{
    "channels": [
        {
            "key":       "serial_ftu",
            "type":      "uart",
            "device":    "/dev/ttyS1",
            "baudrate":  115200,
            "data_bits": 8,
            "stop_bits": 1,
            "parity":    "N",
            "desc":      "FTU串口 — 帧内容分路 (ICP67 dev=0/IEC→转发源, dev=1→self_ptl)"
        },
        {
            "key":        "tcp_master",
            "type":       "tcp_server",
            "local_ip":   "0.0.0.0",
            "local_port": 2404,
            "desc":       "主站通道 (libiec直管, 不走com_router路由)"
        }
    ],
    "forward_rules": [
        {
            "listen_ip":     "0.0.0.0",
            "listen_port":   2405,
            "target_channel": "serial_ftu",
            "desc":           "维护软件直连FTU透传"
        }
    ]
}