- fix re-connection after connection loss to broker

- add subscribe call after reconnect
  - additional config settings for timeout values
- add more info/warn outputs
- change default log level from "warn" to "info"

rpicontrol.config.example

@@ -1,5 +1,8 @@
 mqtt-config:
-  broker-address: "tcp://nuc.fritz.box:1883"
+  broker-address: "tcp://localhost:1883"
+  connect-timeout-ms: 2000
+  connect-retry-interval-ms: 2000
+  max-reconnect-interval-ms: 15000
 
 pin-control-config:
   gpio-pins: