После перезапуска mosquitto:
Apr 16 10:52:14 IQ170000 daemon.info wb-rules[1813]: INFO: [wbgo_mqtt] rules-IQ170000-1813: MQTT connection established
Apr 16 10:52:14 IQ170000 daemon.info wb-rules[1813]: WARNING: [wbgo_mqtt] MQTT connection lost
Apr 16 10:52:14 IQ170000 daemon.info wb-rules[1813]: INFO: [wbgo_mqtt] rules-IQ170000-1813: MQTT connection established
Apr 16 10:52:24 IQ170000 daemon.info wb-rules[1813]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.SubscribeToken (&{{{{0 0} 0 0 0 0} 0x1845500 false <nil>} [] map[]})
Apr 16 10:52:34 IQ170000 daemon.info wb-rules[1813]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.SubscribeToken (&{{{{0 0} 0 0 0 0} 0x1845540 false <nil>} [] map[]})
Apr 16 10:52:44 IQ170000 daemon.info wb-rules[1813]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.SubscribeToken (&{{{{0 0} 0 0 0 0} 0x1845580 false <nil>} [] map[]})
Apr 16 10:52:54 IQ170000 daemon.info wb-rules[1813]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.SubscribeToken (&{{{{0 0} 0 0 0 0} 0x18455c0 false <nil>} [/devices/+/meta/driver] map[]})
Apr 16 11:00:02 IQ170000 user.notice wb-daemon-watchdogs: wb-rules check failed, reload wb-rules
Apr 16 11:00:34 IQ170000 daemon.info wb-rules[11817]: INFO: driver is created
Apr 16 11:00:34 IQ170000 daemon.info wb-rules[11817]: INFO: [wbgo_mqtt] rules-IQ170000-11817: MQTT connection established
Apr 16 11:00:34 IQ170000 daemon.info wb-rules[11817]: INFO: driver loop is started
Apr 16 11:00:34 IQ170000 daemon.info wb-rules[11817]: INFO: wait for driver to become ready
Apr 16 11:00:36 IQ170000 daemon.info wb-rules[11817]: INFO: driver is ready
Apr 16 11:00:36 IQ170000 daemon.info wb-rules[11817]: INFO: [rule info] using file /var/lib/wirenboard/wbrules-persistent.db for persistent DB
Apr 16 11:00:36 IQ170000 daemon.info wb-rules[11817]: INFO: [wbgo_mqtt] wb-rules-engine-IQ170000-11817: MQTT connection established
Apr 16 11:00:36 IQ170000 daemon.info wb-rules[11817]: INFO: [engine] Starting main loop
Apr 16 11:00:36 IQ170000 daemon.info wb-rules[11817]: INFO: the engine is ready
В конечном счете wb-rules запустился сам, но 7 минут старта как-то очень долго. И аналогично wb-rules иногда запускается при загрузке контроллера.