zephyrproject-rtos · jhedberg · Oct 13, 2025 · Oct 10, 2025 · Oct 10, 2025 · Oct 10, 2025
diff --git a/doc/releases/release-notes-4.3.rst b/doc/releases/release-notes-4.3.rst
@@ -73,6 +73,10 @@ Deprecated APIs and options
 * :c:enum:`bt_hci_bus` was deprecated as it was not used. :c:macro:`BT_DT_HCI_BUS_GET` should be
   used instead.
 
+* :kconfig:option:`CONFIG_BT_AUTO_PHY_UPDATE` was deprecated and has been replaced with
+  role-specific (central vs peripheral) options that allow specifying exactly which PHY is
+  preferred for automatic updates.
+
 * :kconfig:option:`CONFIG_POSIX_READER_WRITER_LOCKS` is deprecated. Use :kconfig:option:`CONFIG_POSIX_RW_LOCKS` instead.
 
 * :c:func:`bt_ctlr_set_public_addr` is deprecated in favor of using
@@ -125,6 +129,14 @@ New APIs and options
     * :c:struct:`bt_iso_broadcaster_info` now contains a ``big_handle`` and a ``bis_number`` field
     * :c:struct:`bt_iso_sync_receiver_info` now contains a ``big_handle`` and a ``bis_number`` field
     * :c:struct:`bt_le_ext_adv_info` now contains an ``sid`` field with the Advertising Set ID.
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_PERIPHERAL_NONE`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_PERIPHERAL_1M`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_PERIPHERAL_2M`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_PERIPHERAL_CODED`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_CENTRAL_NONE`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_CENTRAL_1M`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_CENTRAL_2M`
+    * :kconfig:option:`CONFIG_BT_AUTO_PHY_CENTRAL_CODED`
 
 * CPUFreq
 

diff --git a/samples/bluetooth/central_hr/overlay-phy_coded.conf b/samples/bluetooth/central_hr/overlay-phy_coded.conf
@@ -4,7 +4,7 @@ CONFIG_BT_EXT_ADV=y
 CONFIG_BT_CTLR_PHY_CODED=y
 
 # Disable auto PHY update, to switch to 2M PHY
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 
 # Increase Scan Data Length, as Complete Local Name is placed in the
 # AUX_ADV_IND PDU compared to when it is placed in ADV_SCAN_IND PDU in the case

diff --git a/samples/bluetooth/central_hr/sample.yaml b/samples/bluetooth/central_hr/sample.yaml
@@ -59,6 +59,6 @@ tests:
       - nrf5340dk/nrf5340/cpuapp
     extra_args:
       - CONFIG_BT_EXT_ADV=y
-      - CONFIG_BT_AUTO_PHY_UPDATE=n
+      - CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
     tags: bluetooth
     sysbuild: true
diff --git a/samples/bluetooth/central_multilink/prj.conf b/samples/bluetooth/central_multilink/prj.conf
@@ -1,6 +1,6 @@
 CONFIG_BT=y
 CONFIG_BT_CENTRAL=y
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_PRIVACY=y
 
 CONFIG_BT_MAX_CONN=62

diff --git a/samples/bluetooth/channel_sounding/connected_cs/initiator/prj.conf b/samples/bluetooth/channel_sounding/connected_cs/initiator/prj.conf
@@ -2,7 +2,7 @@ CONFIG_BT=y
 CONFIG_BT_SMP=y
 CONFIG_BT_CENTRAL=y
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_GATT_CLIENT=y
 CONFIG_BT_GATT_DYNAMIC_DB=y
 CONFIG_BT_ATT_PREPARE_COUNT=3

diff --git a/samples/bluetooth/channel_sounding/connected_cs/reflector/prj.conf b/samples/bluetooth/channel_sounding/connected_cs/reflector/prj.conf
@@ -2,7 +2,6 @@ CONFIG_BT=y
 CONFIG_BT_SMP=y
 CONFIG_BT_PERIPHERAL=y
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
-CONFIG_BT_AUTO_PHY_UPDATE=n
 CONFIG_BT_GATT_CLIENT=y
 CONFIG_BT_CHANNEL_SOUNDING=y
 

diff --git a/samples/bluetooth/peripheral_hr/overlay-phy_coded.conf b/samples/bluetooth/peripheral_hr/overlay-phy_coded.conf
@@ -3,9 +3,6 @@ CONFIG_BT_EXT_ADV=y
 # Enable Coded PHY support
 CONFIG_BT_CTLR_PHY_CODED=y
 
-# Disable auto PHY update, to switch to 2M PHY
-CONFIG_BT_AUTO_PHY_UPDATE=n
-
 # Increase Advertising Data Length, as Complete Local Name too needs to be
 # placed in the AUX_ADV_IND PDU compared to when it is placed in ADV_SCAN_IND
 # PDU in the case of legacy advertising.

diff --git a/samples/bluetooth/peripheral_hr/sample.yaml b/samples/bluetooth/peripheral_hr/sample.yaml
@@ -98,7 +98,6 @@ tests:
       - nrf5340dk/nrf5340/cpuapp
     extra_args:
       - CONFIG_BT_EXT_ADV=y
-      - CONFIG_BT_AUTO_PHY_UPDATE=n
     tags: bluetooth
     sysbuild: true
   sample.bluetooth.peripheral_hr_rv32m1_vega_openisa_rv32m1_ri5cy:

diff --git a/samples/bluetooth/peripheral_identity/prj.conf b/samples/bluetooth/peripheral_identity/prj.conf
@@ -1,6 +1,5 @@
 CONFIG_BT=y
 CONFIG_BT_PERIPHERAL=y
-CONFIG_BT_AUTO_PHY_UPDATE=n
 CONFIG_BT_PRIVACY=y
 
 CONFIG_BT_DEVICE_NAME="Zephyr Peripheral"

diff --git a/subsys/bluetooth/common/hci_common_internal.h b/subsys/bluetooth/common/hci_common_internal.h
@@ -16,7 +16,9 @@
 
 /* Auto initiated additional HCI command buffers enqueued in the Host */
 #define BT_BUF_CMD_TX_REMOTE_VERSION       COND_CODE_1(CONFIG_BT_REMOTE_VERSION, (1), (0))
-#define BT_BUF_CMD_TX_AUTO_PHY_UPDATE      COND_CODE_1(CONFIG_BT_AUTO_PHY_UPDATE, (1), (0))
+#define BT_BUF_CMD_TX_AUTO_PHY_UPDATE      (IS_ENABLED(CONFIG_BT_PHY_UPDATE) && \
+					    (!IS_ENABLED(CONFIG_BT_AUTO_PHY_PERIPHERAL_NONE) || \
+					    !IS_ENABLED(CONFIG_BT_AUTO_PHY_CENTRAL_NONE)))
 #define BT_BUF_CMD_TX_AUTO_DATA_LEN_UPDATE COND_CODE_1(CONFIG_BT_AUTO_DATA_LEN_UPDATE, (1), (0))
 
 #else /* CONFIG_BT_HCI_RAW */

diff --git a/subsys/bluetooth/host/Kconfig b/subsys/bluetooth/host/Kconfig
@@ -384,25 +384,68 @@ config BT_CONN_CHECK_NULL_BEFORE_CREATE
 	  dereferencing, the connection object stays alive which can lead to an
 	  unpredictable behavior.
 
+if BT_PHY_UPDATE
+
 config BT_USER_PHY_UPDATE
 	bool "User control of PHY Update Procedure"
-	depends on BT_PHY_UPDATE
 	help
 	  Enable application access to initiate the PHY Update Procedure.
 	  The application can also register a callback to be notified about PHY
 	  changes on the connection. The current PHY info is available in the
 	  connection info.
 
 config BT_AUTO_PHY_UPDATE
-	bool "Auto-initiate PHY Update Procedure"
-	depends on BT_PHY_UPDATE
-	default y if !BT_USER_PHY_UPDATE
+	bool "Auto-initiate PHY Update Procedure [DEPRECATED]"
+	select DEPRECATED
 	help
-	  Initiate PHY Update Procedure on connection establishment.
+	  Initiate PHY Update Procedure on connection establishment. This will attempt
+	  to update the connection to use 2M PHY, however it doesn't actually guarantee
+	  that this is what will be used in the end.
+
+	  This option has been deprecated in favor of role specific options. The equivalent
+	  behavior can be accomplished by enabling BT_AUTO_PHY_PERIPHERAL_2M and
+	  BT_AUTO_PHY_CENTRAL_2M.
+
+choice
+	prompt "Auto PHY update for peripheral role"
+	depends on BT_PERIPHERAL
+	default BT_AUTO_PHY_PERIPHERAL_2M if BT_AUTO_PHY_UPDATE
+	default BT_AUTO_PHY_PERIPHERAL_NONE
+
+config BT_AUTO_PHY_PERIPHERAL_NONE
+	bool "No PHY preference"
+
+config BT_AUTO_PHY_PERIPHERAL_1M
+	bool "1M PHY"
+
+config BT_AUTO_PHY_PERIPHERAL_2M
+	bool "2M PHY"
+
+config BT_AUTO_PHY_PERIPHERAL_CODED
+	bool "Coded PHY"
+
+endchoice # BT_AUTO_PHY_PERIPHERAL
+
+choice
+	prompt "Auto PHY update for central role"
+	depends on BT_CENTRAL
+	default BT_AUTO_PHY_CENTRAL_2M
+
+config BT_AUTO_PHY_CENTRAL_NONE
+	bool "No PHY preference"
+
+config BT_AUTO_PHY_CENTRAL_1M
+	bool "1M PHY"
+
+config BT_AUTO_PHY_CENTRAL_2M
+	bool "2M PHY"
+
+config BT_AUTO_PHY_CENTRAL_CODED
+	bool "Coded PHY"
+
+endchoice # BT_AUTO_PHY_CENTRAL
 
-	  Disable this if you want the PHY Update Procedure feature supported
-	  but want to rely on the remote device to initiate the procedure at its
-	  discretion or want to initiate manually.
+endif # BT_PHY_UPDATE
 
 config BT_USER_DATA_LEN_UPDATE
 	bool "User control of Data Length Update Procedure"

diff --git a/subsys/bluetooth/host/conn.c b/subsys/bluetooth/host/conn.c
@@ -1681,26 +1681,85 @@ int bt_conn_disconnect(struct bt_conn *conn, uint8_t reason)
 /* Group Connected BT_CONN only in this */
 #if defined(CONFIG_BT_CONN)
 
-/* We don't want the application to get a PHY update callback upon connection
- * establishment on 2M PHY. Therefore we must prevent issuing LE Set PHY
- * in this scenario.
- *
- * It is ifdef'd because the struct fields don't exist in some configs.
- */
-static bool uses_symmetric_2mbit_phy(struct bt_conn *conn)
+#if defined(CONFIG_BT_AUTO_PHY_PERIPHERAL_1M)
+#define AUTO_PHY_PERIPHERAL                  BT_HCI_LE_PHY_1M
+#define AUTO_PHY_PERIPHERAL_PREF             BT_HCI_LE_PHY_PREFER_1M
+#define AUTO_PHY_PERIPHERAL_SUPPORTED(_feat) (true)
+#elif defined(CONFIG_BT_AUTO_PHY_PERIPHERAL_2M)
+#define AUTO_PHY_PERIPHERAL                  BT_HCI_LE_PHY_2M
+#define AUTO_PHY_PERIPHERAL_PREF             BT_HCI_LE_PHY_PREFER_2M
+#define AUTO_PHY_PERIPHERAL_SUPPORTED(feat)  BT_FEAT_LE_PHY_2M(feat)
+#elif defined(CONFIG_BT_AUTO_PHY_PERIPHERAL_CODED)
+#define AUTO_PHY_PERIPHERAL                  BT_HCI_LE_PHY_CODED
+#define AUTO_PHY_PERIPHERAL_PREF             BT_HCI_LE_PHY_PREFER_CODED
+#define AUTO_PHY_PERIPHERAL_SUPPORTED(feat)  BT_FEAT_LE_PHY_CODED(feat)
+#else
+/* Dummy values when there's no preference */
+#define AUTO_PHY_PERIPHERAL                  (0)
+#define AUTO_PHY_PERIPHERAL_PREF             (0)
+#define AUTO_PHY_PERIPHERAL_SUPPORTED(_feat) (false)
+#endif
+
+#if defined(CONFIG_BT_AUTO_PHY_CENTRAL_1M)
+#define AUTO_PHY_CENTRAL                  BT_HCI_LE_PHY_1M
+#define AUTO_PHY_CENTRAL_PREF             BT_HCI_LE_PHY_PREFER_1M
+#define AUTO_PHY_CENTRAL_SUPPORTED(_feat) (true)
+#elif defined(CONFIG_BT_AUTO_PHY_CENTRAL_2M)
+#define AUTO_PHY_CENTRAL                  BT_HCI_LE_PHY_2M
+#define AUTO_PHY_CENTRAL_PREF             BT_HCI_LE_PHY_PREFER_2M
+#define AUTO_PHY_CENTRAL_SUPPORTED(feat)  BT_FEAT_LE_PHY_2M(feat)
+#elif defined(CONFIG_BT_AUTO_PHY_CENTRAL_CODED)
+#define AUTO_PHY_CENTRAL                  BT_HCI_LE_PHY_CODED
+#define AUTO_PHY_CENTRAL_PREF             BT_HCI_LE_PHY_PREFER_CODED
+#define AUTO_PHY_CENTRAL_SUPPORTED(feat)  BT_FEAT_LE_PHY_CODED(feat)
+#else
+/* Dummy values when there's no preference */
+#define AUTO_PHY_CENTRAL                  (0)
+#define AUTO_PHY_CENTRAL_PREF             (0)
+#define AUTO_PHY_CENTRAL_SUPPORTED(_feat) (false)
+#endif
+
+static int do_phy_update(struct bt_conn *conn)
 {
+	uint8_t phy, pref;
+	bool supported;
+
+	switch (conn->role) {
+#if !defined(CONFIG_BT_AUTO_PHY_CENTRAL_NONE)
+	case BT_HCI_ROLE_CENTRAL:
+		phy = AUTO_PHY_CENTRAL;
+		pref = AUTO_PHY_CENTRAL_PREF;
+		supported = AUTO_PHY_CENTRAL_SUPPORTED(bt_dev.le.features);
+		break;
+#endif
+#if !defined(CONFIG_BT_AUTO_PHY_PERIPHERAL_NONE)
+	case BT_HCI_ROLE_PERIPHERAL:
+		phy = AUTO_PHY_PERIPHERAL;
+		pref = AUTO_PHY_PERIPHERAL_PREF;
+		supported = AUTO_PHY_PERIPHERAL_SUPPORTED(bt_dev.le.features);
+		break;
+#endif
+	default:
+		return 0;
+	}
+
+	if (!supported) {
+		LOG_WRN("PHY 0x%02x not supported", phy);
+		return 0;
+	}
+
 #if defined(CONFIG_BT_USER_PHY_UPDATE)
 	if (IS_ENABLED(CONFIG_BT_EXT_ADV)) {
-		if (conn->le.phy.tx_phy == BT_HCI_LE_PHY_2M &&
-		    conn->le.phy.rx_phy == BT_HCI_LE_PHY_2M) {
-			return true;
+		/* If the current PHYs are already the preferred PHYs, no need to issue
+		 * a PHY update procedure.
+		 */
+		if (conn->le.phy.tx_phy == phy && conn->le.phy.rx_phy == phy) {
+			return 0;
 		}
 	}
-#else
-	ARG_UNUSED(conn);
 #endif
 
-	return false;
+	return bt_le_set_phy(conn, 0U, pref, pref, BT_HCI_LE_PHY_CODED_ANY);
 }
 
 static bool can_initiate_feature_exchange(struct bt_conn *conn)
@@ -1767,13 +1826,14 @@ static void perform_auto_initiated_procedures(struct bt_conn *conn, void *unused
 		}
 	}
 
-	if (IS_ENABLED(CONFIG_BT_AUTO_PHY_UPDATE) && BT_FEAT_LE_PHY_2M(bt_dev.le.features) &&
-	    !uses_symmetric_2mbit_phy(conn)) {
-		err = bt_le_set_phy(conn, 0U, BT_HCI_LE_PHY_PREFER_2M, BT_HCI_LE_PHY_PREFER_2M,
-				    BT_HCI_LE_PHY_CODED_ANY);
+	if (IS_ENABLED(CONFIG_BT_PHY_UPDATE) &&
+	    (!IS_ENABLED(CONFIG_BT_AUTO_PHY_CENTRAL_NONE) ||
+	     !IS_ENABLED(CONFIG_BT_AUTO_PHY_PERIPHERAL_NONE))) {
+		err = do_phy_update(conn);
 		if (err) {
 			LOG_ERR("Failed LE Set PHY (%d)", err);
 		}
+
 		if (conn->state != BT_CONN_CONNECTED) {
 			return;
 		}

diff --git a/tests/bluetooth/shell/audio.conf b/tests/bluetooth/shell/audio.conf
@@ -50,7 +50,6 @@ CONFIG_BT_USER_DATA_LEN_UPDATE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=y
 
 CONFIG_BT_USER_PHY_UPDATE=y
-CONFIG_BT_AUTO_PHY_UPDATE=y
 
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
 # Set preferred values based on BT_BAP_CONN_PARAM_RELAXED

diff --git a/tests/bluetooth/shell/log.conf b/tests/bluetooth/shell/log.conf
@@ -47,7 +47,6 @@ CONFIG_BT_USER_DATA_LEN_UPDATE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=y
 
 CONFIG_BT_USER_PHY_UPDATE=y
-CONFIG_BT_AUTO_PHY_UPDATE=y
 
 CONFIG_BT_ISO_BROADCASTER=y
 CONFIG_BT_ISO_SYNC_RECEIVER=y

diff --git a/tests/bluetooth/shell/prj.conf b/tests/bluetooth/shell/prj.conf
@@ -47,7 +47,6 @@ CONFIG_BT_AUTO_DATA_LEN_UPDATE=y
 CONFIG_BT_EAD=y
 
 CONFIG_BT_USER_PHY_UPDATE=y
-CONFIG_BT_AUTO_PHY_UPDATE=y
 
 CONFIG_BT_ISO_BROADCASTER=y
 CONFIG_BT_ISO_SYNC_RECEIVER=y

diff --git a/tests/bsim/bluetooth/host/att/pipeline/dut/prj.conf b/tests/bsim/bluetooth/host/att/pipeline/dut/prj.conf
@@ -36,7 +36,7 @@ CONFIG_BT_USER_DATA_LEN_UPDATE=y
 
 # Disable auto-initiated procedures so they don't
 # mess with the test's execution.
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
 

diff --git a/tests/bsim/bluetooth/host/att/sequential/dut/prj.conf b/tests/bsim/bluetooth/host/att/sequential/dut/prj.conf
@@ -34,7 +34,7 @@ CONFIG_BT_USER_DATA_LEN_UPDATE=y
 
 # Disable auto-initiated procedures so they don't
 # mess with the test's execution.
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
 

diff --git a/tests/bsim/bluetooth/host/gatt/device_name/prj.conf b/tests/bsim/bluetooth/host/gatt/device_name/prj.conf
@@ -10,7 +10,7 @@ CONFIG_BT_DEVICE_NAME_GATT_WRITABLE=y
 # Dependency of testlib/adv and testlib/scan.
 CONFIG_BT_EXT_ADV=y
 
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_GATT_AUTO_UPDATE_MTU=n
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n

diff --git a/tests/bsim/bluetooth/host/gatt/notify_stress/prj.conf b/tests/bsim/bluetooth/host/gatt/notify_stress/prj.conf
@@ -11,7 +11,7 @@ CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y
 CONFIG_BT_L2CAP_ECRED=y
 CONFIG_BT_EATT=y
 
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 
 CONFIG_ASSERT=y

diff --git a/tests/bsim/bluetooth/host/gatt/settings/prj.conf b/tests/bsim/bluetooth/host/gatt/settings/prj.conf
@@ -7,7 +7,7 @@ CONFIG_LOG=y
 CONFIG_ASSERT=y
 CONFIG_BT_TESTING=y
 
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
 

diff --git a/tests/bsim/bluetooth/host/gatt/settings_clear/prj.conf b/tests/bsim/bluetooth/host/gatt/settings_clear/prj.conf
@@ -8,7 +8,7 @@ CONFIG_BT_DEVICE_NAME="GATT settings clear"
 # Dependency of testlib/adv and testlib/scan.
 CONFIG_BT_EXT_ADV=y
 
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
 

diff --git a/tests/bsim/bluetooth/host/l2cap/credits/prj.conf b/tests/bsim/bluetooth/host/l2cap/credits/prj.conf
@@ -11,7 +11,7 @@ CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y
 
 # Disable auto-initiated procedures so they don't
 # mess with the test's execution.
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
 

diff --git a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/prj.conf b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/prj.conf
@@ -11,7 +11,7 @@ CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y
 
 # Disable auto-initiated procedures so they don't
 # mess with the test's execution.
-CONFIG_BT_AUTO_PHY_UPDATE=n
+CONFIG_BT_AUTO_PHY_CENTRAL_NONE=y
 CONFIG_BT_AUTO_DATA_LEN_UPDATE=n
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n