Sng Crest Device Simulator

The simulator acts as a coap device, sends alarm messages and is able to handling a PSK set command.

Flow

1. The simulator sends a coap alarm message to the coap-http proxy, from a while(true) loop in a separate virtual thread, started from the Simulator.kt class, that extends CommandLineRunner.
2. If the response received contains a PSK:SET command, then:
   1. Handle the PSK change:
      1. The new key is saved with status PENDING.
      2. Send a success message.
      3. The pending key gets status ACTIVE and the previous active key gets status INACTIVE.
   2. If an error occurs during the PSK change handling:
      1. Send a failure message.
      2. If a pending key was already saved, set the status of this key as INVALID.
   3. The thread sleeps for simulatorProperties.sleepDuration seconds and then the flow starts again.