Log that the plugin checks firmware ~every minute
Looking at my logs, I see the plugin check the firmware version every minute or so. 

Logs:
`[24/01/2021, 11:36:31] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:38:11] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:39:12] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:40:17] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:41:22] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:42:27] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:43:32] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:44:35] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:45:44] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116
[24/01/2021, 11:46:53] [Roborock S4 Max] INF getFirmware | roborock.vacuum.a19 | Firmwareversion is 4.1.2_0116`

My config:
`"name": "Roborock S4 Max",
"IP": "[IP removed]",
            "token": "[TOKEN removed]",
            "waterBox": false,
            "silent": false,
            "pause": true,
            "pauseWord": "Pause",
            "findMe": true,
            "findMeWord": "Where are you",
            "dock": true,
            "delay": false,
            "cleanword": "Clean",
            "roomTimeout": 0,
            "autoroom": false,
            "accessory": "XiaomiRoborockVacuum"`