Получилось воспроизвести у себя.
May 26 12:58:06 wirenboard-AGH767IU wb-rules[18877]: INFO: reloading file: /etc/wb-rules/04_temperature.js
May 26 12:58:06 wirenboard-AGH767IU wb-mqtt-db[2810]: WARNING: [conventions] converting empty value to boolean "false"
May 26 12:58:17 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d0d80 <nil>} 1993})
May 26 12:58:27 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d0e40 <nil>} 1994})
May 26 12:58:28 wirenboard-AGH767IU wb-mqtt-serial[9776]: WARNING: [modbus] failed to read 1 input(s) @ 121 of device </dev/ttyRS485-2 115200 8 N 2> modbus:98: Serial protocol error: malformed response: invalid crc
May 26 12:58:37 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d0f00 <nil>} 1995})
May 26 12:58:47 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d1080 <nil>} 1996})
May 26 12:58:47 wirenboard-AGH767IU mosquitto[4861]: 1748264327: Client rules-wirenboard-AGH767IU-18877 disconnected: Broken pipe.
May 26 12:58:57 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d1180 <nil>} 1997})
May 26 12:59:07 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d1540 <nil>} 1998})
May 26 12:59:17 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d16c0 <nil>} 1999})
May 26 12:59:27 wirenboard-AGH767IU wb-rules[18877]: ERROR: [wbgo_mqtt] MQTT token wait timeout: *mqtt.PublishToken (&{{{{0 0} 0 0 {{} 0} {{} 0}} 0x15d1740 <nil>} 2000})