Advertise Fails DATA_TOO_LARGE

[Chris Renfrow]

I'm following the guide at Server.MD to POC an android app as a heart rate monitor. I get a DATA_TOO_LARGE error on attempting to advertise. Here are the pertinent pieces of the POC:

private val hrmService = UUID.fromString("0000180D-0000-1000-8000-00805f9b34fb")
private val hrmCharacteristic = UUID.fromString("00002A37-0000-1000-8000-00805f9b34fb")
private val service = BluetoothGattService(hrmService, BluetoothGattService.SERVICE_TYPE_PRIMARY)
private val characteristic = BluetoothGattCharacteristic(hrmCharacteristic, PROPERTY_READ or PROPERTY_INDICATE, PERMISSION_READ_ENCRYPTED_MITM)
private val peripheralManager by lazy { BluetoothPeripheralManager(this, getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager, callback) }

fun setupAdvertising() {
        CoroutineScope(Dispatchers.IO).launch {
            hrFlow.collect {
                it?.let {
                    val bytes = ByteBuffer.allocate(Int.SIZE_BYTES).apply {
                        putShort(it)
                    }.array()
                    peripheralManager.notifyCharacteristicChanged(bytes, characteristic)
                }
            }
        }

        service.addCharacteristic(characteristic)
        peripheralManager.add(service)

        val advertiseSettings = AdvertiseSettings.Builder()
            .setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED)
            .setConnectable(true)
            .setTimeout(0)
            .setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_MEDIUM)
            .build()

        val advertiseData = AdvertiseData.Builder()
            .setIncludeTxPowerLevel(true)
            .addServiceUuid(ParcelUuid(hrmService))
            .build()

        val scanResponse = AdvertiseData.Builder()
            .setIncludeDeviceName(true)
            .build()

        peripheralManager.startAdvertising(advertiseSettings, scanResponse, advertiseData)
    }

[Martijn van Welie]

The total advertisement size cannot be larger than 31 bytes and 31 bytes for the scan reponse. So apparently one of them is too long. I can't see in your code snippet what you use as the local name but maybe it is that one....

[Chris Renfrow]

Looks like it was the name of my phone that was the problem.