Hi G,
I’m afraid we (Silicon Labs) don’t support mbed OS’ BLE stack on Thunderboard Sense 2. The wireless protocol support for Thunderboard Sense 2 on mbed OS is currently limited to 802.15.4 through Nanostack, i.e. 6LoWPAN and Thread.
We’re hoping to have a BLE solution on mbed OS using our parts at some point in the future, but I sadly don’t have any indication if/when this might happen. But I’d say to not hold your breath. If you want BLE on TB Sense 2, I recommend checking out our BLE examples in Simplicity Studio.
-Steven
Silicon Labs