78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
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package main
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import (
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"log"
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"strconv"
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"time"
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"github.com/simonvetter/modbus"
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)
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var (
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tcp_server *modbus.ModbusServer
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rtu_client *modbus.ModbusClient
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Logger log.Logger = *log.Default()
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)
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const (
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SERVER = "[::]"
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PORT = 502
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SERIAL_INTERFACE = "/dev/ttyUSB0"
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BAUD = 9600
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)
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func init() {
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Logger.SetPrefix("modbus_bridge: ")
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Logger.Println("Starting")
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// create modbus tcp server
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timeout := 30 * time.Second
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var server_cfg = modbus.ServerConfiguration{
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URL: "tcp://" + SERVER + ":" + strconv.Itoa(PORT),
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Timeout: timeout,
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MaxClients: 5,
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}
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var err error
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handler := &modbusTcpHandler{}
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tcp_server, err = modbus.NewServer(&server_cfg, handler)
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if err != nil {
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Logger.Printf("failed to create server: %v\n", err)
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return
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}
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// create modbus rtu client
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url := "rtu://" + SERIAL_INTERFACE
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rtu_client, err = modbus.NewClient(&modbus.ClientConfiguration{
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URL: url,
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Speed: BAUD,
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DataBits: 8,
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Parity: modbus.PARITY_NONE,
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StopBits: 1,
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Timeout: 300 * time.Millisecond,
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})
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if err != nil {
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Logger.Printf("Could not create new modbus rtu client on %s (%s).", url, err.Error())
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err = modbus.ErrConfigurationError
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return
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}
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err = rtu_client.Open()
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if err != nil {
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Logger.Printf("Could not open new modbus rtu client on %s (%s).", url, err.Error())
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err = modbus.ErrConfigurationError
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return
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}
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}
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func main() {
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if tcp_server != nil {
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Logger.Print("Starting modbus tcp server")
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err := tcp_server.Start()
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if err != nil {
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Logger.Printf("Unable to start modbus tcp server: %s", err.Error())
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}
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}
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for {
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time.Sleep(time.Millisecond * 500)
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}
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}
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