They look like regular OZW logs to me. The biggest one (@ ~21M) is just under 250,000 lines.
here is a sample:
2019-06-27 12:03:39.050 Always, OpenZwave Version 1.4.3440 Starting Up
2019-06-27 12:03:59.853 Info, Setting Up Provided Network Key for Secure Communications
2019-06-27 12:03:59.853 Info, mgr, Added driver for controller /dev/ttyUSB-ZStick-5G
2019-06-27 12:03:59.856 Info, Opening controller /dev/ttyUSB-ZStick-5G
2019-06-27 12:03:59.856 Info, Trying to open serial port /dev/ttyUSB-ZStick-5G (attempt 1)
2019-06-27 12:03:59.856 Info, Serial port /dev/ttyUSB-ZStick-5G opened (attempt 1)
2019-06-27 12:03:59.856 Detail, contrlr, Queuing (Command) FUNC_ID_ZW_GET_VERSION: 0x01, 0x03, 0x00, 0x15, 0xe9
2019-06-27 12:03:59.857 Detail, contrlr, Queuing (Command) FUNC_ID_ZW_MEMORY_GET_ID: 0x01, 0x03, 0x00, 0x20, 0xdc
2019-06-27 12:03:59.857 Detail, contrlr, Queuing (Command) FUNC_ID_ZW_GET_CONTROLLER_CAPABILITIES: 0x01, 0x03, 0x00, 0x05, 0xf9
2019-06-27 12:03:59.857 Detail, contrlr, Queuing (Command) FUNC_ID_SERIAL_API_GET_CAPABILITIES: 0x01, 0x03, 0x00, 0x07, 0xfb
2019-06-27 12:03:59.857 Detail, contrlr, Queuing (Command) FUNC_ID_ZW_GET_SUC_NODE_ID: 0x01, 0x03, 0x00, 0x56, 0xaa
2019-06-27 12:03:59.857 Detail,
2019-06-27 12:03:59.857 Info, contrlr, Sending (Command) message (Callback ID=0x00, Expected Reply=0x15) - FUNC_ID_ZW_GET_VERSION: 0x01, 0x03, 0x00, 0x15, 0xe9
2019-06-27 12:03:59.859 Detail, contrlr, Received: 0x01, 0x10, 0x01, 0x15, 0x5a, 0x2d, 0x57, 0x61, 0x76, 0x65, 0x20, 0x33, 0x2e, 0x39, 0x35, 0x00, 0x01, 0x99
2019-06-27 12:03:59.859 Detail,
2019-06-27 12:03:59.859 Info, contrlr, Received reply to FUNC_ID_ZW_GET_VERSION:
2019-06-27 12:03:59.859 Info, contrlr, Static Controller library, version Z-Wave 3.95
2019-06-27 12:03:59.859 Detail, Node045, Expected reply was received
2019-06-27 12:03:59.859 Detail, Node045, Message transaction complete
2019-06-27 12:03:59.859 Detail,
2019-06-27 12:03:59.859 Detail, contrlr, Removing current message
2019-06-27 12:03:59.859 Detail,
2019-06-27 12:03:59.859 Info, contrlr, Sending (Command) message (Callback ID=0x00, Expected Reply=0x20) - FUNC_ID_ZW_MEMORY_GET_ID: 0x01, 0x03, 0x00, 0x20, 0xdc
2019-06-27 12:03:59.861 Detail, contrlr, Received: 0x01, 0x08, 0x01, 0x20, 0xec, 0xbe, 0xf3, 0x44, 0x01, 0x32
2019-06-27 12:03:59.861 Detail,
2019-06-27 12:03:59.861 Info, contrlr, Received reply to FUNC_ID_ZW_MEMORY_GET_ID. Home ID = 0xecbef344. Our node ID = 1
2019-06-27 12:03:59.861 Detail, Node190, Expected reply was received
2019-06-27 12:03:59.861 Detail, Node190, Message transaction complete
2019-06-27 12:03:59.861 Detail,
2019-06-27 12:03:59.861 Detail, contrlr, Removing current message
2019-06-27 12:03:59.861 Detail,
2019-06-27 12:03:59.861 Info, contrlr, Sending (Command) message (Callback ID=0x00, Expected Reply=0x05) - FUNC_ID_ZW_GET_CONTROLLER_CAPABILITIES: 0x01, 0x03, 0x00, 0x05, 0xf9
2019-06-27 12:03:59.863 Detail, contrlr, Received: 0x01, 0x04, 0x01, 0x05, 0x08, 0xf7
2019-06-27 12:03:59.863 Detail,
2019-06-27 12:03:59.863 Info, contrlr, Received reply to FUNC_ID_ZW_GET_CONTROLLER_CAPABILITIES:
2019-06-27 12:03:59.863 Info, contrlr, There is no SUC ID Server (SIS) in this network.
2019-06-27 12:03:59.863 Info, contrlr, The PC controller is a primary controller.
2019-06-27 12:03:59.863 Detail, Node247, Expected reply was received
2019-06-27 12:03:59.863 Detail, Node247, Message transaction complete
2019-06-27 12:03:59.864 Detail,
2019-06-27 12:03:59.864 Detail, contrlr, Removing current message
2019-06-27 12:03:59.864 Detail,
2019-06-27 12:03:59.864 Info, contrlr, Sending (Command) message (Callback ID=0x00, Expected Reply=0x07) - FUNC_ID_SERIAL_API_GET_CAPABILITIES: 0x01, 0x03, 0x00, 0x07, 0xfb
2019-06-27 12:03:59.868 Detail, contrlr, Received: 0x01, 0x2b, 0x01, 0x07, 0x01, 0x00, 0x00, 0x86, 0x01, 0x01, 0x00, 0x5a, 0xfe, 0x81, 0xff, 0x88, 0x4f, 0x1f, 0x00, 0x00, 0xfb, 0x9f, 0x7d, 0xa0, 0x67, 0x00, 0x00, 0x80, 0x00, 0x80, 0x86, 0x00, 0x00, 0x00, 0xe8, 0x73, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x60, 0x00, 0x00, 0xfa
2019-06-27 12:03:59.868 Detail,
2019-06-27 12:03:59.868 Info, contrlr, Received reply to FUNC_ID_SERIAL_API_GET_CAPABILITIES
2019-06-27 12:03:59.868 Info, contrlr, Serial API Version: 1.0
2019-06-27 12:03:59.868 Info, contrlr, Manufacturer ID: 0x0086
2019-06-27 12:03:59.868 Info, contrlr, Product Type: 0x0101
2019-06-27 12:03:59.868 Info, contrlr, Product ID: 0x005a
2019-06-27 12:03:59.868 Detail, contrlr, Queuing (Command) FUNC_ID_ZW_GET_RANDOM: 0x01, 0x04, 0x00, 0x1c, 0x20, 0xc7
2019-06-27 12:03:59.868 Detail, contrlr, Queuing (Command) FUNC_ID_SERIAL_API_GET_INIT_DATA: 0x01, 0x03, 0x00, 0x02, 0xfe
2019-06-27 12:03:59.868 Detail, contrlr, Queuing (Command) FUNC_ID_SERIAL_API_SET_TIMEOUTS: 0x01, 0x05, 0x00, 0x06, 0x64, 0x0f, 0x97
2019-06-27 12:03:59.868 Detail, contrlr, Queuing (Command) FUNC_ID_SERIAL_API_APPL_NODE_INFORMATION: 0x01, 0x07, 0x00, 0x03, 0x01, 0x02, 0x01, 0x00, 0xf9
2019-06-27 12:03:59.868 Detail, Expected reply was received
2019-06-27 12:03:59.868 Detail, Message transaction complete