Subscription failure "Server returned nothing (no headers, no data)" [Example 2]

[daniel9029]

Good afternoon,

I'm having some issues following the Example 2 tutorial steps.
After I solved some server connection problem (the port 9001 wasn't configured suitably in the config file), I've created the Room entity and then subscribed to the attributes changes. But this last step gave me this error:

orion | time=Thursday 14 May 13:46:50 2020.723Z | lvl=INFO | corr=N/A | trans=N/A | from=N/A | srv=N/A | subsrv=N/A | comp=Orion | op=connectionOperations.cpp[454]:collectionUpdate | msg=Database Operation Successful (update: <{ _id: ObjectId('5ebd4b94a1d4397897f1e71e'), $or: [ { lastFailure: { $lt: 1589463956 } }, { lastFailure: { $exists: false } } ] }, { $set: { lastFailure: 1589463956, lastFailureReason: "Server returned nothing (no headers, no data)" } }>).

Here is the modified yml file: version: '3.5' services: mongo-db: image: mongo:3.6 hostname: mongo-db container_name: db-mongo expose:

• "27017" ports:
• "27017:27017" networks:
• default command: --bind_ip_all --smallfiles --nojournal volumes:
  • mongo-db:/data orion: image: fiware/orion:latest hostname: orion container_name: orion depends_on:
• mongo-db networks:
• default expose:
• "1026" ports:
• "1026:1026" command: -dbhost mongo-db -logLevel DEBUG jobmanager: image: flink:1.9.0-scala_2.11 container_name: flink-jobmanager expose:
• "6123" ports:
• "8081:8081"
• "9001:9001" command: jobmanager environment:
• JOB_MANAGER_RPC_ADDRESS=jobmanager taskmanager: image: flink:1.9.0-scala_2.11 hostname: taskmanager container_name: flink-taskmanager ports:
• "6121:6121"
• "6122:6122" depends_on:
• jobmanager command: taskmanager links:
• "jobmanager:jobmanager" environment:
• JOB_MANAGER_RPC_ADDRESS=jobmanager

Thank you for your attention!

[sonsoleslp]

Hi, Make sure your Flink job is running and that you have subscribed to notifications in Orion using the right callback URL. If the job is not running or the callback URL is unreachable, the notification will fail.

[daniel9029]

Hi, thank you for the answer. Yes, the Flink job related to the Example2 is running (as you can see from the screenshot below)

I can correctly submit a new entity with the script provided under files/example2/curl_CreateNewEntity.sh, but when I try to subscribe to the attributes change with the script under files/example2/curl_SubscribeToEntityNotifications.sh, this happens:

Am I wrong in something?

Thank you again for your patience!

[sonsoleslp]

If you are using the Flink Job Manager then you are already on example 3. Try subscribing as it's done in this file: https://github.com/ging/fiware-cosmos-orion-flink-connector-examples/blob/master/files/example3/curl_SubscribeToEntityNotifications.sh

[daniel9029]

Ok perfect, now it works fine :)

Thank you for your time!