We really want to use an ESP32 to build a CLASS1 (19dbm) Bluetooth modem. Problem is, there's no obvious way to switch an external amplifier or FEM from TX to RX. You can do it with WiFi using antenna switching https://docs.espressif.com/projects/esp-idf/en/v4.4-beta1/esp32s2/api-guides/wifi.html#wi...