diff --git a/README.md b/README.md
index e685a0ff..b00ff089 100644
--- a/README.md
+++ b/README.md
@@ -108,7 +108,7 @@ Each object in the **DMOBJ** table contains the following arguments:
 | `permission`        | The permission of the object. Could be **&DMREAD** or **&DMWRITE**. If it's `&DMWRITE` then we can add/delete instances of this object |
 | `addobj`            | The function to add new instance under this object. This function will be triggered when the ACS/Controller call AddObject of this object |
 | `delobj`            | The function to delete instance under this object. This function will be triggered when the ACS/Controller call DeleteObject of an instance of this object |
-| `checkobj`          | The function to check if the object is allowed to appear in the tree. If it's `NULL` then the object has always appeared in the tree |
+| `checkdep`          | A string of the object dependency, it can be a file("file:/etc/config/network") or an ubus object,method("ubus:network.interface->status"). If it's `NULL` then the object has always appeared in the tree. |
 | `browseinstobj`     | This function allow to browse all instances under this object |
 | `forced_inform`     | If it's set to `&DMFINFRM` that mean the object contains a force inform parameter in its subtree. The forced inform parameters are the parameter included in the inform message |
 | `notification`      | The notification of the object. Could be **&DMACTIVE**, **&DMACTIVE** or **&DMNONE** |
diff --git a/dmentryjson.c b/dmentryjson.c
index c94c718d..142a41e8 100644
--- a/dmentryjson.c
+++ b/dmentryjson.c
@@ -743,7 +743,7 @@ static void count_obj_param_under_jsonobj(json_object *jsonobj, int *obj_number,
 
 static void parse_obj(char *object, json_object *jobj, DMOBJ *pobj, int index, struct list_head *list)
 {
-	/* OBJ, permission, addobj, delobj, checkobj, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type(13)*/
+	/* OBJ, permission, addobj, delobj, checkdep, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type(13)*/
 
 	char *full_obj = NULL, *prfix_obj = NULL, *obj_str = NULL;
 	int obj_number = 0, param_number = 0, i = 0, j = 0;
@@ -802,8 +802,8 @@ static void parse_obj(char *object, json_object *jobj, DMOBJ *pobj, int index, s
 			//delobj
 			pobj[index].delobj = json_object_get_boolean(json_obj) ? delete_obj : NULL;
 
-			//checkobj
-			pobj[index].checkobj = NULL;
+			//checkdep
+			pobj[index].checkdep = NULL;
 
 			//browseinstobj
 			pobj[index].browseinstobj = json_object_get_boolean(json_obj) ? browse_obj : NULL;
diff --git a/dmtree/tr181/device.c b/dmtree/tr181/device.c
index f040ba74..cc0fbb58 100644
--- a/dmtree/tr181/device.c
+++ b/dmtree/tr181/device.c
@@ -57,7 +57,7 @@
 
 /* *** BBFDM *** */
 DMOBJ tEntry181Obj[] = {
-/* OBJ, permission, addobj, delobj, checkobj, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type*/
+/* OBJ, permission, addobj, delobj, checkdep, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type*/
 {"Device", &DMREAD, NULL, NULL, NULL, NULL, &DMFINFRM, &DMNONE, NULL, tRoot_181_Obj, tRoot_181_Params, NULL, BBFDM_BOTH},
 {0}
 };
@@ -70,47 +70,51 @@ DMLEAF tRoot_181_Params[] = {
 };
 
 DMOBJ tRoot_181_Obj[] = {
-/* OBJ, permission, addobj, delobj, checkobj, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type*/
+/* OBJ, permission, addobj, delobj, checkdep, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type*/
 {"DeviceInfo", &DMREAD, NULL, NULL, NULL, NULL, &DMFINFRM, &DMNONE, NULL, tDeviceInfoObj, tDeviceInfoParams, NULL, BBFDM_BOTH},
-{"ManagementServer", &DMREAD, NULL, NULL, NULL, NULL, &DMFINFRM, &DMNONE, NULL, NULL, tManagementServerParams, NULL, BBFDM_BOTH},
-{"Time", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, NULL, tTimeParams, NULL, BBFDM_BOTH},
-{"UPnP", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, tUPnPObj, NULL, NULL, BBFDM_BOTH},
+{"ManagementServer", &DMREAD, NULL, NULL, "file:/etc/config/cwmp", NULL, &DMFINFRM, &DMNONE, NULL, NULL, tManagementServerParams, NULL, BBFDM_BOTH},
+{"Time", &DMREAD, NULL, NULL, "file:/etc/config/system", NULL, NULL, &DMNONE, NULL, NULL, tTimeParams, NULL, BBFDM_BOTH},
+{"UPnP", &DMREAD, NULL, NULL, "file:/etc/config/upnpd", NULL, NULL, &DMNONE, NULL, tUPnPObj, NULL, NULL, BBFDM_BOTH},
 #ifdef BBF_TR104
 {"Services", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, tServicesObj, NULL, NULL, BBFDM_BOTH},
 #endif
-{CUSTOM_PREFIX"Syslog", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, NULL, tSe_SyslogParam, NULL, BBFDM_BOTH},
-{CUSTOM_PREFIX"OWSD", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, X_IOPSYS_EU_OWSDObj, X_IOPSYS_EU_OWSDParams, NULL, BBFDM_BOTH},
-{CUSTOM_PREFIX"IGMP", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, X_IOPSYS_EU_IGMPObj, X_IOPSYS_EU_IGMPParams, NULL, BBFDM_BOTH},
-{CUSTOM_PREFIX"MLD", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, X_IOPSYS_EU_MLDObj, X_IOPSYS_EU_MLDParams, NULL, BBFDM_BOTH},
-{CUSTOM_PREFIX"Dropbear", &DMWRITE, add_dropbear_instance, delete_dropbear_instance, NULL, browseXIopsysEuDropbear, NULL, &DMNONE, NULL, NULL, X_IOPSYS_EU_DropbearParams, NULL, BBFDM_BOTH},
-{CUSTOM_PREFIX"Buttons", &DMREAD, NULL, NULL, NULL, browseXIopsysEuButton, NULL, &DMNONE, NULL, NULL, X_IOPSYS_EU_ButtonParams, NULL, BBFDM_BOTH},
-{"Bridging",&DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tBridgingObj, tBridgingParams, NULL, BBFDM_BOTH},
-{"WiFi",&DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tWiFiObj, tWiFiParams, NULL, BBFDM_BOTH},
-{"IP",&DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tIPObj, tIPParams, NULL, BBFDM_BOTH},
-{"Ethernet", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tEthernetObj, tEthernetParams, NULL, BBFDM_BOTH},
-{"DSL",&DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tDSLObj, tDSLParams, NULL, BBFDM_BOTH},
-{"ATM",&DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tATMObj, NULL, NULL, BBFDM_BOTH},
-{"PTM", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tPTMObj, NULL, NULL, BBFDM_BOTH},
-{"DHCPv4", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tDHCPv4Obj, tDHCPv4Params, NULL, BBFDM_BOTH},
-{"DHCPv6", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tDHCPv6Obj, tDHCPv6Params, NULL, BBFDM_BOTH},
+{CUSTOM_PREFIX"Syslog", &DMREAD, NULL, NULL, "file:/etc/config/system", NULL, NULL, &DMNONE, NULL, NULL, tSe_SyslogParam, NULL, BBFDM_BOTH},
+{CUSTOM_PREFIX"OWSD", &DMREAD, NULL, NULL, "file:/etc/config/owsd", NULL, NULL, &DMNONE, NULL, X_IOPSYS_EU_OWSDObj, X_IOPSYS_EU_OWSDParams, NULL, BBFDM_BOTH},
+{CUSTOM_PREFIX"IGMP", &DMREAD, NULL, NULL, "file:/etc/config/mcast", NULL, NULL, &DMNONE, NULL, X_IOPSYS_EU_IGMPObj, X_IOPSYS_EU_IGMPParams, NULL, BBFDM_BOTH},
+{CUSTOM_PREFIX"MLD", &DMREAD, NULL, NULL, "file:/etc/config/mcast", NULL, NULL, &DMNONE, NULL, X_IOPSYS_EU_MLDObj, X_IOPSYS_EU_MLDParams, NULL, BBFDM_BOTH},
+{CUSTOM_PREFIX"Dropbear", &DMWRITE, add_dropbear_instance, delete_dropbear_instance, "file:/etc/config/dropbear", browseXIopsysEuDropbear, NULL, &DMNONE, NULL, NULL, X_IOPSYS_EU_DropbearParams, NULL, BBFDM_BOTH},
+{CUSTOM_PREFIX"Buttons", &DMREAD, NULL, NULL, "file:/etc/config/buttons", browseXIopsysEuButton, NULL, &DMNONE, NULL, NULL, X_IOPSYS_EU_ButtonParams, NULL, BBFDM_BOTH},
+{"Bridging",&DMREAD, NULL, NULL, "file:/etc/config/network", NULL, NULL, NULL, NULL, tBridgingObj, tBridgingParams, NULL, BBFDM_BOTH},
+{"WiFi",&DMREAD, NULL, NULL, "file:/etc/config/wireless", NULL, NULL, NULL, NULL, tWiFiObj, tWiFiParams, NULL, BBFDM_BOTH},
+{"IP",&DMREAD, NULL, NULL, "file:/etc/config/network", NULL, NULL, NULL, NULL, tIPObj, tIPParams, NULL, BBFDM_BOTH},
+{"Ethernet", &DMREAD, NULL, NULL, "file:/etc/config/network", NULL, NULL, NULL, NULL, tEthernetObj, tEthernetParams, NULL, BBFDM_BOTH},
+{"DSL",&DMREAD, NULL, NULL, "file:/etc/config/dsl", NULL, NULL, NULL, NULL, tDSLObj, tDSLParams, NULL, BBFDM_BOTH},
+{"ATM",&DMREAD, NULL, NULL, "file:/etc/config/dsl", NULL, NULL, NULL, NULL, tATMObj, NULL, NULL, BBFDM_BOTH},
+{"PTM", &DMREAD, NULL, NULL, "file:/etc/config/dsl", NULL, NULL, NULL, NULL, tPTMObj, NULL, NULL, BBFDM_BOTH},
+{"DHCPv4", &DMREAD, NULL, NULL, "file:/lib/netifd/proto/dhcp.sh", NULL, NULL, NULL, NULL, tDHCPv4Obj, tDHCPv4Params, NULL, BBFDM_BOTH},
+{"DHCPv6", &DMREAD, NULL, NULL, "file:/lib/netifd/proto/dhcpv6.sh", NULL, NULL, NULL, NULL, tDHCPv6Obj, tDHCPv6Params, NULL, BBFDM_BOTH},
+#ifdef GENERIC_OPENWRT
 {"Hosts", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tHostsObj, tHostsParams, NULL, BBFDM_BOTH},
-{"NAT", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tNATObj, tNATParams, NULL, BBFDM_BOTH},
-{"PPP", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tPPPObj, tPPPParams, NULL, BBFDM_BOTH},
-{"Routing", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tRoutingObj, tRoutingParams, NULL, BBFDM_BOTH},
+#else
+{"Hosts", &DMREAD, NULL, NULL, "ubus:router.network->hosts", NULL, NULL, NULL, NULL, tHostsObj, tHostsParams, NULL, BBFDM_BOTH},
+#endif
+{"NAT", &DMREAD, NULL, NULL, "file:/etc/config/firewall", NULL, NULL, NULL, NULL, tNATObj, tNATParams, NULL, BBFDM_BOTH},
+{"PPP", &DMREAD, NULL, NULL, "file:/lib/netifd/proto/ppp.sh", NULL, NULL, NULL, NULL, tPPPObj, tPPPParams, NULL, BBFDM_BOTH},
+{"Routing", &DMREAD, NULL, NULL, "file:/etc/config/network", NULL, NULL, NULL, NULL, tRoutingObj, tRoutingParams, NULL, BBFDM_BOTH},
 {"UserInterface", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tUserInterfaceObj, NULL, NULL, BBFDM_BOTH},
-{"Firewall", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tFirewallObj, tFirewallParams, NULL, BBFDM_BOTH},
-{"DNS", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tDNSObj, tDNSParams, NULL, BBFDM_BOTH},
-{"Users", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tUsersObj, tUsersParams, NULL, BBFDM_BOTH},
-{"InterfaceStack", &DMREAD, NULL, NULL, NULL, browseInterfaceStackInst, NULL, NULL, NULL, NULL, tInterfaceStackParams, NULL, BBFDM_BOTH},
+{"Firewall", &DMREAD, NULL, NULL, "file:/etc/config/firewall", NULL, NULL, NULL, NULL, tFirewallObj, tFirewallParams, NULL, BBFDM_BOTH},
+{"DNS", &DMREAD, NULL, NULL, "file:/etc/config/dhcp", NULL, NULL, NULL, NULL, tDNSObj, tDNSParams, NULL, BBFDM_BOTH},
+{"Users", &DMREAD, NULL, NULL, "file:/etc/config/users", NULL, NULL, NULL, NULL, tUsersObj, tUsersParams, NULL, BBFDM_BOTH},
+{"InterfaceStack", &DMREAD, NULL, NULL, "file:/etc/config/network", browseInterfaceStackInst, NULL, NULL, NULL, NULL, tInterfaceStackParams, NULL, BBFDM_BOTH},
 {"USB", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tUSBObj, tUSBParams, NULL, BBFDM_BOTH},
-{"GRE", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL,  NULL, tGREObj, tGREParams, NULL, BBFDM_BOTH},
-{"DynamicDNS", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tDynamicDNSObj, tDynamicDNSParams, NULL, BBFDM_BOTH},
-{"QoS", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tQoSObj, tQoSParams, NULL, BBFDM_BOTH},
-{"XMPP", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tXMPPObj, tXMPPParams, NULL, BBFDM_BOTH},
-{"LANConfigSecurity", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tLANConfigSecurityParams, NULL, BBFDM_BOTH},
+{"GRE", &DMREAD, NULL, NULL, "file:/lib/netifd/proto/gre.sh", NULL, NULL, NULL,  NULL, tGREObj, tGREParams, NULL, BBFDM_BOTH},
+{"DynamicDNS", &DMREAD, NULL, NULL, "file:/etc/config/ddns", NULL, NULL, NULL, NULL, tDynamicDNSObj, tDynamicDNSParams, NULL, BBFDM_BOTH},
+{"QoS", &DMREAD, NULL, NULL, "file:/etc/config/qos", NULL, NULL, NULL, NULL, tQoSObj, tQoSParams, NULL, BBFDM_BOTH},
+{"XMPP", &DMREAD, NULL, NULL, "file:/etc/config/cwmp_xmpp", NULL, NULL, NULL, NULL, tXMPPObj, tXMPPParams, NULL, BBFDM_BOTH},
+{"LANConfigSecurity", &DMREAD, NULL, NULL, "file:/etc/config/users", NULL, NULL, NULL, NULL, NULL, tLANConfigSecurityParams, NULL, BBFDM_BOTH},
 #ifdef BBF_TR157
-{"BulkData", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tBulkDataObj, tBulkDataParams, NULL, BBFDM_BOTH},
-{"SoftwareModules", &DMREAD, NULL, NULL, NULL, NULL, NULL, &DMNONE, NULL, tSoftwareModulesObj, tSoftwareModulesParams, NULL, BBFDM_BOTH},
+{"BulkData", &DMREAD, NULL, NULL, "file:/etc/config/cwmp_bulkdata", NULL, NULL, NULL, NULL, tBulkDataObj, tBulkDataParams, NULL, BBFDM_BOTH},
+{"SoftwareModules", &DMREAD, NULL, NULL, "ubus:swmodules", NULL, NULL, &DMNONE, NULL, tSoftwareModulesObj, tSoftwareModulesParams, NULL, BBFDM_BOTH},
 #endif
 {"Security", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL,  NULL, tSecurityObj, tSecurityParams, NULL, BBFDM_BOTH},
 {0}
diff --git a/dmtree/tr181/deviceinfo.h b/dmtree/tr181/deviceinfo.h
index 01f84b55..3d0fa50a 100644
--- a/dmtree/tr181/deviceinfo.h
+++ b/dmtree/tr181/deviceinfo.h
@@ -15,9 +15,6 @@
 
 #include <libbbf_api/dmcommon.h>
 
-#define UPTIME "/proc/uptime"
-#define DEFAULT_CONFIG_DIR "/etc/config/"
-
 extern DMLEAF tDeviceInfoParams[];
 extern DMLEAF tDeviceInfoVendorConfigFileParams[];
 extern DMLEAF tDeviceInfoVendorLogFileParams[];
diff --git a/libbbf_api/dmbbf.c b/libbbf_api/dmbbf.c
index 513c9f19..c0633f8a 100644
--- a/libbbf_api/dmbbf.c
+++ b/libbbf_api/dmbbf.c
@@ -241,6 +241,36 @@ static int bbfdatamodel_matches(const enum bbfdm_type_enum type)
 	return bbfdatamodel_type == BBFDM_BOTH || type == BBFDM_BOTH || bbfdatamodel_type == type;
 }
 
+static bool check_dependency(const char *conf_obj)
+{
+	/* Available cases */
+	/* one file => "file:/etc/config/network" */
+	/* multiple files => "file:/etc/config/network,/lib/netifd/proto/dhcp.sh" */
+	/* one ubus => "ubus:router.network" (with method : "ubus:router.network->hosts") */
+	/* multiple ubus => "ubus:router.system->info,dsl->status,wifi" */
+	/* common (files and ubus) => "file:/etc/config/network,/etc/config/dhcp;ubus:router.system,dsl->status" */
+
+	char *pch, *spch;
+
+	char *conf_list = dmstrdup(conf_obj);
+	for (pch = strtok_r(conf_list, ";", &spch); pch != NULL; pch = strtok_r(NULL, ";", &spch)) {
+		char *conf_type = strchr(pch, ':');
+		if (!conf_type)
+			return false;
+
+		char *conf_name = dmstrdup(conf_type + 1);
+		*conf_type = '\0';
+
+		char *token, *saveptr;
+		for (token = strtok_r(conf_name, ",", &saveptr); token != NULL; token = strtok_r(NULL, ",", &saveptr)) {
+			if ((!strcmp(pch, "file") && !file_exists(token)) || (!strcmp(pch, "ubus") && !dmubus_object_method_exists(token)))
+				return false;
+		}
+	}
+
+	return true;
+}
+
 int dm_browse_leaf(struct dmctx *dmctx, DMNODE *parent_node, DMLEAF *leaf, void *data, char *instance)
 {
 	int err = 0;
@@ -270,6 +300,9 @@ void dm_browse_entry(struct dmctx *dmctx, DMNODE *parent_node, DMOBJ *entryobj,
 	if (!bbfdatamodel_matches(entryobj->bbfdm_type))
 		return;
 
+	if (entryobj->checkdep && (check_dependency(entryobj->checkdep) == false))
+		return;
+
 	if (dmctx->checkobj) {
 		*err = dmctx->checkobj(dmctx, &node, entryobj->permission, entryobj->addobj, entryobj->delobj, entryobj->forced_inform, entryobj->notification, entryobj->get_linker, data, instance);
 		if (*err)
@@ -280,10 +313,6 @@ void dm_browse_entry(struct dmctx *dmctx, DMNODE *parent_node, DMOBJ *entryobj,
 	if (dmctx->stop)
 		return;
 
-	if (entryobj->checkobj && ((entryobj->checkobj)(dmctx, data) == false) ) {
-		return;
-	}
-
 	if (entryobj->browseinstobj) {
 		if (dmctx->instance_wildchar) {
 			dm_link_inst_obj(dmctx, &node, data, dmctx->instance_wildchar);
diff --git a/libbbf_api/dmbbf.h b/libbbf_api/dmbbf.h
index c7daa627..bcaefc6c 100644
--- a/libbbf_api/dmbbf.h
+++ b/libbbf_api/dmbbf.h
@@ -133,12 +133,12 @@ typedef struct dm_leaf_s {
 } DMLEAF;
 
 typedef struct dm_obj_s {
-	/* OBJ, permission, addobj, delobj, checkobj, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type(13)*/
+	/* OBJ, permission, addobj, delobj, checkdep, browseinstobj, forced_inform, notification, nextdynamicobj, nextobj, leaf, linker, bbfdm_type(13)*/
 	char *obj;
 	struct dm_permession_s *permission;
 	int (*addobj)(char *refparam, struct dmctx *ctx, void *data, char **instance);
 	int (*delobj)(char *refparam, struct dmctx *ctx, void *data, char *instance, unsigned char del_action);
-	bool (*checkobj)(struct dmctx *dmctx, void *data);
+	char *checkdep;
 	int (*browseinstobj)(struct dmctx *dmctx, struct dmnode *node, void *data, char *instance);
 	struct dm_forced_inform_s *forced_inform;
 	struct dm_notif_s *notification;
diff --git a/libbbf_api/dmcommon.c b/libbbf_api/dmcommon.c
index e0c7e3e2..f117d76f 100644
--- a/libbbf_api/dmcommon.c
+++ b/libbbf_api/dmcommon.c
@@ -411,7 +411,7 @@ void update_section_list(char *config, char *section, char *option, int number,
 	struct uci_section *s = NULL;
 	int i = 0;
 
-	if (strncmp(config, DMMAP, 5) == 0) {
+	if (strcmp(config, DMMAP) == 0) {
 		if (option) {
 			uci_path_foreach_option_eq(bbfdm, config, section, option, filter, s) {
 				return;
diff --git a/libbbf_api/dmcommon.h b/libbbf_api/dmcommon.h
index 2fde4d1c..4f3f0fdd 100644
--- a/libbbf_api/dmcommon.h
+++ b/libbbf_api/dmcommon.h
@@ -103,11 +103,11 @@ extern char *IPv6Prefix[];
 extern char *SupportedOperatingChannelBandwidth[];
 extern char *SupportedStandards[];
 
-#define NVRAM_FILE "/proc/nvram/WpaKey"
+#define UPTIME "/proc/uptime"
+#define DEFAULT_CONFIG_DIR "/etc/config/"
 #define MAX_DHCP_LEASES 256
 #define MAX_PROC_ROUTING 256
 #define ROUTING_FILE "/proc/net/route"
-#define ARP_FILE "/proc/net/arp"
 #define DHCP_LEASES_FILE "/tmp/dhcp.leases"
 #define DMMAP "dmmap"
 #define DHCPSTATICADDRESS_DISABLED_CHADDR "00:00:00:00:00:01"
diff --git a/libbbf_api/dmubus.c b/libbbf_api/dmubus.c
index 7c66e913..ca642a2e 100644
--- a/libbbf_api/dmubus.c
+++ b/libbbf_api/dmubus.c
@@ -36,6 +36,8 @@ static struct blob_buf b;
 static struct ubus_context *ubus_ctx;
 static int timeout = 1000;
 static json_object *json_res = NULL;
+static char ubus_method[32] = {0};
+static bool ubus_method_exists = false;
 
 static void dm_libubus_free()
 {
@@ -200,6 +202,52 @@ int dmubus_call(char *obj, char *method, struct ubus_arg u_args[], int u_args_si
 	return 0;
 }
 
+static void receive_list_result(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
+{
+	struct blob_attr *cur;
+	size_t rem;
+
+	if (!obj->signature  || *ubus_method == '\0')
+		return;
+
+	blob_for_each_attr(cur, obj->signature, rem) {
+		const char *method_name = blobmsg_name(cur);
+		if (!strcmp(ubus_method, method_name)) {
+			ubus_method_exists = true;
+			return;
+		}
+	}
+}
+
+bool dmubus_object_method_exists(const char *obj)
+{
+	if (ubus_ctx == NULL) {
+		ubus_ctx = dm_libubus_init();
+		if (ubus_ctx == NULL)
+			return false;
+	}
+
+	char *method = "";
+	// check if the method exists in the obj
+	// if yes, copy it in ubus_method buffer
+	char *delimiter = strstr(obj, "->");
+	if (delimiter) {
+		method = dmstrdup(delimiter + 2);
+		*delimiter = '\0';
+	}
+
+	strncpy(ubus_method, method, sizeof(ubus_method) - 1);
+	ubus_method_exists = false;
+
+	if (ubus_lookup(ubus_ctx, obj, receive_list_result, NULL))
+		return false;
+
+	if (*ubus_method != '\0' && !ubus_method_exists)
+		return false;
+
+	return true;
+}
+
 void dmubus_free()
 {
 	struct dm_ubus_cache_entry *entry, *tmp;
diff --git a/libbbf_api/dmubus.h b/libbbf_api/dmubus.h
index 0729b582..3fbef888 100644
--- a/libbbf_api/dmubus.h
+++ b/libbbf_api/dmubus.h
@@ -29,6 +29,7 @@ struct ubus_arg {
 
 int dmubus_call(char *obj, char *method, struct ubus_arg u_args[], int u_args_size, json_object **req_res);
 int dmubus_call_set(char *obj, char *method, struct ubus_arg u_args[], int u_args_size);
+bool dmubus_object_method_exists(const char *obj);
 void dmubus_free();
 
 #endif