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CC2541: PER Testing using HCI vender command

Part Number: CC2541
Other Parts Discussed in Thread: CC2640

I'm trying to get the PER value for the EU testing requirement and would like to implement a software output as well. I'm trying to use HCI_EXT_PacketErrorRateCmd function but I am not getting any events back after calling it. I'm using version 1.4.0 of the library stack and updating right now is a bit of a overhaul. I've looked at the TI_BLE_Vendor_Specific_HCI_Guide.pdf but still have no luck of getting the function to work.

Are there some sort of initialization I need to do?

Are there other ways to get the PER values?