1. add APIs to set/get announce interval values. 2. add API to enable/disable the min rate to 6Mbps for data packages. 3. add APIs to set/get RSSI threshold values. 4. fix ap_loss.
1. rename example internal_transceiver to internal_communication 2. bugfix 3. Closes https://github.com/espressif/esp-idf/issues/2014