[esp32_ble] Make BLE notification limit configurable to fix ESP_GATT_NO_RESOURCES errors

esphome/components/esp32_ble/__init__.py

@@ -118,6 +118,7 @@ CONF_IO_CAPABILITY = "io_capability"
 CONF_ADVERTISING_CYCLE_TIME = "advertising_cycle_time"
 CONF_DISABLE_BT_LOGS = "disable_bt_logs"
 CONF_CONNECTION_TIMEOUT = "connection_timeout"
+CONF_MAX_NOTIFICATIONS = "max_notifications"
 
 NO_BLUETOOTH_VARIANTS = [const.VARIANT_ESP32S2]
 
@@ -173,6 +174,11 @@ CONFIG_SCHEMA = cv.Schema(
             cv.positive_time_period_seconds,
             cv.Range(min=TimePeriod(seconds=10), max=TimePeriod(seconds=180)),
         ),
+        cv.SplitDefault(CONF_MAX_NOTIFICATIONS, esp32_idf=12): cv.All(
+            cv.only_with_esp_idf,
+            cv.positive_int,
+            cv.Range(min=1, max=64),
+        ),
     }
 ).extend(cv.COMPONENT_SCHEMA)
 
@@ -272,6 +278,15 @@ async def to_code(config):
                 "CONFIG_BT_BLE_ESTAB_LINK_CONN_TOUT", timeout_seconds
             )
 
+        # Set the maximum number of notification registrations
+        # This controls how many BLE characteristics can have notifications enabled
+        # across all connections for a single GATT client interface
+        # https://github.com/esphome/issues/issues/6808
+        if CONF_MAX_NOTIFICATIONS in config:
+            add_idf_sdkconfig_option(
+                "CONFIG_BT_GATTC_NOTIF_REG_MAX", config[CONF_MAX_NOTIFICATIONS]
+            )
+
     cg.add_define("USE_ESP32_BLE")
 
 

esphome/components/esp32_ble_tracker/__init__.py

@@ -355,11 +355,6 @@ async def to_code(config):
         add_idf_sdkconfig_option(
             "CONFIG_BTDM_CTRL_BLE_MAX_CONN", config[CONF_MAX_CONNECTIONS]
         )
-        # CONFIG_BT_GATTC_NOTIF_REG_MAX controls the number of
-        # max notifications in 5.x, setting CONFIG_BT_ACL_CONNECTIONS
-        # is enough in 4.x
-        # https://github.com/esphome/issues/issues/6808
-        add_idf_sdkconfig_option("CONFIG_BT_GATTC_NOTIF_REG_MAX", 9)
 
     cg.add_define("USE_OTA_STATE_CALLBACK")  # To be notified when an OTA update starts
     cg.add_define("USE_ESP32_BLE_CLIENT")