111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
package provider
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import (
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"math"
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"github.com/andig/evcc/provider/modbus"
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"github.com/andig/evcc/util"
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"github.com/volkszaehler/mbmd/meters"
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"github.com/volkszaehler/mbmd/meters/rs485"
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"github.com/volkszaehler/mbmd/meters/sunspec"
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)
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// Modbus implements modbus RTU and TCP access
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type Modbus struct {
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log *util.Logger
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conn meters.Connection
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device meters.Device
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slaveID uint8
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op rs485.Operation
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}
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type ModbusSettings struct {
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Model string
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modbus.Connection `mapstructure:",squash"`
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}
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// NewModbusFromConfig creates Modbus plugin
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func NewModbusFromConfig(log *util.Logger, typ string, other map[string]interface{}) *Modbus {
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cc := struct {
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ModbusSettings `mapstructure:",squash"`
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Value string
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}{}
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util.DecodeOther(log, other, &cc)
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// assume RTU if not set and this is a known RS485 meter model
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if cc.RTU == nil {
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b := modbus.IsRS485(cc.Model)
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cc.RTU = &b
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}
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conn := modbus.NewConnection(log, cc.URI, cc.Device, cc.Comset, cc.Baudrate, *cc.RTU)
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device, err := modbus.NewDevice(log, cc.Model, *cc.RTU)
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log = util.NewLogger("modb")
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conn.Logger(log.TRACE)
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// prepare device
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if err == nil {
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conn.Slave(cc.ID)
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err = device.Initialize(conn.ModbusClient())
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// silence Kostal implementation errors
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if _, partial := err.(meters.SunSpecPartiallyInitialized); partial {
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err = nil
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}
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}
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if err != nil {
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log.FATAL.Fatal(err)
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}
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measurement, err := meters.MeasurementString(cc.Value)
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if err != nil {
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log.FATAL.Fatalf("invalid measurement %s", cc.Value)
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}
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// for RS485 check if producer supports the measurement
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op := rs485.Operation{IEC61850: measurement}
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if dev, ok := device.(*rs485.RS485); ok {
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op = modbus.RS485FindDeviceOp(dev, measurement)
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if op.IEC61850 == 0 {
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log.FATAL.Fatalf("unsupported measurement value: %s", measurement)
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}
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}
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return &Modbus{
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log: log,
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conn: conn,
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device: device,
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op: op,
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slaveID: cc.ID,
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}
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}
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// FloatGetter executes configured modbus read operation and implements provider.FloatGetter
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func (m *Modbus) FloatGetter() (float64, error) {
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m.conn.Slave(m.slaveID)
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var res meters.MeasurementResult
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var err error
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if dev, ok := m.device.(*rs485.RS485); ok {
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res, err = dev.QueryOp(m.conn.ModbusClient(), m.op)
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}
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if dev, ok := m.device.(*sunspec.SunSpec); ok {
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res, err = dev.QueryOp(m.conn.ModbusClient(), m.op.IEC61850)
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}
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if err == nil {
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m.log.TRACE.Printf("%+v", res)
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}
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return res.Value, err
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}
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// IntGetter executes configured modbus read operation and implements provider.IntGetter
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func (m *Modbus) IntGetter() (int64, error) {
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res, err := m.FloatGetter()
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return int64(math.Round(res)), err
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}
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