Use case 12
Protection of conservation workers.
Use Case 12 is dedicated to information related to the protection in real time of workers who carry out conservation actions on the roads. This service include the information provided by Connected Cones
Receipt and publication of data related to the real-time positioning of:
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Maintenance workers
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Construction and maintenance vehicles found on the tracks
This information can be sent to the DGT 3.0 platform either by IoT devices or by Apps that can be used to position these elements on the road.
The platform has two different functionalities for the publication (sending) and for the subscription (reception) of information. The first is through a REST API and the second through a real-time MQTT service.
Both the publication and subscription functionality require different access certificates that must be requested and supplied by DGT 3.0. If these certificates have not already been requested, they should be requested from soporte@cmobility30.es.
Below are the URLs with which each functionality is accessed:
Mode | URL | Description |
---|---|---|
Publication | https://pre.cmobility30.es/use-case-12 | Client integration environment endpoint for publishing |
Subscription | mqtt://mqtt.pre.cmobility30.es:8883 | Integration environment endpoint for subscription |
The two functionalities are described below.
Publication
This use case has a REST API for the publication (sending) of the data by the companies that request it. Details of this can be found in the following sections:
- General details for making a request:
- The details of the master tables and data that can compose the event:
- The structure of the event can be seen here:
Subscription
This use case also has a subscription service (reception) to the data for the companies that request it through the MQTT protocol. Below you can find the details of this:
MQTT (MQ Telemetry Transport) is a messaging protocol used as a simple and lightweight method to transfer data to / from low-power devices.
The protocol supports a single messaging pattern, the Publish-Subscribe pattern: each message is published on a topic that must be subscribed to in order to receive the information.
Subscription to the service of this use case must be through the topic:
usecase12/events
In the topic, the events are published in JSON format. Here you can see an example:
{
"actionId": "CLI_235",
"beaconId": "cff92179-dc0a-47da-bd9e-5e9c5b14d251",
"beaconTypeId": 1,
"timestamp": "2021-06-02T13:34:56.747Z",
"lon": -4.304818,
"lat": 41.312456,
"eventTypeId": 1,
"speed": 85,
"provinceId": 40,
"road": "A-601",
"pk": 64.73,
"direction": "UP"
}
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actionId (text): unique identifier of the event
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beaconId (text): unique identifier of the beacon (for example, the MAC)
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beaconTypeId (integer number): beacon type identifier. 1 = Start, 2 = End, 3 = Intermediate, 4 = Unique
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timestamp (UTC time): date and time in UTC format of when the event was generated. It must be a maximum of 30 seconds old with respect to UTC time. The date must end with the character 'Z' that marks that it is in UTC
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lon (decimal number): longitude in WGS 84 coordinate system where the event was generated
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lat (decimal number): latitude in WGS 84 coordinate system where the event was generated
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vehicleTypeId (integer number): vehicle type identifier. 0 = None, 1 = Car, 2 = Motorbike
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deviceTypeId (integer number): identifier of the type of device from which the information is sent. 1 = Baliza, 2 = Chaleco, 3 = Cono
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deviceUseTypeId (integer number): identifier of the type of use of the device that sends the information. 1 = Worker, 2 = Vehicle, 3 = Infrastructure
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speed (integer number): speed measured in kilometers per hour at which the element is at the moment it sends the event
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provinceId (integer number): identifier of the province where the event is generated according to the INE
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road (integer number): official name of the road where the event is generated
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pk (integer number): kilometer point where the event is generated
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direction (String): direction of the road where the event is generated. UP = Upward direction, DOWN = Downward direction, UNKNOWN = Unknown
See more information and a connection example here.
Errors
As stated above, all HTTP responses other than 200 – OK, can be considered invalid. The format of the error response is like the following example:
{
"status": 401,
"code": 1,
"message": "User not found or valid"
}
These errors will have three main categories:
Authentication Error
-
HTTP Status: 401 - Unauthorized
Code Message 1 User not found or valid
Client Error
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HTTP Status: 400 - Bad Request
Code Message 0 Authenticate 2 Entity ID not found 3 Missing required property 4 The entity received cannot be proccessed 5 Incorrect token received 6 Expired token received 7 There is an error with the token provided. Please request a new one 8 No token received 9 Required request body is missing 10 Event is marked as expired by timestamp 11 Missing request header 12 Permission denied. Role assigned to user missing 13 There is an error in one or more elements of the list 14 Cone use type must be Infraestructure 15 Cone vehicle type must be None 16 Cone beacon type must be Unique
In the case of getting an error 3 - Missing required property, the response obtained will have a value in the message that will indicate the missing fields to send:
{
"status": 400,
"code": 3,
"message": "[deviceTypeId: must not be null, deviceUseTypeId: must not be null, informationQualityId: must not be null]"
}
Server Error
-
HTTP Status: 500 - Internal Server Error
Code Message 17 Internal error