Android Question Wait For when reading BLE GATT descriptor

I am reading descriptors using the code from:

https://www.b4x.com/android/forum/t...characteristic-descriptor.102483/#post-643594

but waiting for the response from the BLE device using polling:

https://www.b4x.com/android/forum/t...characteristic-descriptor.102483/#post-643655

Is there a Wait For that I can use instead, that will wait for a callback from the gatt.RunMethod("readDescriptor" request?