In the Direct Test Mode app, you can control the reception and transmission characteristics of the Bluetooth® connection through 2-wire UART, in accordance with the Bluetooth Core specification, volume 6, part F.
It is recommended to use two devices for both scenarios:
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Device 1: One device programmed with firmware compatible with Direct Test Mode. See Supported device for more information.
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Device 2: One device programmed with the firmware conformant to the Bluetooth specification. This can also be an off-the-shelf product certified for Bluetooth Core 5.3.