Do you have an application code in the CYW20706 or you just run the device in HCI mode?
What's the hci command "01 27 FC ..." for?
Customer just run the device with HCI mode in linux.
0xFC27 is "Set_Sleepmode_Param" hci command
Could you get the right response when you send the set_sleepmode_param command?
Did you pull the wake up pin to low to enable the device to sleep?