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Bluetooth Low Energy: The Developer’s Handbook by Robin Heydon

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Chapter 6. Direct Test Mode

Knowledge must come through action; you can have no test which is not fanciful, save by trial.

—Sophocles

6.1. Background

One of the biggest problems with wireless systems, especially those that are designed for the lowest possible cost of production, is how to calibrate them and perform qualification and product line tests of their performance. This is especially true after the device has been packaged into another module or product, and there is no way to move aside the host stack to perform a few seconds of testing at the start of the device’s life. Direct Test Mode solves all these problems by defining standard testing procedures and a hardware interface to drive this protocol even after a host stack and other ...

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