Crash when initializing a weak connection

[peabody124]

When my device is just on the edge of range and ultimately probably won't establish a reliable connection I get this error stack from the Android-BLE-Library:

04-12 16:53:03.586 8991-9590/org.sralab.emgimu W/BluetoothGatt: Unhandled exception in callback
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.bluetooth.BluetoothDevice android.bluetooth.BluetoothGatt.getDevice()' on a null object reference
        at no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.onDeviceReady(BleManager.java:1276)
        at no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.nextRequest(BleManager.java:1734)
        at no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.nextRequest(BleManager.java:1834)
        at no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.nextRequest(BleManager.java:1834)
        at no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.onCharacteristicRead(BleManager.java:1550)
        at android.bluetooth.BluetoothGatt$1$6.run(BluetoothGatt.java:364)
        at android.bluetooth.BluetoothGatt.runOrQueueCallback(BluetoothGatt.java:725)
        at android.bluetooth.BluetoothGatt.-wrap0(Unknown Source:0)
        at android.bluetooth.BluetoothGatt$1.onCharacteristicRead(BluetoothGatt.java:358)
        at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:124)
        at android.os.Binder.execTransact(Binder.java:697)

In my case I get a link loss callback so I close the BleManager. This sets the GattCallback to null. It seems like when the BleManager is in this state, it should not attempt to go through the initialization requests.

[peabody124]

As an aside this is me probably using this slightly improperly. I realized that with autoConnect true I should let it fail to reconnect and then close out the connection. Still it probably should be safe for this behavior.

[peabody124]

Note my "workaround" a.k.a. using it correctly probably, is to call disconnect() before close(). This is even when onDeviceConnected / onDeviceReady never fired -- just onDeviceConnecting.