Found the issue with some help from github : https://github.com/espressif/esp-idf/issues/953 Seems that the crystal frequency (Component Config -> ESP32 Specific -> Main XTAL frequency) on the 2.1 branch is hardcoded to 40MHz. On the 2.1 tar bal it is set to auto-detect. The Sparkfun ESP32 Thing use...

In most bluetooth examples in esp-idf where I see a call to esp_ble_gap_start_advertising I would expect the advertisement to just work and have the device show up in a BLE scanning app like Nrf Connect. Same thing for the GATT server sample, the advertising call works, I don't see anything special ...

Thanks for the tip. However same result with the 2.1 release. No errors n the logs but it's not showing up in Nrf Connect. Should I see some "low level" bluetooth stack related stuff in the logs (like the hw address of the device) ? [0;32mI (31) boot: ESP-IDF v2.1-2-g7138fb0 2nd stage bootloader[0m ...

I'm trying to run the ble_adv sample from ESP-IDF and get my Sparkfun ESP32 Thing to show up on my Nordic NR Connect app on my iPhone but it doesn't show up in my list of beacons. I did manage to see my ESP32 when I was using the Adruino Simple BLE example, so the board / bluetooth stack / iPhone se...