coatyio/coaty-examples

A set of fully documented code examples that demonstrate best practices and typical usage patterns for Coaty applications.

coaty-examples's Issues

Connection to DB

I tried to run the hello-world example (js) as specified in the README.md on my windows 10 laptop. I installed PostgreSQL 11 with the default username and password. The example runs as expected; however, I can't see the newly created DB (DB_NAME = "helloworld_db") on PGAdmin 4 UI nor on the SQL shell. I added shouldPersistLocalSnapshots: true; to the HistorianController and added the port on functions: getConnectionString() and getAdminConnectionString() (following this link) but still, the DB doesn't seem to be created.
My question is: do you have any idea why the DB is not created?

Discovering advertised Things

Affected example
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Is your feature request related to a problem? Please describe.
I am using the example to create i) Things that advertise their description and observations and ii) a consumer agent that discovers advertised Things.
If I assume a situation where Things are running first, then the consumer agent is switched on, it can't detect already advertised Things.
Also, if I assume both Things and consumer agents are switched on, then one of the Things goes off and on again, the consumer agent considers it as a new sensor since it has a new UUID.

Describe the solution you'd like
Ideally, the consumer agent should keep track of newly registered Things, previously registered Things, and Things that are deregistered in order to have an updated status of Things available in the specific context at all times.

Describe alternatives you've considered
I used the sensor-things-controller.ts for creating Things
In the consumer agent, I used

this.registeredSensorsChangeInfo$.subscribe(changeInfo => {
            // changeInfo.added.forEach(sensor => this._dbCtx.insertObjects(Db.COLLECTION_SENSOR, sensor, true));
            // changeInfo.added.forEach(sensor => this._dbCtx.insertObjects(Db.COLLECTION_THING, sensor["thing"] as Thing, true));
            changeInfo.changed.forEach(sensor => console.log("changed Thing: ", sensor["thing"] as Thing));
            changeInfo.added.forEach(sensor => console.log("New Thing: ", sensor["thing"] as Thing));
            changeInfo.removed.forEach(sensor => console.log("Removed Thing:  ", sensor["thing"] as Thing));
        });

But this doesn't seem to solve it.