Modbus协议-MJK设备-获取设备ID从设备ID

如何解决Modbus协议-MJK设备-获取设备ID从设备ID

我需要通过TCP侦听器读取差异设备的寄存器值。

要获取寄存器的值，我们需要向具有设备ID的设备请求，在下面的代码中0xF7是硬编码的。

现在我们有500多个设备将连接到我们的端口，那么当它们连接到我们的TCP端口时，是否有任何方法来获取设备ID（slaveID）？

class PriceScreen extends StatefulWidget {
  @override
  PriceScreenState createState() => PriceScreenState();
}

class PriceScreenState extends State < PriceScreen > {
  String selectedCurrency = 'USD';
  String selectedGraphType = "1M";
  Map < String,String > coinValues = {};
  Map < String,double > graphValues = {};
 ***Future futureData;

  bool isWaiting = false;

  getData() async {
    isWaiting = true;
    try {
      Map coinData = await CoinData().getCoinData(selectedCurrency);
      Map graphData = await GraphData().getGraphData( 
        selectedCurrency: selectedCurrency,selectedGraphType: selectedGraphType);
      isWaiting = false;
      setState(() {
        coinValues = coinData;
        graphValues = graphData; 
      });
    } catch (e) {
      print(e);
    }
  }

  @override
  void initState() {
    super.initState();
 ***futureData = getData();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Crypto Watcher'),),body: ModalProgressHUD(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,crossAxisAlignment: CrossAxisAlignment.stretch,***child: FutureBuilder(
                future: futureData,builder: (context,snapshot) {
                  if (graphValues.isEmpty) {
                    return new Container();
                  } else
                    print(graphValues);
                  return Graph(closingTimesAndPrices: graphValues);
                }),inAsyncCall: isWaiting,progressIndicator: CircularProgressIndicator(
          backgroundColor: Colors.orange,);
  }
}