Fix agent reconnect does not work

[GabyUnalaq]

Issues: #39

Solution

When the agent gets disconnected, the sdk enters a routine where it tries to send the hello message over and over. Succeeding in sending it means the agent is back. The agent will receive a number of hello messages when starting, but this is ok because the first one will be taken into account (and much needed by the whole interaction) and the rest of them will be ignored, thus the communication can continue.

Definition of Done

The PR shall be merged only if all items mentioned in CONTRIBUTING.md have been followed. In case an item is not applicable as described, please provide a short explanation in the description.

• All steps in CONTRIBUTING.md have been handled

[krucod3]

Looks good, just had a couple of small findings.
I have not tested it yet, but I'll do so and we can merge after the fixes and the test.

[krucod3]

All done here. The handling also works, but the documentation of the exceptions needs to be updated. As this is out of the scope of the current ticket, I created a new one: #47