CRC check for over the air transmitted packets and re-transmission as required is done BLE Link Layer firmware as per BLE specifications.

Error pint "lld_pdu_get_tx_flush_nb HCI packet count mismatch (1, 2)" is logged at the time abrupt disconnection if all the ACL packets are not flushed correctly. Fix for correctly flushing the ACL packets during abrupt disconnection is under review; will update here once merged. But, the reason for...

Hello, In ESP-IDF bluedroid stack code, I do not see any limitation on the "Playback interval" parameter. Also, in AVRCP spec, there is no lower limit mentioned on this parameter. It will be helpful to debug the issue if you provide the following info: 1. What is the remote device (A2DP source) used...

Hello, bluetooth/bluedroid/classic_bt/a2dp_sink example in ESP-IDF, which simulates the volume change and sends notification to the remote device, works fine with most of the mobile handsets. If you haven't already, please take a look at this example and make sure you are following all the steps cor...

"Passkey entry" pairing option can be used to enforce SSP (Secure Simple Pairing) instead of Legacy pairing.
Please check following API to reply the passkey value: Thanks.

As per spec Bluetooth, BLE passkey needs to be 6 digits long when using LE passkey entry pairing procedure. You might be getting it confused with 4 digit PIN used in case of Bluetooth Classic pairing procedure. Android devices are behaving correctly by rejecting the 4-digit key. 0's appended at the ...

Please see if following information is useful: Bluetooth specification info: 1. AVRCP profile is used to exchange control information in Bluetooth A/V distribution scenarios. 2. AVRCP CT (controller) device sends commands and registers notifications to get info about events like change in volume, tr...

Hi Elivander, ESP32-IDF supports Nimble Host stack only. You can use ble_hs_hci_read_chan_map(...) API from the NIBLE host (please check components/bt/host/nimble/nimble/nimble/host/include/host/ble_hs_hci.h for more info) and it should work with ESP32-IDF BLE controller code. Let us know if you fac...