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main.go
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main.go
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/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"encoding/binary"
"fmt"
"net"
"os"
"strconv"
"strings"
"github.com/dmichael/go-multicast/multicast"
"github.com/godbus/dbus/introspect"
"github.com/godbus/dbus/v5"
log "github.com/sirupsen/logrus"
)
const (
address = "239.12.255.254:9522"
)
var conn, err = dbus.SystemBus()
type singlePhase struct {
voltage float32 // Volts: 230,0
a float32 // Amps: 8,3
power float32 // Watts: 1909
forward float64 // kWh, purchased power
reverse float64 // kWh, sold power
}
const intro = `
<node>
<interface name="com.victronenergy.BusItem">
<signal name="PropertiesChanged">
<arg type="a{sv}" name="properties" />
</signal>
<method name="SetValue">
<arg direction="in" type="v" name="value" />
<arg direction="out" type="i" />
</method>
<method name="GetText">
<arg direction="out" type="s" />
</method>
<method name="GetValue">
<arg direction="out" type="v" />
</method>
</interface>` + introspect.IntrospectDataString + `</node> `
type objectpath string
var victronValues = map[int]map[objectpath]dbus.Variant{
// 0: This will be used to store the VALUE variant
0: map[objectpath]dbus.Variant{},
// 1: This will be used to store the STRING variant
1: map[objectpath]dbus.Variant{},
}
func (f objectpath) GetValue() (dbus.Variant, *dbus.Error) {
log.Debug("GetValue() called for ", f)
log.Debug("...returning ", victronValues[0][f])
return victronValues[0][f], nil
}
func (f objectpath) GetText() (string, *dbus.Error) {
log.Debug("GetText() called for ", f)
log.Debug("...returning ", victronValues[1][f])
// Why does this end up ""SOMEVAL"" ... trim it I guess
return strings.Trim(victronValues[1][f].String(), "\""), nil
}
func init() {
lvl, ok := os.LookupEnv("LOG_LEVEL")
if !ok {
lvl = "info"
}
ll, err := log.ParseLevel(lvl)
if err != nil {
ll = log.DebugLevel
}
log.SetLevel(ll)
}
func main() {
// Need to implement following paths:
// https://github.com/victronenergy/venus/wiki/dbus#grid-meter
// also in system.py
victronValues[0]["/Connected"] = dbus.MakeVariant(1)
victronValues[1]["/Connected"] = dbus.MakeVariant("1")
victronValues[0]["/CustomName"] = dbus.MakeVariant("Grid meter")
victronValues[1]["/CustomName"] = dbus.MakeVariant("Grid meter")
victronValues[0]["/DeviceInstance"] = dbus.MakeVariant(30)
victronValues[1]["/DeviceInstance"] = dbus.MakeVariant("30")
// also in system.py
victronValues[0]["/DeviceType"] = dbus.MakeVariant(71)
victronValues[1]["/DeviceType"] = dbus.MakeVariant("71")
victronValues[0]["/ErrorCode"] = dbus.MakeVariantWithSignature(0, dbus.SignatureOf(123))
victronValues[1]["/ErrorCode"] = dbus.MakeVariant("0")
victronValues[0]["/FirmwareVersion"] = dbus.MakeVariant(2)
victronValues[1]["/FirmwareVersion"] = dbus.MakeVariant("2")
// also in system.py
victronValues[0]["/Mgmt/Connection"] = dbus.MakeVariant("/dev/ttyUSB0")
victronValues[1]["/Mgmt/Connection"] = dbus.MakeVariant("/dev/ttyUSB0")
victronValues[0]["/Mgmt/ProcessName"] = dbus.MakeVariant("/opt/color-control/dbus-cgwacs/dbus-cgwacs")
victronValues[1]["/Mgmt/ProcessName"] = dbus.MakeVariant("/opt/color-control/dbus-cgwacs/dbus-cgwacs")
victronValues[0]["/Mgmt/ProcessVersion"] = dbus.MakeVariant("1.8.0")
victronValues[1]["/Mgmt/ProcessVersion"] = dbus.MakeVariant("1.8.0")
victronValues[0]["/Position"] = dbus.MakeVariantWithSignature(0, dbus.SignatureOf(123))
victronValues[1]["/Position"] = dbus.MakeVariant("0")
// also in system.py
victronValues[0]["/ProductId"] = dbus.MakeVariant(45058)
victronValues[1]["/ProductId"] = dbus.MakeVariant("45058")
// also in system.py
victronValues[0]["/ProductName"] = dbus.MakeVariant("Grid meter")
victronValues[1]["/ProductName"] = dbus.MakeVariant("Grid meter")
victronValues[0]["/Serial"] = dbus.MakeVariant("BP98305081235")
victronValues[1]["/Serial"] = dbus.MakeVariant("BP98305081235")
// Provide some initial values... note that the values must be a valid formt otherwise dbus_systemcalc.py exits like this:
//@400000005ecc11bf3782b374 File "/opt/victronenergy/dbus-systemcalc-py/dbus_systemcalc.py", line 386, in _handletimertick
//@400000005ecc11bf37aa251c self._updatevalues()
//@400000005ecc11bf380e74cc File "/opt/victronenergy/dbus-systemcalc-py/dbus_systemcalc.py", line 678, in _updatevalues
//@400000005ecc11bf383ab4ec c = _safeadd(c, p, pvpower)
//@400000005ecc11bf386c9674 File "/opt/victronenergy/dbus-systemcalc-py/sc_utils.py", line 13, in safeadd
//@400000005ecc11bf387b28ec return sum(values) if values else None
//@400000005ecc11bf38b2bb7c TypeError: unsupported operand type(s) for +: 'int' and 'unicode'
//
victronValues[0]["/Ac/L1/Power"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L1/Power"] = dbus.MakeVariant("0 W")
victronValues[0]["/Ac/L2/Power"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L2/Power"] = dbus.MakeVariant("0 W")
victronValues[0]["/Ac/L3/Power"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L3/Power"] = dbus.MakeVariant("0 W")
victronValues[0]["/Ac/L1/Voltage"] = dbus.MakeVariant(230)
victronValues[1]["/Ac/L1/Voltage"] = dbus.MakeVariant("230 V")
victronValues[0]["/Ac/L2/Voltage"] = dbus.MakeVariant(230)
victronValues[1]["/Ac/L2/Voltage"] = dbus.MakeVariant("230 V")
victronValues[0]["/Ac/L3/Voltage"] = dbus.MakeVariant(230)
victronValues[1]["/Ac/L3/Voltage"] = dbus.MakeVariant("230 V")
victronValues[0]["/Ac/L1/Current"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L1/Current"] = dbus.MakeVariant("0 A")
victronValues[0]["/Ac/L2/Current"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L2/Current"] = dbus.MakeVariant("0 A")
victronValues[0]["/Ac/L3/Current"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L3/Current"] = dbus.MakeVariant("0 A")
victronValues[0]["/Ac/L1/Energy/Forward"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L1/Energy/Forward"] = dbus.MakeVariant("0 kWh")
victronValues[0]["/Ac/L2/Energy/Forward"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L2/Energy/Forward"] = dbus.MakeVariant("0 kWh")
victronValues[0]["/Ac/L3/Energy/Forward"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L3/Energy/Forward"] = dbus.MakeVariant("0 kWh")
victronValues[0]["/Ac/L1/Energy/Reverse"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L1/Energy/Reverse"] = dbus.MakeVariant("0 kWh")
victronValues[0]["/Ac/L2/Energy/Reverse"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L2/Energy/Reverse"] = dbus.MakeVariant("0 kWh")
victronValues[0]["/Ac/L3/Energy/Reverse"] = dbus.MakeVariant(0.0)
victronValues[1]["/Ac/L3/Energy/Reverse"] = dbus.MakeVariant("0 kWh")
basicPaths := []dbus.ObjectPath{
"/Connected",
"/CustomName",
"/DeviceInstance",
"/DeviceType",
"/ErrorCode",
"/FirmwareVersion",
"/Mgmt/Connection",
"/Mgmt/ProcessName",
"/Mgmt/ProcessVersion",
"/Position",
"/ProductId",
"/ProductName",
"/Serial",
}
updatingPaths := []dbus.ObjectPath{
"/Ac/L1/Power",
"/Ac/L2/Power",
"/Ac/L3/Power",
"/Ac/L1/Voltage",
"/Ac/L2/Voltage",
"/Ac/L3/Voltage",
"/Ac/L1/Current",
"/Ac/L2/Current",
"/Ac/L3/Current",
"/Ac/L1/Energy/Forward",
"/Ac/L2/Energy/Forward",
"/Ac/L3/Energy/Forward",
"/Ac/L1/Energy/Reverse",
"/Ac/L2/Energy/Reverse",
"/Ac/L3/Energy/Reverse",
}
defer conn.Close()
// Some of the victron stuff requires it be called grid.cgwacs... using the only known valid value (from the simulator)
// This can _probably_ be changed as long as it matches com.victronenergy.grid.cgwacs_*
reply, err := conn.RequestName("com.victronenergy.grid.cgwacs_ttyUSB0_di30_mb1",
dbus.NameFlagDoNotQueue)
if err != nil {
log.Panic("Something went horribly wrong in the dbus connection")
panic(err)
}
if reply != dbus.RequestNameReplyPrimaryOwner {
log.Panic("name cgwacs_ttyUSB0_di30_mb1 already taken on dbus.")
os.Exit(1)
}
for i, s := range basicPaths {
log.Debug("Registering dbus basic path #", i, ": ", s)
conn.Export(objectpath(s), s, "com.victronenergy.BusItem")
conn.Export(introspect.Introspectable(intro), s, "org.freedesktop.DBus.Introspectable")
}
for i, s := range updatingPaths {
log.Debug("Registering dbus update path #", i, ": ", s)
conn.Export(objectpath(s), s, "com.victronenergy.BusItem")
conn.Export(introspect.Introspectable(intro), s, "org.freedesktop.DBus.Introspectable")
}
log.Info("Successfully connected to dbus and registered as a meter... Commencing reading of the SMA meter")
multicast.Listen(address, msgHandler)
// This is a forever loop^^
panic("Error: We terminated.... how did we ever get here?")
}
func msgHandler(src *net.UDPAddr, n int, b []byte) {
// This function will be called with every datagram sent by the SMA meter
smasusyIDStr := os.Getenv("SMASUSYID")
smasusyID, err := strconv.ParseUint(smasusyIDStr, 10, 32)
if err != nil {
smasusyID = 0
}
// 0-28: SMA/SUSyID/SN/Uptime
log.Debug("----------------------")
log.Debug("Received datagram from meter")
// There are some broadcast packets caught by the multicast listener, that the meter is sending to 9522.
// See https://github.com/mitchese/shm-et340/issues/2
if 24681 != binary.BigEndian.Uint16(b[16:18]) {
log.Debug("The protocol ID didn't match 0x6069, it's not a meter update. ProtocolID: ", binary.BigEndian.Uint16(b[16:18]))
return
}
if binary.BigEndian.Uint32(b[20:24]) == 0xffffffff {
log.Debug("Implausible serial, rejecting")
return
}
if smasusyID > 0 && uint32(smasusyID) != binary.BigEndian.Uint32(b[20:24]) {
log.Debugf("Oops, I was told to only listen for updates from %d, but this update is from %d", smasusyID, binary.BigEndian.Uint32(b[20:24]))
return
}
if n < 500 {
log.Debug("Received packet is probably too small. Size: ", n)
log.Debug("Serial: ", binary.BigEndian.Uint32(b[20:24]))
return
}
log.Debug("Uid: ", binary.BigEndian.Uint32(b[4:8]))
log.Debug("Serial: ", binary.BigEndian.Uint32(b[20:24]))
// ...buy.... ...sell... both in 0.1W, converted to W
powertot := ((float32(binary.BigEndian.Uint32(b[32:36])) - float32(binary.BigEndian.Uint32(b[52:56]))) / 10.0)
// in watt seconds, convert to kWh
bezugtot := float64(binary.BigEndian.Uint64(b[40:48])) / 3600.0 / 1000.0
einsptot := float64(binary.BigEndian.Uint64(b[60:68])) / 3600.0 / 1000.0
log.Debug("Total W: ", powertot)
log.Debug("Total Buy kWh: ", bezugtot)
log.Debug("Total Sell kWh: ", einsptot)
log.Info(fmt.Sprintf("Meter update received: %.2f kWh bought and %.2f kWh sold, %.1f W currently flowing", bezugtot, einsptot, powertot))
updateVariant(float64(powertot), "W", "/Ac/Power")
updateVariant(float64(einsptot), "kWh", "/Ac/Energy/Reverse")
updateVariant(float64(bezugtot), "kWh", "/Ac/Energy/Forward")
L1 := decodePhaseChunk(b[164:308])
L2 := decodePhaseChunk(b[308:452])
L3 := decodePhaseChunk(b[452:596])
log.Debug("+-----+-------------+---------------+---------------+")
log.Debug("|value| L1 \t| L2 \t| L3 \t|")
log.Debug("+-----+-------------+---------------+---------------+")
log.Debug(fmt.Sprintf("| V | %8.2f \t| %8.2f \t| %8.2f \t|", L1.voltage, L2.voltage, L3.voltage))
log.Debug(fmt.Sprintf("| A | %8.2f \t| %8.2f \t| %8.2f \t|", L1.a, L2.a, L3.a))
log.Debug(fmt.Sprintf("| W | %8.2f \t| %8.2f \t| %8.2f \t|", L1.power, L2.power, L3.power))
log.Debug(fmt.Sprintf("| kWh | %8.2f \t| %8.2f \t| %8.2f \t|", L1.forward, L2.forward, L3.forward))
log.Debug(fmt.Sprintf("| kWh | %8.2f \t| %8.2f \t| %8.2f \t|", L1.reverse, L2.reverse, L3.reverse))
log.Debug("+-----+-------------+---------------+---------------+")
// L1
updateVariant(float64(L1.power), "W", "/Ac/L1/Power")
updateVariant(float64(L1.voltage), "V", "/Ac/L1/Voltage")
updateVariant(float64(L1.a), "A", "/Ac/L1/Current")
updateVariant(L1.forward, "kWh", "/Ac/L1/Energy/Forward")
updateVariant(L1.reverse, "kWh", "/Ac/L1/Energy/Reverse")
// L2
updateVariant(float64(L2.power), "W", "/Ac/L2/Power")
updateVariant(float64(L2.voltage), "V", "/Ac/L2/Voltage")
updateVariant(float64(L2.a), "A", "/Ac/L2/Current")
updateVariant(L2.forward, "kWh", "/Ac/L2/Energy/Forward")
updateVariant(L2.reverse, "kWh", "/Ac/L2/Energy/Reverse")
// L3
updateVariant(float64(L3.power), "W", "/Ac/L3/Power")
updateVariant(float64(L3.voltage), "V", "/Ac/L3/Voltage")
updateVariant(float64(L3.a), "A", "/Ac/L3/Current")
updateVariant(L3.forward, "kWh", "/Ac/L3/Energy/Forward")
updateVariant(L3.reverse, "kWh", "/Ac/L3/Energy/Reverse")
}
func decodePhaseChunk(b []byte) *singlePhase {
// why does this measure in 1/10 of watts?!
bezugW := float32(binary.BigEndian.Uint32(b[4:8])) / 10.0
einspeiseW := float32(binary.BigEndian.Uint32(b[24:28])) / 10.0
// this is in watt seconds ... chagne to kilo(100)watthour(3600)s:
bezugkWh := float64(binary.BigEndian.Uint64(b[12:20])) / 3600.0 / 1000.0
einspeisekWh := float64(binary.BigEndian.Uint64(b[32:40])) / 3600.0 / 1000.0
// not used, but leaving here for future
//bezugVA := float32(binary.BigEndian.Uint32(b[84:88])) / 10
//einspeiseVA := float32(binary.BigEndian.Uint32(b[104:108])) / 10
L := singlePhase{}
L.voltage = float32(binary.BigEndian.Uint32(b[132:136])) / 1000 // millivolts!
L.power = bezugW - einspeiseW
L.a = L.power / L.voltage
L.forward = bezugkWh
L.reverse = einspeisekWh
return &L
//log.Println(phase, "Buy: ", float32(binary.BigEndian.Uint32(b[4:8]))/10)
//log.Println(phase, "Sell: ", float32(binary.BigEndian.Uint32(b[24:28]))/10)
//return
}
func updateVariant(value float64, unit string, path string) {
emit := make(map[string]dbus.Variant)
emit["Text"] = dbus.MakeVariant(fmt.Sprintf("%.2f", value) + unit)
emit["Value"] = dbus.MakeVariant(float64(value))
victronValues[0][objectpath(path)] = emit["Value"]
victronValues[1][objectpath(path)] = emit["Text"]
conn.Emit(dbus.ObjectPath(path), "com.victronenergy.BusItem.PropertiesChanged", emit)
}