extmod/bluetooth: Expose function to compare_database_hashes.

Will compare current connection db_hash against stored hash in bond db,
send service_changed indication if changed and return comparison result.

Author: Marceau Fillon

extmod/modbluetooth.c

@@ -724,6 +724,15 @@ static mp_obj_t bluetooth_ble_gap_passkey(size_t n_args, const mp_obj_t *args) {
     return bluetooth_handle_errno(mp_bluetooth_gap_passkey(conn_handle, action, passkey));
 }
 static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(bluetooth_ble_gap_passkey_obj, 4, 4, bluetooth_ble_gap_passkey);
+
+static mp_obj_t bluetooth_compare_database_hashes(mp_obj_t self_in, mp_obj_t conn_handle_in) {
+    (void)self_in;
+    int result = 0;
+    uint16_t conn_handle = mp_obj_get_int(conn_handle_in);
+    result = mp_bluetooth_compare_database_hashes(conn_handle);
+    return MP_OBJ_NEW_SMALL_INT(result);
+}
+static MP_DEFINE_CONST_FUN_OBJ_2(bluetooth_compare_database_hashes_obj, bluetooth_compare_database_hashes);
 #endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
 
 // ----------------------------------------------------------------------------
@@ -946,6 +955,7 @@ static const mp_rom_map_elem_t bluetooth_ble_locals_dict_table[] = {
     #if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
     { MP_ROM_QSTR(MP_QSTR_gap_pair), MP_ROM_PTR(&bluetooth_ble_gap_pair_obj) },
     { MP_ROM_QSTR(MP_QSTR_gap_passkey), MP_ROM_PTR(&bluetooth_ble_gap_passkey_obj) },
+    { MP_ROM_QSTR(MP_QSTR_gap_compare_database_hashes), MP_ROM_PTR(&bluetooth_compare_database_hashes_obj) },
     #endif
     // GATT Server
     { MP_ROM_QSTR(MP_QSTR_gatts_register_services), MP_ROM_PTR(&bluetooth_ble_gatts_register_services_obj) },

extmod/modbluetooth.h

@@ -360,6 +360,9 @@ int mp_bluetooth_gap_pair(uint16_t conn_handle);
 
 // Respond to a pairing request.
 int mp_bluetooth_gap_passkey(uint16_t conn_handle, uint8_t action, mp_int_t passkey);
+
+// Compare stored database hash to current one
+int mp_bluetooth_compare_database_hashes(uint16_t conn_handle);
 #endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
 
 #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE

extmod/nimble/modbluetooth_nimble.c

@@ -1137,6 +1137,23 @@ int mp_bluetooth_gap_passkey(uint16_t conn_handle, uint8_t action, mp_int_t pass
     DEBUG_printf("mp_bluetooth_gap_passkey: injecting IO: conn_handle=%d, action=%d, passkey=" UINT_FMT ", numcmp_accept=%d\n", conn_handle, io.action, (mp_uint_t)io.passkey, io.numcmp_accept);
     return ble_hs_err_to_errno(ble_sm_inject_io(conn_handle, &io));
 }
+
+int mp_bluetooth_compare_database_hashes(uint16_t conn_handle) {
+    DEBUG_printf("mp_bluetooth_compare_database_hashes: conn_handle=%d\n", conn_handle);
+    struct ble_store_value_hash hash_value;
+    struct ble_store_key_hash hash_key;
+    struct ble_hs_conn *conn;
+
+    conn = ble_hs_conn_find(conn_handle);
+    BLE_HS_DBG_ASSERT(conn != NULL);
+
+    hash_key.peer_addr = conn->bhc_peer_addr;
+    hash_key.peer_addr.type =
+        ble_hs_misc_peer_addr_type_to_id(conn->bhc_peer_addr.type);
+    hash_key.idx = 0;
+
+    return ble_store_read_hash(conn_handle, &hash_key, &hash_value);
+}
 #endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
 
 #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE