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> Being effective with BLE requires deep understanding of the entire stack, and since it is difficult for a single person to have such level of understanding, we get bugs.

Bluetooth or LE? LE with GATT in my experience deals with none of this. At least not on an Apple product, CoreBluetooth hides all of this from me as an iOS or macOS developer.

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Apple does hide most of this, but consider that an iPhone app isn't the BLE product most developers are building, rather it is the device that iPhone app talks to, and where the bugs lurk. (Not that Apple doesn't have its fare share of BLE bugs at the chipset/driver level, which resurface with every new iOS release.)

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