bluetooth lowenergy - Service returned by GetGattServicesForUuidAsync doesn't help enumerate characteristics

Question

Instead of searching for the service of interest, I tried the following

auto f = leDev.GetGattServicesForUuidAsync(servUuid).get(); // returns a GattDeviceServicesResult
auto g = f.Services().GetAt(0); // There is only one such service on the device that I am using
auto h = g.GetCharacteristicsAsync().get(); // Use the service to obtain all the characteristics of the service
auto j = h.Characteristics(); // Size of j is 0 despite there are 4 services

The way I constructed servUuid is to use the string that had the service UUID

guid servGUIDstruct = make_guid(servID);
winrt::guid servUuid = reinterpret_cast<winrt::guid&>(servGUIDstruct);

I also tried other ways to obtain a service Uuid, for e.g., enumerating all services and storing the Uuid of the service of interest and then using it in GetGattServicesForUuidAsync but to see the same issue.

It would be very useful to know what is that I am not doing right, Thanks

Answer 1

The problem as I understand is that since I have already enumerated all the services and characteristics therein, I have to call Close on the services before obtaining a service again. Here's the link that explains possibly why the access has been denied.