UUID. because all time UART Txchar UUID data is available.

RE: Nordik UART app with Multiple service reception

Hung Bui — Wed, 10 May 2017 11:39:56 GMT

To really solve the problem you need to understand how the code works. And it should be noted that, we, Nordic, don't make Bluetooth API on Android, we only make the chip and the Bluetooth stack on it, not on Android.

The Android apps we provide is just a reference to help you. You still need to dig in, study and understand how Android Bluetooth api works.

For sure it's the issue with the coding not the hardware /stack issue, I requested the sniffer to understand what could be wrong with your code.

I kept asked you if you write to CCCD for HRM characterstic or not , but you never answered. This part should be called for your HRS characteristic:

        mBluetoothGatt.setCharacteristicNotification(TxChar,true);
        BluetoothGattDescriptor descriptor = TxChar.getDescriptor(CCCD);
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        mBluetoothGatt.writeDescriptor(descriptor);

Please post your code, full code.

RE: Nordik UART app with Multiple service reception

Shrikant — Wed, 10 May 2017 02:39:19 GMT

You are not understanding our problem. We are facing problem at multiple reception. while receiving HRS data , no characteristics found on broadcast Update to read value. only UART Service characteristics are identified and can read value. is that ok with broadcastUpdate funtion we have written? is there is missing in onCharacteristicsRead function? is there is another mService object require to read other service? i will see sniffer details and try to test and give details. but i think the problem must be in coding.

RE: Nordik UART app with Multiple service reception

Hung Bui — Mon, 08 May 2017 14:05:00 GMT

No we don't have code with UART and other service at the same time. Please follow the steps I stated above and let me know at which step you have an issue ? I assume at step 3 ? Please try to capture the sniffer trace.

RE: Nordik UART app with Multiple service reception

Shrikant — Mon, 08 May 2017 11:59:14 GMT

I have tested same with Nordik Connect App , there it works for both services , it read both services but i cannot test there transmission for UART because my data is different than what you can transmit.so, i cant check response. i need to transmit byte array for request.

please go through below link for nrf connect response details

drive.google.com/.../0Bx0kGChmcM8BZllqcTVUTlJGQ00

RE: Nordik UART app with Multiple service reception

Shrikant — Mon, 08 May 2017 11:37:36 GMT

first , we have tested with only hrs. it works. but when i tried to use both services it gives problem. i had also rechecked for both services having CCID enabled and it returns true. I am repeating the same, can you provide sample of UART code where multiple services works parallelly. because i am face this problem in both Android and iPhone App development.

RE: Nordik UART app with Multiple service reception

Hung Bui — Mon, 08 May 2017 11:08:25 GMT

Please let me know if you can make it work with just the HRS profile, no UART ? I suggest you to test as follow:

1 - Make a firmware with just HRS (you can use our hrs example) then make an app with just HRS and make sure it works.

2 - Make a firmware with HRS and UART then make an app with just HRS and test

3 - Try to add UART in to the HRS app and test again

I don't see any reason why only UART work but not HRS.

You may want to capture a sniffer trace so I can see what happens over the air. Make sure CCCD is enabled for both services.

RE: Nordik UART app with Multiple service reception

Shrikant — Fri, 05 May 2017 12:08:43 GMT

I am facing same like problem in iPhone App, when we try to read both service characteristics value, we can receive data but cannot write tx characteristics at that time. in UART we have 2 charcterictics tx and rx . single service with its 2 characteristis works fine. when we had added second service (hrs), tx characteristics in uart profile stop working. can we have single reference code for both platforms to work on two service profiles at a time?(we are using UART and HRS profile). when i replace single service on another, only single replaced service will be there it works . only UART or HRS. but i need both services, UART services to read and write characteristics and hrs service with read characteristics.

RE: Nordik UART app with Multiple service reception

Shrikant — Fri, 05 May 2017 11:54:50 GMT

Thanks for explanation regarding characteristics unknown value. but as you recommended i have all the statements to read characterestics (getValue) also some code in readCharacteristics function. I have enableTXNotification function which will enable both service notification. i have seen log for notification enable returning true. but at the end, i am getting only UART chracteristics data in brodcastUpdate. what i am missing to read both services tx chracteristics in an single run.

RE: Nordik UART app with Multiple service reception

Hung Bui — Fri, 05 May 2017 11:23:55 GMT

I would suggest you to try to read and write to the characteristic first. 609367b is not garbage data, it's an address in the memory, what do you expect to see? You won't see the UUID because to get the UUID you should call characteristic.getUuid() you should try to print that in the log.

broadcastUpdate() is called when you get a notification, if you don't send a notification on HRS side (or if you don't enable notification for HRS) there will be no notification for the HRS characteristic.

I suggest you to get familiar with HRS profile, know how to get characteristic, enable notification (write to CCCD), receive notification before you try to combine it with UART.

RE: Nordik UART app with Multiple service reception

Shrikant — Fri, 05 May 2017 06:28:09 GMT

the meaning of my statement is, i have tried to read characteristics in broadcast update function .but, TX_TS CHAR_UUID doesn't match with received characteristics. so, no getValue function is called in that block.it only match with TX_CHAR_UUID which mean it only read UART characteristics value in broadcast update function. i try to log value in enableTXnotification function,which is giving me below in log result

BluetoothGattCharacteristic TxCharHRS = RxServiceHRS.getCharacteristic(TX_TSCHAR_UUID); Log.d("CHAR"," "+TxCharHRS);

Log Result->android.bluetooth.BluetoothGattCharacteristic@609367b

BluetoothGattCharacteristic TxChar = RxService.getCharacteristic(TX_CHAR_UUID); Log.d("CHAR"," "+TxChar);

log result: android.bluetooth.BluetoothGattCharacteristic@ea7dc98]

UUID i have used

public static final UUID TX_TSCHAR_UUID = UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb"); public static final UUID RX_TSSERVICE_UUID = UUID.fromString("0000180D-0000-1000-8000-00805f9b34fb"); public static final UUID TX_CHAR_UUID = UUID.fromString("6e400003-b5a3-f393-e0a9-e50e24dcca9e");

i think garbage means: this value @609367b at characteristics log.

RE: Nordik UART app with Multiple service reception

Hung Bui — Wed, 03 May 2017 14:24:19 GMT

I don't understand what you say here:

in above code i tried to read characteristics from both services . also tried to read characteristics in list fashion(code is commented for the same). we have broadcast update function.

You tried but it's successful or not ?? You have broadcast update function, what does that mean ?

Please answer my question , what you do have when you call RxServiceHRS.getCharacteristics() to get the list ? And what was the UUID when you call "characteristic.getUuid()" ? Tell me what was exactly the " something garbage data " you saw.

RE: Nordik UART app with Multiple service reception

Shrikant — Wed, 03 May 2017 05:05:40 GMT

in above code i tried to read characteristics from both services . also tried to read characteristics in list fashion(code is commented for the same). we have broadcast update function. but when i debug the code HRS characteristics never executed. this below line return always false ,so i am unable to read. if (RX_TSCHAR_UUID.equals(characteristic.getUuid())) so i got something garbage data on this characteristics read not byte array.in represent my TS keyword for hrs profile in my code.

private void broadcastUpdate(final String action,
                                 final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);
        //final Intent intent1 = new Intent(action);

        // This is special handling for the Heart Rate Measurement profile.  Data parsing is
        // carried out as per profile specifications:
        // developer.bluetooth.org/.../CharacteristicViewer.aspx
        if (TX_CHAR_UUID.equals(characteristic.getUuid())) {

            // Log.d(TAG, String.format("Received TX: %d",characteristic.getValue() ));
            intent.putExtra(EXTRA_DATA, characteristic.getValue());
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(CCCD);

            byte[] received= characteristic.getValue();
            String data = (characteristic.getValue() == null || characteristic.getValue().length <= 0) ? "0 bytes" : GeneralCharacteristicParser.parse(characteristic);

            intent.putExtra(SOME_MORE,data);

        }

        if (RX_TSCHAR_UUID.equals(characteristic.getUuid())) {

            // Log.d(TAG, String.format("Received TX: %d",characteristic.getValue() ));
            intent.putExtra(EXTRA_DATA, characteristic.getValue());
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(CCCDTS);

            byte[] received= characteristic.getValue();
            String data = (characteristic.getValue() == null || characteristic.getValue().length <= 0) ? "0 bytes" : GeneralCharacteristicParser.parse(characteristic);

            intent.putExtra(SOME_MORE,data);


        }
        else
        {

        }
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
        //LocalBroadcastManager.getInstance(this).sendBroadcast(intent1);
    }

RE: Nordik UART app with Multiple service reception

Hung Bui — Tue, 02 May 2017 13:58:29 GMT

I don't get what you write here. onCharacteristicRead() is when you read the characteristic.

You mean you can get the characteristic correctly and now doing a characteristic read ?

Why don't you call characteristic.getValue() to get the value ?? This is what I did in the UART app code, check function broadcastUpdate() in UartService.java

RE: Nordik UART app with Multiple service reception

Shrikant — Tue, 02 May 2017 12:16:58 GMT

public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); ListServices = gatt.getServices(); // gatt.readCharacteristic(chars.get(chars.size()-1)); gatt.readCharacteristic(Services.get(2).getCharacteristics().get(0)); gatt.readCharacteristic(Services.get(3).getCharacteristics().get(0)); //gatt.readCharacteristic(services.get(1).getCharacteristics().get(2)); // chars.remove(chars.get(chars.size()-1)); // if (chars.size() > 0) { // gatt.readCharacteristic(chars.get(chars.size()-1)); // } else { // gatt.disconnect(); // }

  }
  }

I have tried to get read, but still is display some alohanumeric value. actually it should display byte array