Demonstrate MQTT based subscriptions with Scorpio

[wagmarcel]

Deprioritize MQTT
Task: Create Bats E2E tests for the additional scorpio modules (subscription, registry of context provider)

[wagmarcel]

HTTP POST does work now
MQTT? TBD next step

[wagmarcel]

MQTT with PAHO - seems to have dependency issue with Scorpio. @MericFeyz please take a look.

[yshashix]

• open issue on Scorpio github repo to get direction where could be problem

[wagmarcel]

Last release of Scorpio, 3.0.8 claims to have fixed MQTT issue, but we have still the PAHO problem

[yshashix]

-issue opened in Scorpio github about MQTT subscriptions and update https://github.com/ScorpioBroker/ScorpioBroker/issues/387

[wagmarcel]

Will work with version 4.0.3? @MericFeyz please check it out.

[wagmarcel]

4.1.5 shows problems with Kafka serialization
4.1.6 seems to fix the problems
4.1.6 with keycloak rebased from Scorpio 3.0.11
Tests are currently running - PR expected beginning next week

[wagmarcel]

Tried out Vanilla Scorpio version: 4.0.3 but configured for Kafka and Postgres

• Creation and retrieving simple test entity works
• Batch creation does not work (we do not care at this point)
• Subscription with MQTT/HTTP? If it works then we need to review/escalate batch data handling problem.
• Assume we find out that batch processing does not work - we would create a simple example and create and issue in Scorpio to let them know.