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Tourguide App: problem sending data to sensor

asked 2017-01-19 09:51:36 +0100

lukas gravatar image

updated 2017-01-27 13:53:12 +0100


In the Tourguide App documentation, I can't see the attributes of the created sensor when following Manage IoT Data section.

I just tried with a clean install of the tutorial, and this is what I get:

(if anybody can tell me how I can make the json format look nicer in markdown syntax, any hint would be welcome... I'll update the code below)

I post following request to create the IDAS service:

curl -X POST -H "Content-Type: application/json" -H "fiware-service: tourguide" -H "fiware-servicepath: /Franchise1" -H "Cache-Control: no-cache" -d '{ "services": [ { "apikey": "tourguide-devices", "cbroker": "http://orion:1026", "resource": "/iot/d", "entity_type": "Restaurant" } ] }' "http://localhost:4041/iot/services"

with header: Content-Type:application/json fiware-service:tourguide fiware-servicepath:/Franchise1

then I registered the sensor as following with the same headers

curl -X POST -H "Content-Type: application/json" -H "fiware-service: tourguide" -H "fiware-servicepath: /Franchise1" -H "Cache-Control: no-cache" -d '{ "devices": [ { "device_id": "myRestaurant-sensor-0115206c51f60b48b77e4c937835795c33bb953f", "protocol": "UL20", "entity_name": "0115206c51f60b48b77e4c937835795c33bb953f", "entity_type": "Sensor", "type" "attributes": [ { "object_id": "mt", "name": "myTemperature", "type": "number" } ] } ] }' "http://localhost:4041/iot/devices"

(both requests return 200 and 201 with {}, so it looks fine)

Then querying the entity to see if the attributes are there with:

curl -X GET -H "Accept: application/json" -H "fiware-service: tourguide" -H "fiware-servicepath: /Franchise1" -H "Cache-Control: no-cache" "http://localhost:1026/v2/entities/0115206c51f60b48b77e4c937835795c33bb953f?options=keyValues&type=Restaurant"

gives me this answer:

{ "id": "0115206c51f60b48b77e4c937835795c33bb953f", "type": "Restaurant", "address": { "streetAddress": "Cuesta de las Cabras Aldapa 2", "addressRegion": "Araba", "addressLocality": "Alegría-Dulantzi", "postalCode": "01240" }, "aggregateRating": { "reviewCount": 1, "ratingValue": 4 }, "capacity": 120, "department": "Franchise1", "description": "Restaurante de estilo sidrería ubicado en Alegria-Dulantzi. Además de su menú del día y carta, también ofrece menú de sidrería. El menú del día cuesta 9 euros. Los fines de semana la especialidad de la casa son las alubias con sacramentos. En lo que a bebidas se refiere, hay una amplia selección además de la sidra. Cabe destacar que se puede hacer txotx. La capacidad del establecimiento es de 50 personas pero la sidrería no dispone de aparcamiento.%5cn%5cnHORARIO: %5cn%5cnLunes a domingo: 9:00-17:00 y 19:00-23:00.", "location": "42.8404625, -2.5123277", "name": "Elizalde", "occupancyLevels": 0, "priceRange": 0, "telephone": "945 400 868" }

--> So no sign of the added attribute... Why is that?

If I do the request without "type=Restaurant" i get:

{ "error": "TooManyResults", "description": "More than one matching entity. Please refine your query" }

Why are there more than one result on a request specifying an entity with a unique id?

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answered 2017-01-27 14:00:54 +0100

lukas gravatar image

Ok, I sorted it out finally. It is related to the "entitytype" set when registering the sensor. I thougth I had to put it to "sensor", but I should have put it to the "entityname"'s type, which is "Restaurant".

So the "tooManyResult" error I got was, as explained by jmcantera, related to different entities with same id but of different types.

But we can effectiveley request an entity to see if the sensor was added before sending any sensor data update, as described in "Register a new sensor with the IoT Agent" in this doc: http://fiwaretourguide.readthedocs.io...

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answered 2017-01-20 08:42:46 +0100

jmcantera gravatar image


you cannot have in your entity any property measured by sensors if you don't POST IoT data to an IoT Agent. You have only registered your service and your device ... i.e. you have finished the configuration phase and now you need to actually send data.

Please check http://fiwaretourguide.readthedocs.io... and the point entitled "Send Observations related to your IoT device".

That can be done manually as described by the guide above or you can use the CLI provided by the Tour Guide Application, see


Wrt to the error you get when do not provide the type parameter maybe there are other entities with the same id, that by mistake you created. As Orion Context Broker uses type and id as the entity key if you don't specify the type explicitly more than one entity will match, and as a result, you get that error

I hope this helps


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Hello, Thanks for your answer. If I look at the second link you provide, the last request at the end of "Register a new sensor with the IoT Agent" section tells: "We can do a request to orion for the restaurant and see if the new attribute has been added". This is before sending data, same as I do.

lukas gravatar imagelukas ( 2017-01-20 14:41:00 +0100 )edit
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Asked: 2017-01-19 09:51:36 +0100

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Last updated: Jan 27