diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/Constants.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/Constants.java
index 0419529..98253cf 100644
--- a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/Constants.java
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/Constants.java
@@ -27,6 +27,21 @@
 
     private static final String DEFAULT_SERVER_IP = "localhost";
 
+    // default configuration variables for gRPC
+    public static final String DEFAULT_GRPC_SERVER_IP = DEFAULT_SERVER_IP;
+    public static final int DEFAULT_GRPC_SERVER_PORT = 50051;
+    public static final boolean DEFAULT_GRPC_USE_PLAINTEXT = true;
+    public static final int DEFAULT_GRPC_MAX_INBOUND_MSG_SIZE = 4 * 1024 * 1024;
+
+    // default configuration variables for InfluxDB
+    public static final String DEFAULT_INFLUXDB_SERVER_IP = DEFAULT_SERVER_IP;
+    public static final int DEFAULT_INFLUXDB_SERVER_PORT = 8086;
+    public static final String DEFAULT_INFLUXDB_USERNAME = "onos";
+    public static final String DEFAULT_INFLUXDB_PASSWORD = "onos";
+    public static final String DEFAULT_INFLUXDB_DATABASE = "onos";
+    public static final boolean DEFAULT_INFLUXDB_ENABLE_BATCH = true;
+
+    // default configuration variables for Kafka
     public static final String DEFAULT_KAFKA_SERVER_IP = DEFAULT_SERVER_IP;
     public static final int DEFAULT_KAFKA_SERVER_PORT = 9092;
     public static final int DEFAULT_KAFKA_RETRIES = 0;
@@ -39,6 +54,12 @@
     public static final String DEFAULT_KAFKA_VALUE_SERIALIZER =
             "org.apache.kafka.common.serialization.ByteArraySerializer";
 
+    // default configuration variables for REST API
     public static final String DEFAULT_REST_SERVER_IP = DEFAULT_SERVER_IP;
     public static final int DEFAULT_REST_SERVER_PORT = 80;
+    public static final String DEFAULT_REST_ENDPOINT = "telemetry";
+    public static final String DEFAULT_REST_METHOD = "POST";
+    public static final String DEFAULT_REST_REQUEST_MEDIA_TYPE = "application/json";
+    public static final String DEFAULT_REST_RESPONSE_MEDIA_TYPE = "application/json";
+
 }