CODEWITHSUNDEEP
androidiosmacos
Ranga
Ranga

Reputation: 11

Set characteristic notification on Mac BLE Central for an Android(6.0) BLE peripheral characteristics fails

Problem:

I got Mac book (OS X 10.11.6) acts as BLE Central device and Android Phone (Os 6.0) acts as Peripheral device.

Android Peripheral advertises characteristic-1 with properties BluetoothGattCharacteristic.PROPERTY_WRITE | BluetoothGattCharacteristic.PROPERTY_NOTIFY

Mac book(BLE Central) discovers Android Peripheral successfully with characteristic-1. However, when BLE Central tries to do setNotifyValue:YES for this characteristic fails with below error.

Error changing notification state:Error Domain=CBErrorDomain Code=0 "Unknown error." UserInfo={NSLocalizedDescription=Unknown error.}

Incase, if the Peripheral device is an iPhone(iOS) which has similar characteristic then setNotifyValue:YES gets succeeded.

I tried the below combinations for the characteristic-1 with

1- BluetoothGattCharacteristic.PROPERTY_WRITE | BluetoothGattCharacteristic.PROPERTY_INDICATE

2- BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_NOTIFY

3- BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_INDICATE

But unfortunately none of them worked.

Can some one help me in setting notifiable to YES on Mac OS X Central for Android Peripheral characteristic ?

Upvotes: 1

Views: 1242

Answers (1)

Thomas
Thomas

Reputation: 1

On android, you need set descriptor to enable notification. 

    BluetoothGattService gattService = new BluetoothGattService(YOUR_SERVICE_UUID,
            BluetoothGattService.SERVICE_TYPE_PRIMARY);

    BluetoothGattCharacteristic characteristic = new BluetoothGattCharacteristic(YOUR_CHARACTERISTIC_UUID,
            BluetoothGattCharacteristic.PROPERTY_WRITE | BluetoothGattCharacteristic.PROPERTY_INDICATE, BluetoothGattCharacteristic.PERMISSION_WRITE);
    BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(UUID.fromString("00002902-0000-1000-8000-00805F9B34FB"),
            BluetoothGattDescriptor.PERMISSION_READ | BluetoothGattDescriptor.PERMISSION_WRITE);
    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
    characteristic.addDescriptor(descriptor);

    gattService.addCharacteristic(characteristic);

Upvotes: 0

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