MQTT persistence

Does anybody succeed to store state updates on MQTT topics?
I just followed the WiKi.
In my .cfg I have:

mqtt:octopus.url=ssl://<my-url>:8883
mqtt:octopus.clientId=rasp_test
mqtt:octopus.user=pippo
mqtt:octopus.pwd=pollo

mqtt-persistence:broker=octopus
mqtt-persistence:topic=hgm_andrea/feeds/andreacontent.
mqtt-persistence:message=%1$s,%2$s,%3$s,%4$s

But, on the MQTT broker logs, while I see state updates on mqtt transport topics, I do not see anything on hgm_andrea/feeds/andreacontent.