Add device identifier for configuration retrieval endpoint

components/device-mgt/org.wso2.carbon.device.mgt.common/src/main/java/org/wso2/carbon/device/mgt/common/configuration/mgt/DeviceConfiguration.java

@@ -32,7 +32,7 @@ import java.util.List;
                                                        "the server")
 public class DeviceConfiguration {
     @ApiModelProperty(name = "deviceId", value = "ID of the device", required = true)
-    private int deviceId;
+    private String deviceId;
 
     @ApiModelProperty(name = "deviceType", value = "Type of the device", required = true)
     private String deviceType;
@@ -52,11 +52,11 @@ public class DeviceConfiguration {
     @ApiModelProperty(name = "deviceOwner", value = "Owner of the selected device", required = true)
     private String deviceOwner;
 
-    public int getDeviceId() {
+    public String getDeviceId() {
         return deviceId;
     }
 
-    public void setDeviceId(int deviceId) {
+    public void setDeviceId(String deviceId) {
         this.deviceId = deviceId;
     }
 

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -3352,7 +3352,7 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
                                                    List<ConfigurationEntry> configurationEntries,
                                                    String deviceOwner) {
         DeviceConfiguration deviceConfiguration = new DeviceConfiguration();
-        deviceConfiguration.setDeviceId(device.getId());
+        deviceConfiguration.setDeviceId(device.getDeviceIdentifier());
         deviceConfiguration.setDeviceType(device.getType());
         deviceConfiguration.setTenantDomain(tenantDomain);
         deviceConfiguration.setConfigurationEntries(configurationEntries);