Пытаюсь воспроизвести.
Для этого сконфигурировал устройство но не поключал.
Вижу:
Dec 18 10:37:39 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:37:59 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:38:19 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:38:39 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:38:59 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:39:19 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:39:39 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:39:59 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:39:59 wirenboard-AC4U5OVN systemd[1]: Starting Cleanup of Temporary Directories...
Dec 18 10:39:59 wirenboard-AC4U5OVN systemd[1]: systemd-tmpfiles-clean.service: Succeeded.
Dec 18 10:39:59 wirenboard-AC4U5OVN systemd[1]: Finished Cleanup of Temporary Directories.
Dec 18 10:40:19 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:40:39 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:40:50 wirenboard-AC4U5OVN wb-device-manager[64909]: [WARNING] Can't get firmware info for slave id: 112, /dev/ttyRS485-1 9600 8N2: Request timeout [-32600]: Serial protocol error: request timed out
Dec 18 10:40:59 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:41:19 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:41:39 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:41:59 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Dec 18 10:42:19 wirenboard-AC4U5OVN wb-mqtt-serial[2426110]: WARNING: </dev/ttyRS485-1 9600 8 N 2>: closed due to repetitive errors
Одну попытку запроса.
Если устройство подключаю - то при смене его статуса на “подключенное” - еще одну попытку запроса, успешную.
В общем - проблема в том что устройство периодически перестает отвечать.