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Companion device for perinode-modbusbridge

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Signed-off-by: Thomas Klaehn <thomas.klaehn@perinet.io>
This commit is contained in:
Thomas Klaehn
2025-01-21 15:35:44 +01:00
parent 6d9b0da10a
commit db50b3271a
6 changed files with 28 additions and 226 deletions
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2
.vscode/launch.json vendored
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@@ -10,7 +10,7 @@
"request": "launch",
"mode": "auto",
"program": "${fileDirname}",
"args": ["-c", "/etc/powercollect/config.json"]
// "args": ["-c", "/etc/powercollect/config.json"]
}
]
}

2
config/config.json
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@@ -1,7 +1,7 @@
{
"rtu_address": 1,
"sample_rate": 10,
"modbus_host": "wels.local",
"modbus_host": "periCORE-i7dv5.local",
"modbus_port": 502,
"influxdb_host": "barsch.local",
"influxdb_port": 8086,

15
go.mod
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@@ -2,17 +2,6 @@ module powercollect
go 1.19
require (
actshad.dev/modbus v0.2.0
github.com/influxdata/influxdb-client-go/v2 v2.12.0
)
require actshad.dev/modbus v0.2.0
require (
github.com/apapsch/go-jsonmerge/v2 v2.0.0 // indirect
github.com/deepmap/oapi-codegen v1.12.2 // indirect
github.com/goburrow/serial v0.1.0 // indirect
github.com/google/uuid v1.3.0 // indirect
github.com/influxdata/line-protocol v0.0.0-20210922203350-b1ad95c89adf // indirect
github.com/pkg/errors v0.9.1 // indirect
golang.org/x/net v0.1.0 // indirect
)
require github.com/goburrow/serial v0.1.0 // indirect

26
go.sum
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@@ -1,30 +1,4 @@
actshad.dev/modbus v0.2.0 h1:saCi1iAZOHlmhDiFAY2a8fjouS63mWQVoVVhitEkFFQ=
actshad.dev/modbus v0.2.0/go.mod h1:8IHuLxLYjoX4NomWdAJkEOsAVJnncMAoppE7wRlIYME=
github.com/RaveNoX/go-jsoncommentstrip v1.0.0/go.mod h1:78ihd09MekBnJnxpICcwzCMzGrKSKYe4AqU6PDYYpjk=
github.com/apapsch/go-jsonmerge/v2 v2.0.0 h1:axGnT1gRIfimI7gJifB699GoE/oq+F2MU7Dml6nw9rQ=
github.com/apapsch/go-jsonmerge/v2 v2.0.0/go.mod h1:lvDnEdqiQrp0O42VQGgmlKpxL1AP2+08jFMw88y4klk=
github.com/bmatcuk/doublestar v1.1.1/go.mod h1:UD6OnuiIn0yFxxA2le/rnRU1G4RaI4UvFv1sNto9p6w=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/deepmap/oapi-codegen v1.12.2 h1:F7SMEn0UMpJV6kWwDYqfDmnnOYHIcU7ETV8qTVFdyI0=
github.com/deepmap/oapi-codegen v1.12.2/go.mod h1:ao2aFwsl/muMHbez870+KelJ1yusV01RznwAFFrVjDc=
github.com/goburrow/serial v0.1.0 h1:v2T1SQa/dlUqQiYIT8+Cu7YolfqAi3K96UmhwYyuSrA=
github.com/goburrow/serial v0.1.0/go.mod h1:sAiqG0nRVswsm1C97xsttiYCzSLBmUZ/VSlVLZJ8haA=
github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/influxdata/influxdb-client-go/v2 v2.12.0 h1:LGct9uIp36IT+8RAJdmJGQbNonGi26YfYYSpDIyq8fI=
github.com/influxdata/influxdb-client-go/v2 v2.12.0/go.mod h1:YteV91FiQxRdccyJ2cHvj2f/5sq4y4Njqu1fQzsQCOU=
github.com/influxdata/line-protocol v0.0.0-20210922203350-b1ad95c89adf h1:7JTmneyiNEwVBOHSjoMxiWAqB992atOeepeFYegn5RU=
github.com/influxdata/line-protocol v0.0.0-20210922203350-b1ad95c89adf/go.mod h1:xaLFMmpvUxqXtVkUJfg9QmT88cDaCJ3ZKgdZ78oO8Qo=
github.com/juju/gnuflag v0.0.0-20171113085948-2ce1bb71843d/go.mod h1:2PavIy+JPciBPrBUjwbNvtwB6RQlve+hkpll6QSNmOE=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/spkg/bom v0.0.0-20160624110644-59b7046e48ad/go.mod h1:qLr4V1qq6nMqFKkMo8ZTx3f+BZEkzsRUY10Xsm2mwU0=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
golang.org/x/net v0.1.0 h1:hZ/3BUoy5aId7sCpA/Tc5lt8DkFgdVS2onTpJsZ/fl0=
golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

118
main.go
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@@ -1,16 +1,15 @@
package main
import (
"context"
"encoding/json"
"flag"
"log"
"math"
"os"
"strconv"
"sync"
"time"
influxdb2 "github.com/influxdata/influxdb-client-go/v2"
"actshad.dev/modbus"
)
type sdm630Register struct {
@@ -18,16 +17,6 @@ type sdm630Register struct {
Unit string
}
type measure struct {
Value float32 `json:"value"`
Unit string `json:"unit"`
}
type sampleCache struct {
sample map[string]measure
mutex sync.Mutex
}
type config struct {
RtuAddress int `json:"rtu_address"`
SampleRate int `json:"sample_rate"`
@@ -57,11 +46,9 @@ var (
"TotalExport": {0x4A, "kWh"},
}
logger log.Logger = *log.Default()
last_total_import float32 = 0.0
last_total_export float32 = 0.0
config_path string
config_cache = config{
logger log.Logger = *log.Default()
config_path string
config_cache = config{
RtuAddress: 1, // modbus device slave address (0x01)
SampleRate: 1, // sec
ModbusHost: "", // hostname of the modbus tcp to rtu bridge
@@ -86,45 +73,8 @@ func read_config() {
}
func init() {
logger.SetPrefix("PowerMeterSDM630: ")
logger.SetFlags(log.Llongfile | log.Ltime)
logger.Println("Starting")
}
func sample_is_valid(sample map[string]measure) bool {
if len(sample) == 0 {
logger.Print("Sample invalid - contains no data")
return false
}
result := float32(0.0)
// sample is invalid when all values equals 0.0
for _, value := range sample {
result += value.Value
}
if result == 0.0 {
logger.Print("Sample invalid - all values equals 0.0")
return false
}
// total import and total export can never decrease
for key, value := range sample {
if key == "TotalImport" {
if value.Value < last_total_import {
logger.Printf("Sample invalid - Total import lower than previous one (%f vs. %f)", value.Value, last_total_import)
return false
}
last_total_import = value.Value
}
if key == "TotalExport" {
if value.Value < last_total_export {
logger.Printf("Sample invalid - Total export lower than previous one (%f vs. %f)", value.Value, last_total_export)
return false
}
last_total_export = value.Value
}
}
return true
}
func main() {
@@ -132,50 +82,30 @@ func main() {
flag.Parse()
read_config()
go keep_mbus_connection()
go collect_mbus_samples()
tmp := config_cache.ModbusHost + ":" + strconv.Itoa(config_cache.ModbusPort)
handler := modbus.NewTCPClientHandler(tmp)
// handler.Timeout = 500 * time.Millisecond
handler.Timeout = 500 * time.Second
handler.SlaveId = byte(config_cache.RtuAddress)
influxdb_url := "http://" + config_cache.InfluxdbHost + ":" + strconv.Itoa(config_cache.InfluxdbPort)
client := influxdb2.NewClient(influxdb_url, config_cache.InfluxdbToken)
// always close client at the end
defer client.Close()
// get non-blocking write client
writeAPI := client.WriteAPIBlocking("tkl", "home")
ctx := context.Background()
err := handler.Connect()
if err != nil {
logger.Panic(err)
}
defer handler.Close()
modbus_client := modbus.NewClient(handler)
for {
time.Sleep(time.Duration(config_cache.SampleRate * 1000000000))
sample_cache.mutex.Lock()
sample := sample_cache.sample
sample_cache.mutex.Unlock()
if sample_is_valid(sample) {
point := influxdb2.NewPointWithMeasurement("power")
point.AddTag("sensor", "powermeter")
for key, value := range sample {
point.AddField(key, value.Value)
point.AddField("unit", value.Unit)
}
// calculate TotalPowerW
total_power := sample["L1PowerW"].Value + sample["L2PowerW"].Value + sample["L3PowerW"].Value
point.AddField("TotalPowerW", total_power)
point.AddField("unit", "W")
point.SetTime(time.Now())
err := writeAPI.WritePoint(ctx, point)
for key, register := range sdm_registers {
res, err := modbus_client.ReadInputRegisters(register.Address, 2)
if err != nil {
logger.Print(err.Error())
continue
}
err = writeAPI.Flush(ctx)
if err != nil {
logger.Print(err.Error())
logger.Printf("Could not read from %s (%s)", key, err)
continue
}
var ieee754 uint32 = (uint32(res[0])<<24 + (uint32(res[1]) << 16) + (uint32(res[2]) << 8) + uint32(res[3]))
result := math.Float32frombits(ieee754)
logger.Printf("%s: %f %s\n", key, result, register.Unit)
}
time.Sleep(time.Second)
}
}

91
modbus.go
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@@ -1,91 +0,0 @@
package main
import (
"math"
"strconv"
"time"
"actshad.dev/modbus"
)
var (
modbus_client modbus.Client
sample_cache sampleCache
)
func modbus_is_connected() bool {
return modbus_client != nil
}
// Read modbus register and convert result into float
func modbus_read_float_register(register_address uint16) (float32, error) {
var result float32 = 0.0
if modbus_client != nil {
res, err := modbus_client.ReadInputRegisters(register_address, 2)
if err != nil {
logger.Print("Modbus connection lost")
modbus_client = nil
return 0.0, err
}
var ieee754 uint32 = (uint32(res[0])<<24 + (uint32(res[1]) << 16) + (uint32(res[2]) << 8) + uint32(res[3]))
result = math.Float32frombits(ieee754)
}
return result, nil
}
// Connect to modbus tcp bridge
func modbus_connect(host string, port uint, slave_id byte) error {
connection := host + ":" + strconv.FormatUint(uint64(port), 10)
handler := modbus.NewTCPClientHandler(connection)
handler.Timeout = 10 * time.Second
handler.SlaveId = slave_id
err := handler.Connect()
if err != nil {
logger.Print(err)
return err
}
logger.Print("Modbus connected")
defer handler.Close()
modbus_client = modbus.NewClient(handler)
return nil
}
// connect to modbus tcp bridge host. If connection is lost try to re-connect.
func keep_mbus_connection() {
for { // ever
time.Sleep(time.Second)
if !modbus_is_connected() {
modbus_connect(config_cache.ModbusHost,
uint(config_cache.ModbusPort),
byte(config_cache.RtuAddress),
)
}
}
}
// Collect data of SDM-630 power meter
func collect_mbus_samples() {
for { // ever
if modbus_is_connected() {
sample := make(map[string]measure)
for key, register := range sdm_registers {
res, err := modbus_read_float_register(register.Address)
if err != nil {
logger.Printf("Could not read from %s (%s)", key, err)
continue
}
var mes measure
mes.Value = res
mes.Unit = register.Unit
sample[key] = mes
}
sample_cache.mutex.Lock()
sample_cache.sample = sample
sample_cache.mutex.Unlock()
}
time.Sleep(time.Duration(config_cache.SampleRate * 1000000000))
}
}