bluedroid host supports the maximum number of connections to 9

components/bt/host/bluedroid/Kconfig.in

@@ -993,12 +993,16 @@ menu "BT DEBUG LOG LEVEL"
 endmenu #BT DEBUG LOG LEVEL
 
 config BT_ACL_CONNECTIONS
-    int "BT/BLE MAX ACL CONNECTIONS(1~7)"
+    int "BT/BLE MAX ACL CONNECTIONS(1~9)"
     depends on BT_BLUEDROID_ENABLED
-    range 1 7
+    range 1 9
     default 4
     help
-        Maximum BT/BLE connection count
+        Maximum BT/BLE connection count. The ESP32-C3/S3 chip supports a maximum of 10 instances,
+        including ADV, SCAN and connections. The ESP32-C3/S3 chip can connect up to 9 devices if
+        ADV or SCAN uses only one. If ADV and SCAN are both used, The ESP32-C3/S3 chip is connected
+        to a maximum of 8 devices. Because Bluetooth cannot reclaim used instances once ADV or SCAN
+        is used.
 
 config BT_MULTI_CONNECTION_ENBALE
     bool "Enable BLE multi-conections"

components/bt/host/bluedroid/bta/dm/include/bta_dm_int.h

@@ -1153,7 +1153,7 @@ typedef union {
 } tBTA_DM_MSG;
 
 
-#define BTA_DM_NUM_PEER_DEVICE 7
+#define BTA_DM_NUM_PEER_DEVICE  MAX_ACL_CONNECTIONS
 
 #define BTA_DM_NOT_CONNECTED  0
 #define BTA_DM_CONNECTED      1

components/bt/host/bluedroid/bta/gatt/include/bta_gattc_int.h

@@ -317,7 +317,7 @@ typedef struct {
 } tBTA_GATTC_SERV;
 
 #ifndef BTA_GATTC_NOTIF_REG_MAX
-#define BTA_GATTC_NOTIF_REG_MAX     7//15
+#define BTA_GATTC_NOTIF_REG_MAX     BTA_GATTC_CONN_MAX
 #endif
 
 typedef struct {