CC2340R5: Inconsistent BLE Service Discovery on TI Module with Android 13/14 (Status 22 Error)

Debasish Paul

Part Number: CC2340R5

Tool/software:

Hi!

I'm encountering a recurring issue during BLE communication between our mobile application and a TI device module.

While initiating a connection, I’ve observed that the GATT connection is established immediately. However, when the mobile application attempts to discover the service list, the device is not responding. As a result, after a few seconds, the connection fails and is terminated with status code 22.

This issue occurs consistently on most of the android phones with Android version 13 & 14, and the connection only succeeds occasionally. This problem is not observed on the Motorola G54 phone. The device connects and communicates successfully every time on that particular model.

I have also tested using the SimpleLink Connect and LightBlue apps and observed the same issue.

I am also attaching the log file for your reference. Could you please advise on what might be causing this behavior or suggest any steps to resolve or further investigate the issue?

66c1509101521_code-editor-fs">Fullscreen /__key/communityserver-discussions-components-files/538/logs-FOTA-Mobile-App.txt?_=638912915619811660" App.txt">logs FOTA Mobile App.txt /__key/communityserver-discussions-components-files/538/logs-FOTA-Mobile-App.txt?_=638912915619811660" App.txt">Download 509101521_code-editor" ;" 5G Android Version 14) com.smit.fota_Simulation D Connecting to 10:CA:BF:77:AA:C9 com.smit.fota_Simulation D connect() - device: xx:xx:xx:xx:AA:C9, auto: false com.smit.fota_Simulation D registerApp() com.smit.fota_Simulation D registerApp() - UUID=2748bbac-bef8-45a7-91c8-f87f0569ebc1 com.smit.fota_Simulation D isLeEnabled(): ON com.smit.fota_Simulation D onClientRegistered() - status=0 clientIf=7 com.smit.fota_Simulation D Stopping BLE scan... com.smit.fota_Simulation D Scan is not running. com.smit.fota_Simulation D New Scan Result: 10:CA:BF:77:A9:B2 com.smit.fota_Simulation D Ui Updated com.smit.fota_Simulation D onClientConnectionState() - status=0 clientIf=7 device=xx:xx:xx:xx:AA:C9 com.smit.fota_Simulation D onConnectionStateChange: triggered com.smit.fota_Simulation D Connected to 10:CA:BF:77:AA:C9 com.smit.fota_Simulation D discoverServices() - device: xx:xx:xx:xx:AA:C9 com.smit.fota_Simulation D onConnectionUpdated() - Device=xx:xx:xx:xx:AA:C9 interval=6 latency=0 timeout=500 status=0 com.smit.fota_Simulation D onSearchComplete() = Device=xx:xx:xx:xx:AA:C9 Status=0 com.smit.fota_Simulation D Services discovered com.smit.fota_Simulation D Service UUID: 00001800-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D Characteristic UUID: 00002a00-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D Characteristic UUID: 00002a01-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D Characteristic UUID: 00002a04-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D Characteristic UUID: 00002aa6-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D Characteristic UUID: 00002ac9-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D chars List :[android.bluetooth.BluetoothGattCharacteristic@7543f20, android.bluetooth.BluetoothGattCharacteristic@cdad0d9, android.bluetooth.BluetoothGattCharacteristic@5a33a9e, android.bluetooth.BluetoothGattCharacteristic@690497f, android.bluetooth.BluetoothGattCharacteristic@90e2d4c] com.smit.fota_Simulation D Service UUID: 00001801-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D Characteristic UUID: 00002a05-0000-1000-8000-00805f9b34fb com.smit.fota_Simulation D chars List :[android.bluetooth.BluetoothGattCharacteristic@7543f20, android.bluetooth.BluetoothGattCharacteristic@cdad0d9, android.bluetooth.BluetoothGattCharacteristic@5a33a9e, android.bluetooth.BluetoothGattCharacteristic@690497f, android.bluetooth.BluetoothGattCharacteristic@90e2d4c, android.bluetooth.BluetoothGattCharacteristic@19ea195] com.smit.fota_Simulation D Service UUID: f000ffd0-0451-4000-b000-000000000000 com.smit.fota_Simulation D Setmode: called USER_APPLICATION com.smit.fota_Simulation D Characteristic UUID: f000ffd1-0451-4000-b000-000000000000 com.smit.fota_Simulation D chars List :[android.bluetooth.BluetoothGattCharacteristic@7543f20, android.bluetooth.BluetoothGattCharacteristic@cdad0d9, android.bluetooth.BluetoothGattCharacteristic@5a33a9e, android.bluetooth.BluetoothGattCharacteristic@690497f, android.bluetooth.BluetoothGattCharacteristic@90e2d4c, android.bluetooth.BluetoothGattCharacteristic@19ea195, android.bluetooth.BluetoothGattCharacteristic@40462aa] com.smit.fota_Simulation D onConnectionUpdated() - Device=xx:xx:xx:xx:AA:C9 interval=39 latency=0 timeout=500 status=0 & 13) com.smit.fota_Simulation D connect() - device: xx:xx:xx:xx:AA:C9, auto: false com.smit.fota_Simulation D registerApp() com.smit.fota_Simulation D registerApp() - UUID=827c5b85-f164-4286-94e1-3219ed4c8a14 com.smit.fota_Simulation D onClientRegistered() - status=0 clientIf=6 com.smit.fota_Simulation D onClientConnectionState() - status=0 clientIf=6 device=xx:xx:xx:xx:AA:C9 com.smit.fota_Simulation D onConnectionStateChange: triggered 2 com.smit.fota_Simulation D Connected to 10:CA:BF:77:AA:C9 com.smit.fota_Simulation D GATT: android.bluetooth.BluetoothGatt@5b6500f com.smit.fota_Simulation D discoverServices() - device: com.smit.fota_Simulation D Connected to XX:XX:XX:XX:AA:C9 com.smit.fota_Simulation D onConnectionUpdated() - Device=xx:xx:xx:xx:AA:C9 interval=6 latency=0 timeout=500 status=0 com.smit.fota_Simulation D onSearchComplete() = Device=xx:xx:xx:xx:AA:C9 Status=0 com.smit.fota_Simulation D Services discovered com.smit.fota_Simulation D onClientConnectionState() - status=22 clientIf=6 device=xx:xx:xx:xx:AA:C9 com.smit.fota_Simulation D onConnectionStateChange: triggered 0 com.smit.fota_Simulation D Disconnected from 10:CA:BF:77:AA:C9 com.smit.fota_Simulation D close() com.smit.fota_Simulation D unregisterApp() - mClientIf=6 com.smit.fota_Simulation E Connection failed with status: 22 com.smit.fota_Simulation I getInstance: ac832d29ed8584666c1509101521_code-editor-fs'); 29ed8584666c1509101521_code-editor'); { false); true);

26 days ago

0 Maxence Mathieu 25 days ago

TI__Expert 5000 points

Hi !

The error 0x22 and 0x08 mean that the connection or request has timed out (see GATT error codes in Android-BLE-Library). However, error 22 (and not 0x22) means that your central has chosen to disconnect . This disconnection happens half a second after your device called discoverServices, could you tell me the connection parameters you are using ? If the timeout value for the connection parameters are a lot less or a lot more than 500ms, I don't think timing out is the issue here.

The first debugging step I would take is to check that you pass the right parameters to the discoverServices function : in the success logs, the discoverServices call log gives the device it's discovering (discoverServices() - device: xx:xx:xx:xx:AA:C9). In the failure logs, the device logs are empty (discoverServices() - device: ).

Kind regards,
Maxence

0 Debasish Paul 25 days ago in reply to Maxence Mathieu

Prodigy 20 points

Hi Maxence,

Thanks for pointing that out.

I’m currently calling gatt.discoverServices() in the standard way in Kotlin. I am also attaching my code snippet for your reference.

Please let me know if any further information is required.

Fullscreen BLE Code Snippets.txt Download

//Function to connect with a selected device.

fun connectToDevice(device: BluetoothDevice): Boolean {

        try {
            logManager.saveLogToFile("Connect to device initiated with MAC ID: ${device.address ?: ""} name: ${device.name ?: ""}")
        } catch (_: Exception) {
        }
        _isConnecting.value = true
        _connectionStatus.value = "Connecting..."

        Log.d(TAG, "Connecting to ${device.address}")
        
        device.connectGatt(context, false, bluetoothGattCallback)
      
        connecteddDevice = device
        stopScan()

        return true
    }

 
//Bluetooth Gatt Callback to handle bluetooth responses

private val bluetoothGattCallback = object : BluetoothGattCallback() {

        @SuppressLint("MissingPermission")
        override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
            super.onConnectionStateChange(gatt, status, newState)
            Log.d(TAG, "onConnectionStateChange: triggered $newState")
            if (newState == BluetoothGatt.STATE_CONNECTING) {
                _connectionStatus.value = "Connecting..."
                Log.d(TAG, "onConnectionStateChange: Connecting")
            }
            if (newState == BluetoothGatt.STATE_DISCONNECTING) {
                _connectionStatus.value = "Disconnecting..."
                Log.d(TAG, "onConnectionStateChange: Disconnecting")
            }

            if (newState == BluetoothGatt.STATE_CONNECTED) {
                Log.d(TAG, "Connected to ${gatt.device.address}")
                bluetoothGatt = gatt
                storage.saveStringData(storage.macId, gatt.device.address)
                Log.d(TAG, "GATT: " + gatt);
                gatt.discoverServices()
                Log.d(TAG, "Connected to ${gatt.device}")
            }
            if (newState == BluetoothGatt.STATE_DISCONNECTED) {
                _connectionStatus.value = "Disconnected"
                _isConnecting.value = false
                Log.d(TAG, "Disconnected from ${gatt.device.address}")
                try {
                    bluetoothGatt?.close()
                    bluetoothGatt = null
                    connecteddDevice = null
                } catch (_: Exception) {
                }

                if (status != BluetoothGatt.GATT_SUCCESS) {
                    Log.e(TAG, "Connection failed with status: $status")
                }
            }
        }



        override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
            super.onServicesDiscovered(gatt, status)
            if (status == BluetoothGatt.GATT_SUCCESS) {
                Log.d(TAG, "Services discovered")
                // Now discover characteristics for each service
                for (service in gatt.services) {
                    Log.d(TAG, "Service UUID: ${service.uuid}")
                    if (service.uuid.toString()
                            .uppercase() == TiBleConstants.ResetService.SERVICE_ID.uppercase()
                    ) {
                        applicationViewModel.setMode(DeviceMode.USER_APPLICATION)
                    }
                    if (service.uuid.toString()
                            .uppercase() == TiBleConstants.OADService.SERVICE_ID.uppercase()
                    ) {
                        applicationViewModel.setMode(DeviceMode.PERSISTENT_APPLICATION)
                    }

                    // Discover characteristics
                    for (characteristic in service.characteristics) {
                        Log.d(TAG, "Characteristic UUID: ${characteristic.uuid}")
                        list.add(characteristic)
                    }
                    Log.d(TAG, "chars List  :${list} ")
                    val updatedServices = _serviceList.value.toMutableMap()
                    updatedServices[service.uuid.toString()] = list
                    _serviceList.value = updatedServices
                }

                _connectionStatus.value = "Connected"
                _isConnecting.value = false
                if (applicationViewModel.deviceMode.value == DeviceMode.PERSISTENT_APPLICATION) {
                    subscribeForNotificationResponse()
                }

            } else {
                Log.e(TAG, "Failed to discover services with status $status")
            }
        }


        
    }

Thanks & Regards

Debasish Paul

0 Maxence Mathieu 24 days ago in reply to Debasish Paul

TI__Expert 5000 points

Hi,

I cannot really help you with your code, as I have never used Kotlin nor the BLE library you are using.

As I said previously, I would first check things like the return value of your call to discoverServices, which seem to be erroneous on another device. Maybe different android version change the way your library is used. Next, If no amount of Kotlin debugging helps, I would try to use a BLE sniffer to see the packets that are being exchanged, and which is causing the problem.

You can also try to ask your question on a forum for the BLE library you are using to connect, as the issue seems to come from your central and not the CC2340R5 peripheral.

Kind regards.

Bluetooth®︎

Bluetooth forum

CC2340R5: Inconsistent BLE Service Discovery on TI Module with Android 13/14 (Status 22 Error)