Orion Context Broker & Associations

Question

I've been trying to get a setup running that enables associations the Orion Context Broker.

I've been following the Users and Programmers Guide on the FIWARE wiki, where the functionality is explained by:

First registering "Room1" and "Room2" entities, as described here: https://forge.fiware.org/plugins/mediawiki/wiki/fiware/index.php/Publish/Subscribe_Broker_-_Orion_Context_Broker_-_User_and_Programmers_Guide#Register_Context_operation

This works as expected. Then I follow the steps for associations here: https://forge.fiware.org/plugins/mediawiki/wiki/fiware/index.php/Publish/Subscribe_Broker_-_Orion_Context_Broker_-_User_and_Programmers_Guide#Associations

All the registrations goes through as expected, however, when I try to "discoverContextAvailability", I get a "NGSI 404" back that looks like this:

REQUEST:

<?xml version="1.0"?>
<discoverContextAvailabilityRequest>
  <entityIdList>
    <entityId type="Room" isPattern="false">
      <id>Room2</id>
    </entityId>
  </entityIdList>
  <attributeList>
    <attribute>temperature</attribute>
  </attributeList>
  <restriction>
    <scope>
      <operationScope>
        <scopeType>IncludeAssociations</scopeType>
        <scopeValue>SOURCES</scopeValue>
      </operationScope>
    </scope>
  </restriction>
</discoverContextAvailabilityRequest>

RESPONSE:

<discoverContextAvailabilityResponse>
  <errorCode>
    <code>404</code>
    <reasonPhrase>No context element found</reasonPhrase>
    <details>Could not query association with combination of entity/attribute</details>
  </errorCode>
</discoverContextAvailabilityResponse>

As an side-note, I would like to mention that I am trying to integrate the Orion Configuration Manager with the NEC IoT Broker, and when the IoT Broker sends a discoverContextAvailability to the Orion, it also includes the restriction that tells Orion to "include associations", which results in the same error described below (even though there are no associations registered in this case).

I could really use some help.

UPDATE 1 Result of echo 'db.registrations.find()' | mongo orion:

{ "_id" : ObjectId("54d4acdfa85d6301365b7240"), "expiration" : NumberLong(1423310431), "contextRegistration" : [        {       "entities" : [  {       "id" : "Filtered000D6F000277BCC0",      "type" : "FilteredSmartPlug" } ],       "attrs" : [  {       "name" : "currentPower",        "type" : "float",       "isDomain" : "false" } ],       "providingApplication" : "http://localhost/EspR4FastData/" } ] }
{ "_id" : ObjectId("54e1c2e7a85d6301365b7314"), "expiration" : NumberLong(1424513639), "contextRegistration" : [        {       "entities" : [  {       "id" : "30DE8600002001C4",      "type" : "SmartPlug" } ],       "attrs" : [     {   "name" : "name",         "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "manufacturer",        "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "model",       "type" : "xs:string",   "isDomain" : "false" },      {       "name" : "protocol",    "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "currentPower",        "type" : "xs:float",    "isDomain" : "false" },         {       "name" : "currentState",     "type" : "xs:integer",  "isDomain" : "false" } ],       "providingApplication" : "http://10.42.82.127:8080/zpa/ngsi" } ] }
{ "_id" : ObjectId("54e1c2f9a85d6301365b7315"), "expiration" : NumberLong(1424513657), "contextRegistration" : [        {       "entities" : [  {       "id" : "30DE8600002001C4",      "type" : "SmartPlug" } ],       "attrs" : [     {   "name" : "name",         "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "manufacturer",        "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "model",       "type" : "xs:string",   "isDomain" : "false" },      {       "name" : "protocol",    "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "currentPower",        "type" : "xs:float",    "isDomain" : "false" },         {       "name" : "currentState",     "type" : "xs:integer",  "isDomain" : "false" } ],       "providingApplication" : "http://10.42.82.127:8080/zpa/ngsi" } ] }
{ "_id" : ObjectId("54e1c3aaa85d6301365b7316"), "expiration" : NumberLong(1424513834), "contextRegistration" : [        {       "entities" : [  {       "id" : "30DE8600002001C4",      "type" : "SmartPlug" } ],       "attrs" : [     {   "name" : "name",         "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "manufacturer",        "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "model",       "type" : "xs:string",   "isDomain" : "false" },      {       "name" : "protocol",    "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "currentPower",        "type" : "xs:float",    "isDomain" : "false" },         {       "name" : "currentState",     "type" : "xs:integer",  "isDomain" : "false" } ],       "providingApplication" : "http://10.42.82.127:8080/zpa/ngsi" } ] }
{ "_id" : ObjectId("54e1c416a85d6301365b7317"), "expiration" : NumberLong(1424513942), "contextRegistration" : [        {       "entities" : [  {       "id" : "30DE8600002001C5",      "type" : "SmartPlug" } ],       "attrs" : [     {   "name" : "name",         "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "manufacturer",        "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "model",       "type" : "xs:string",   "isDomain" : "false" },      {       "name" : "protocol",    "type" : "xs:string",   "isDomain" : "false" },         {       "name" : "currentPower",        "type" : "xs:float",    "isDomain" : "false" },         {       "name" : "currentState",     "type" : "xs:integer",  "isDomain" : "false" } ],       "providingApplication" : "http://10.42.82.127:8080/zpa/ngsi" } ] }
{ "_id" : ObjectId("54e1ce41a85d6301365b7318"), "expiration" : NumberLong(1424084605), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d2eda85d6301365b7319"), "expiration" : NumberLong(1424085801), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d333a85d6301365b731a"), "expiration" : NumberLong(1424085871), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d334a85d6301365b731b"), "expiration" : NumberLong(1424085872), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d56ea85d6301365b731c"), "expiration" : NumberLong(1424086442), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d922a85d6301365b731d"), "expiration" : NumberLong(1426679330), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d92da85d6301365b731e"), "expiration" : NumberLong(1426679341), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1d97ba85d6301365b731f"), "expiration" : NumberLong(1426679419), "contextRegistration" : [        {       "entities" : [  {       "id" : "Room1",         "type" : "Room" },      {       "id" : "Room2",         "type" : "Room" } ],         "attrs" : [     {       "name" : "temperature",         "type" : "float",       "isDomain" : "false" },         {       "name" : "pressure",    "type" : "integer",     "isDomain" : "false" } ],       "providingApplication" : "http://mysensors.com/Rooms" } ] }
{ "_id" : ObjectId("54e1d9afa85d6301365b7320"), "expiration" : NumberLong(1426679471), "contextRegistration" : [        {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1dd0fa85d6369180b7c49"), "expiration" : NumberLong(1426680335), "servicePath" : "/", "contextRegistration" : [   {       "entities" : [  {       "id" : "Room1",         "type" : "Room" },      {       "id" : "Room2",      "type" : "Room" } ],    "attrs" : [     {       "name" : "temperature",         "type" : "float",       "isDomain" : "false" },         {       "name" : "pressure",    "type" : "integer",     "isDomain" : "false" } ],       "providingApplication" : "http://mysensors.com/Rooms" } ] }
{ "_id" : ObjectId("54e1dd47a85d6369180b7c4a"), "expiration" : NumberLong(1426680391), "servicePath" : "/", "contextRegistration" : [   {       "entities" : [  {       "id" : "Room1",         "type" : "Room" },      {       "id" : "Room2",      "type" : "Room" } ],    "attrs" : [     {       "name" : "temperature",         "type" : "float",       "isDomain" : "false" },         {       "name" : "pressure",    "type" : "integer",     "isDomain" : "false" } ],       "providingApplication" : "http://mysensors.com/Rooms" } ] }
{ "_id" : ObjectId("54e1ddc1a85d6369180b7c4d"), "expiration" : NumberLong(1426680513), "servicePath" : "/", "contextRegistration" : [   {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1ddc2a85d6369180b7c4e"), "expiration" : NumberLong(1426680514), "servicePath" : "/", "contextRegistration" : [   {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1ddc2a85d6369180b7c4f"), "expiration" : NumberLong(1426680514), "servicePath" : "/", "contextRegistration" : [   {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }
{ "_id" : ObjectId("54e1ddc3a85d6369180b7c50"), "expiration" : NumberLong(1426680515), "servicePath" : "/", "contextRegistration" : [   {       "entities" : [ ],       "attrs" : [ ],  "providingApplication" : "http://www.fi-ware.eu/NGSI/association" } ] }

UPDATE 2

After deleting the database, the procedure described in the guide now works. I get a response back when an entity has an assocation. If the entity on the other hand does not have an association, the query still returns the error 'Could not query association with combination of entity/attribute'.

However. My initial problem started by the fact that the NEC IoT Broker made this request to the Configuration Manager (always including the restriction for associations), which means that whenever I query data on the IoT Broker that does NOT have associations, it fails. Is this really the correct behaviour?

Answer 1

The problem seems related with overlapping registrations in the Orion database. After cleaning the DB and repeat the test, it worked (according to user's report).