Informed by the discussion in the bug and the code in 'that other branch' the fix was clear. Just set a flag if we start handling a write, and use that flag to guard the long write complete call.
* add timed wait * Added Notification/Indication data and status callbacks * imply null-object pattern for BLE callback
* Set IDF to v3.2 * Remove BLE submodule * Add BLE lib source * Update Camera example to support OV3660
