+/**
+ * check connection status.
+ * @param[in] address the address of the remote device.
+ * @return true or false.
+ */
+bool CALEServerIsConnected(const char* address);
+
+/**
+ * get MTU size.
+ * @param[in] address the address of the remote device.
+ * @return mtu size negotiated from remote device.
+ */
+uint16_t CALEServerGetMtuSize(const char* address);