{ "scale_type": "001", "serial_port": "/dev/ttyS1", "baud_rate": 9600, "mqtt": { "client_id": "weight_reader", "host": "112.33.111.160", "port": 1883, "username": "auseft", "password": "1q2w3E**", "keep_alive_secs": 5, "topic_prefix": "weight/data" } }