nRF52 Bluetooth Certification, Hopping mode

[Nano]

I'm in a situation similar to the one described in this question:

devzone.nordicsemi.com/.../

The company performing the test ask me to provide a device that can switch in between the lowest, middle and highest frequency (channels) and a 4th mode that do the hopping among all the channels.

Taking a look at the DTM example the first 3 modes look easy to implement, but I have no clue about how to start this hopping mode. Knowing that is the standard for Bluetooth I'm sure is something so evident I'm not even seeing it, but I'd gladly accept some help.

[FormerMember]

The testing you refer to, is it a regulatory compliance test (FCC,ETSI, etc.)? If so, I would recommend you to use the radio test example in the SDK, and modify to what you need. With the radio test example you can easily control the radio from a terminal using UART.

[FormerMember]

I haven't heard about the need for a frequency hopping test firmware like that before. Is this for FCC/ETSI or for Bluetooth qualification?

Note: In FCC, a BLE device should not be qualified as a frequency hopping device. While it does hop in frequency in connected mode, it doesn't do it in advertising mode. So it will fail the hopping requirements. Instead, qualify it as a "Digital Transmission System" under FCC 15.247