Tests with simulated devices

[fabianabarca]

Description

Fixtures and integration tests.

Acceptance Criteria

• Simulated device fixtures
• Integration tests with reconnects
• CI passing

[fabianabarca]

Tracked in #1

[gonguma]

Starts: 2025-11-17
Ends: 2025-11-22
Depends on: #2 #3 #4 and #6. Simulated device tests require all key components to be in place since they need to simulate how devices connect, send, and receive messages.