Question

我尝试将Orion CB用作物联网代理的Contex提供商，我在其中注册了仅具有延迟属性的设备。

在物联网代理上我需要处理updateContext请求，所以我为这些请求做了一个处理程序，如下所示：

iotAgentLib.setDataUpdateHandler(updateContextHandler);

在updateContextHandler函数中，我只有一条指令：

console.log(attributes);

为了查看是否已正确接收我要更新的所有值。

现在，如果我对设备所代表的实体的某个属性进行更新：

curl -i -X POST \
-H "fiware-service:service1" \
-H "fiware-servicepath:/subservice1" \
-H "X-Auth-Token:wNRwDwqYlLoLD8U9sFkTAEE6PfYMbQ" \
-H "Content-Type:application/json" \
-d \
'{
    "contextElements": [
        {
            "id": "ncc_estimate",
            "attributes": [
                {
                    "name": "arrival",
                    "type": "string",
                    "value": "some_value"
                }
            ]
        }
    ],
    "updateAction": "UPDATE"
} ' \
'http://{orion_address}/v1/updateContext'

我在IoT Agent输出控制台上看到的是：

time=2018-01-09T08:14:59.539Z | lvl=DEBUG | corr=2f4fdb0c-f515-11e7-86b2-0242ac110003 | trans=6ac5c35d-d7bf-419c-8f64-bc843b991d47 | op=IoTAgentNGSI.GenericMiddlewares | srv=service1 | subsrv=/subservice1 | msg=Body:

{
    "contextElements": [
        {
            "type": "nccestimate",
            "isPattern": "false",
            "id": "ncc_estimate",
            "attributes": [
                {
                    "name": "arrival",
                    "type": "string",
                    "value": ""
                }
            ]
        }
    ],
    "updateAction": "UPDATE"
}

您可以看到值字段为空，我也可以从UpdateHandler函数中的console.log（）输出中看到：

[ { name: 'arrival', type: 'string', value: '' } ]

似乎Orion在将值发送给IoT代理之前删除了该值。可能是什么问题呢？我做错了什么？

编辑：

以下是对以下呼叫的响应：/ v1 / registry / contextEntities / ncc_estimate

{"contextRegistrationResponses":[
    {"contextRegistration":
        {"entities":[
            {
                "type":"nccestimate",
                "isPattern":"false",
                "id":"ncc_estimate"
            }
        ],
        "attributes":[
            {
                "name":"transport_type",
                "type":"string",
                "isDomain":"false"
            },
            {
                "name":"arrival",
                "type":"string",
                "isDomain":"false" 
           }
        ],
        "providingApplication":"http://192.168.199.151:4044"}
    }
]}

EDIT2：

执行前面描述的updateContext操作时，这是Orion发送给iot代理的内容：

POST //updateContext HTTP/1.1
User-Agent: orion/1.10.0-next libcurl/7.19.7
Host: 192.168.199.151:4044
fiware-service: service1
Fiware-ServicePath: /subservice1
X-Auth-Token: M62UkJc7yKX5aQwaHrsODfIrV4Ou85
Accept: application/json
Content-length: 169
Content-type: application/json; charset=utf-8
Fiware-Correlator: 42561e9a-f615-11e7-8610-0242ac110003

{"contextElements":[{"type":"nccestimate","isPattern":"false","id":"ncc_estimate","attributes":[{"name":"arrival","type":"string","value":""}]}],"updateAction":"UPDATE"}

你可以看到＆＃34;值＆＃34;属性的字段为空。我使用的是Orion版本1.10.0和iot代理节点lib版本2.5.1。

Answer 1

我使用与您相同的CB版本（即1.10.0）进行了以下测试

首先，创建IOTA创建的注册：

(curl -s -S localhost:1026/v1/registry/registerContext -H "fiware-service:service1" -H "fiware-servicepath:/subservice1" -H 'Content-Type: application/json' -d @- | python -mjson.tool) <<EOF
{
    "contextRegistrations": [
        {
            "entities": [
                {
                    "type": "nccestimate",
                    "isPattern": "false",
                    "id": "ncc_estimate"
                }
            ],
            "attributes": [
                {
                    "name": "transport_type",
                    "type": "string",
                    "isDomain": "false"
                },
                {
                    "name": "arrival",
                    "type": "string",
                    "isDomain": "false"
                }
            ],
            "providingApplication": "http://localhost:4044"
        }
    ],
    "duration": "P1M"
}
EOF

接下来，检查问题帖子中显示的注册完全相同（providingApplication除外，指向localhost）：

curl localhost:1026/v1/registry/contextEntities/ncc_estimate -s -S -H "fiware-service:service1" -H "fiware-servicepath:/subservice1" -H 'Accept: application/json' | python -mjson.tool

哪个回复是

{
    "contextRegistrationResponses": [
        {
            "contextRegistration": {
                "attributes": [
                    {
                        "isDomain": "false",
                        "name": "transport_type",
                        "type": "string"
                    },
                    {
                        "isDomain": "false",
                        "name": "arrival",
                        "type": "string"
                    }
                ],
                "entities": [
                    {
                        "id": "ncc_estimate",
                        "isPattern": "false",
                        "type": "nccestimate"
                    }
                ],
                "providingApplication": "http://localhost:4044"
            }
        }
    ]
}

接下来，在nc端口的localhost上运行providingApplication进程。

nc -l -p 4044

设置完成后，首先让我们根据问题中的更新进行测试。

curl -s -S -X POST http://localhost:1026/v1/updateContext -H "fiware-service:service1" -H "fiware-servicepath:/subservice1" -H "Content-Type:application/json" -d @- <<EOF
{
    "contextElements": [
        {
            "id": "ncc_estimate",
            "attributes": [
                {
                    "name": "arrival",
                    "type": "string",
                    "value": "some_value"
                }
            ]
        }
    ],
    "updateAction": "UPDATE"
}
EOF

在这种情况下，Orion不会识别注册并返回Not Found响应：

{
    "contextResponses": [{
        "contextElement": {
            "type": "",
            "isPattern": "false",
            "id": "ncc_estimate",
            "attributes": [{
                "name": "arrival",
                "type": "string",
                "value": ""
            }]
        },
        "statusCode": {
            "code": "404",
            "reasonPhrase": "No context element found",
            "details": "ncc_estimate"
        }
    }]
}

换句话说，猎户座没有转发响应。我不知道为什么在你的情况下被转发并在IOTA日志文件中留下痕迹。

下一个测试使用相同的请求，但为实体添加了type字段。

curl -s -S -X POST http://localhost:1026/v1/updateContext -H "fiware-service:service1" -H "fiware-servicepath:/subservice1" -H "Content-Type:application/json" -d @- <<EOF
{
    "contextElements": [
        {
            "id": "ncc_estimate",
            "type": "nccestimate",
            "attributes": [
                {
                    "name": "arrival",
                    "type": "string",
                    "value": "some_value"
                }
            ]
        }
    ],
    "updateAction": "UPDATE"
}
EOF

在这种情况下，转发请求，我在nc终端中获取此信息。

POST //updateContext HTTP/1.1
User-Agent: orion/1.10.0 libcurl/7.38.0
Host: localhost:4044
fiware-service: service1
Fiware-ServicePath: /subservice1
Accept: application/json
Content-length: 179
Content-type: application/json; charset=utf-8
Fiware-Correlator: 42e75f8a-fa0d-11e7-93f1-000c29173617

{"contextElements":[{"type":"nccestimate","isPattern":"false","id":"ncc_estimate","attributes":[{"name":"arrival","type":"string","value":"some_value"}]}],"updateAction":"UPDATE"}

请注意响应中的some_value。在这种情况下，Orion似乎正在正确地进行请求。

编辑：根据用户的反馈，实体type解决了问题。我们在the documentation regarding Context Providers中强调了它：

您应该在查询/更新中包含实体类型，以便ContextBroker能够转发到上下文提供者

Orion CB不会更新物联网代理

1 个答案: