[Backlogmanager] [FIWARE-JIRA] (HELP-21086) [fiware-stackoverflow] Fail subscription to Orion change contest from Node Server

[Fernando Lopez (JIRA)]

     [ https://jira.fiware.org/browse/HELP-21086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fernando Lopez deleted HELP-21086:
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> [fiware-stackoverflow] Fail subscription to Orion change contest from Node Server
> ---------------------------------------------------------------------------------
>
>                 Key: HELP-21086
>                 URL: https://jira.fiware.org/browse/HELP-21086
>             Project: Help-Desk
>          Issue Type: Monitor
>            Reporter: Backlog Manager
>              Labels: fiware, fiware-orion, node.js, request, server
>
> Created question in FIWARE Q/A platform on 25-03-2023 at 16:03
> {color: red}Please, ANSWER this question AT{color} https://stackoverflow.com/questions/75843013/fail-subscription-to-orion-change-contest-from-node-server
> +Question:+
> Fail subscription to Orion change contest from Node Server
> +Description:+
> I am developing a simple project in which I made a list of entities that I put on Orion-LD. Now I would like to make a server that allows to receive notifications whenever the state of an entity attribute changes. i chose to use Node.JS Express for ease but it is not mandatory.
> I am leaving here the simple code used to implement my server.
> const express = require('express');
> const request = require('request');
> const app = express();
> const PORT = 3000;
> //Subscription on batteryLevel changes of device 9845A
> app.get('/subscribe', (req, res) => {
>     const data = {
>         "description": "Subscription",
>         "subject": {
>             "entities": [
>                 {
>                     "id": "urn:ngsi-ld:Device:9845A",
>                     "type": "Device"
>                 }
>             ],
>             "condition": {
>                 "attrs": ["batteryLevel"]
>             }
>         },
>         "notification": {
>             "http": {
>                 "url": `http://localhost:${PORT}/notification`
>             },
>             "attrsFormat" : "keyValues"
>         }
>     };
>       
>     const options = {
>         headers: {
>             'Content-Type': 'application/json',
>           },
>         json: data
>     };
>     request.post('http://localhost:1026/v2/subscriptions', options, (error, response, request) => {
>         console.log(response.body);
>         res.end("Succesfully subscribed!");
>     });
> });
> // Listen on notification
> app.post('/notification', (req, res) => {
>     console.log('Notification received:', req.body);
>     res.sendStatus(200);
> });
> app.listen(PORT, () => {
>   console.log(`Example app listening on port ${PORT}`)
> });
> The problem is that if I subscribe to an existing entity properly, it reports a "status": "failed" in the subscription and therefore I cannot receive notifications about the status. Reading the Orion LD logs, it seems that it can't communicate with my server at port 3000, but I can't figure out why. Can anyone help me with this?



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