Reconnection logic

[jordeu]

• Heartbeat every 45 seconds
• First non-blocking reconnect after 2 seconds.

[pditommaso]

Is it not worth to add config setting for this? Env variable or java sys property should be fine

[jordeu]

I've added the micronaut way, with a @Value and a env var. I was a bit sceptical to make it work with GraalVM binary... but it is working! (I had lot's of problems with the injects when doing the first version).