Bluetooth: controller: Refactor Conn Param Req implementation

Refactor the Connection Parameter Request Procedure to be
separate from and not overlap the variables of the
Connection Update Procedure.

Also, added missing implementations to pass all Connection
Parameter Request Procedure related Conformance Tests.

Jira: ZEP-1918

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

subsys/bluetooth/controller/Kconfig

@@ -112,6 +112,13 @@ config BT_CTLR_LE_ENC
 	# Enable support for Bluetooth v4.0 LE Encryption feature in the
 	# Controller.
 
+config BT_CTLR_CONN_PARAM_REQ
+	bool "Connection Parameter Request"
+	default y
+	help
+	  Enable support for Bluetooth v4.1 Connection Parameter Request feature
+	  in the Controller.
+
 config BT_CTLR_LE_PING
 	bool "LE Ping"
 	default y

subsys/bluetooth/controller/hci/hci.c

@@ -2431,6 +2431,10 @@ static void le_conn_param_req(struct pdu_data *pdu_data, u16_t handle,
 
 	if (!(event_mask & BT_EVT_MASK_LE_META_EVENT) ||
 	    !(le_event_mask & BT_EVT_MASK_LE_CONN_PARAM_REQ)) {
+		/* event masked, reject the conn param req */
+		ll_conn_update(handle, 2, BT_HCI_ERR_UNSUPP_REMOTE_FEATURE,
+			       0, 0, 0);
+
 		return;
 	}