That's done the trick, at least in terms of getting a logfile that isn't gibberish
I believe this is the relevant bit
Code:
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Read TCP packet: [5, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Calibre Opcode received: 5
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Processing FREE_SPACE packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Wrote TCP packet: 40[0,{"free_space_on_device":25799557120
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:48 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:27:50 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:50 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:27:50 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:50 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:27:52 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:52 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:27:52 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:52 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:27:54 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:54 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:27:54 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:54 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:27:56 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:56 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:27:56 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:56 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:27:58 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:27:58 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:27:58 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:27:58 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:28:08 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:28:08 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:28:08 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:28:08 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:28:18 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:28:18 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:28:18 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:28:18 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:28:29 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:28:29 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:28:29 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:28:29 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:28:42 [DEBUG] Read TCP packet: [12, {}]
[Kobo-UNCaGED] 2020/12/17 01:28:42 [DEBUG] Calibre Opcode received: 12
[Kobo-UNCaGED] 2020/12/17 01:28:42 [DEBUG] Processing NOOP packet: {}
[Kobo-UNCaGED] 2020/12/17 01:28:42 [DEBUG] Wrote TCP packet: 6[0,{}]
[Kobo-UNCaGED] 2020/12/17 01:28:57 Start: packet reading failed: readDecodeCalibrePayload: connection closed: readTCP: connection timed out: read tcp 192.168.1.117:44818->192.168.1.248:9090: i/o timeout
[Kobo-UNCaGED] 2020/12/17 01:28:57 Start: packet reading failed: readDecodeCalibrePayload: connection closed: readTCP: connection timed out: read tcp 192.168.1.117:44818->192.168.1.248:9090: i/o timeout
Dec 17 01:28:57 [Kobo-UNCaGED] Running precautionary library rescan
Dec 17 01:29:02 [Kobo-UNCaGED] Disabled loopback interface
If you need more let me know, interestingly no mention of any book either on my Kobo or in my Calibre library is in the log.