Bluedroid Host Support for Dual Local Identities

Introduction

When a single peer phone connects to an ESP32 peripheral through two different local identities (for example, a Public address and a fixed Static Random address from two extended advertising sets), the default Bluedroid Host treats both links as the same peer. Bonds, LTK, and NVS sections can overwrite each other.

Enable BT_BLE_PERIPH_PSEUDO_ADDR_BOND to derive a Host-internal pseudo address f(local_identity, peer) per link. The application sees two different remote_bda values for the same phone, while SMP and the controller still use the real peer identity on air.

Example

See ble50_dual_identity_server for a Bluetooth LE 5.0 peripheral that advertises two identities concurrently, pairs with both, and keeps isolated bonds per (local, peer) pair.

Application Notes

Use conn_id as the link key in GATTS calls; do not use remote_bda to tell links apart.
remote_bda in GAP/GATTS events is the pseudo address when this feature is enabled.
Call esp_ble_gap_get_conn_identity() while connected to recover the real peer and local identity.
Use esp_ble_gap_remove_bond_for_identity() to delete one identity's bond without affecting the other.
For controller operations (whitelist, directed advertising), use the real peer address, never the pseudo.

Was this page helpful?

Thank you! We received your feedback.
If you have any comments, fill in Espressif Documentation Feedback Form.

We value your feedback.
Let us know how we can improve this page by filling in Espressif Documentation Feedback Form.