bt-sensors-plugin-sk/sensor_classes/VictronInverter.js

Bluetooth Sensors for Signalk -- support for Victron devices, RuuviTag, Xiaomi, ATC and Inkbird, Ultrasonic wind meters, Mopeka tank readers, Renogy Battery and Solar Controllers, Aranet4 environment sensors, SwitchBot temp and humidity sensors, Kilovault

const VictronSensor = require("./Victron/VictronSensor");
const VC=require("./Victron/VictronConstants.js")
const BitReader = require('./_BitReader')

class VictronInverter extends VictronSensor{
    static async identify(device){
        return await this.identifyMode(device, 0x03)
    }

    async init() {
        await super.init()
        this.initMetadata()
    }
    initMetadata(){
        this.addMetadatum('deviceState','', 'inverter device state', 
            (buff)=>{return VC.OperationMode.get(buff.readIntU8(0))})
        const md = this.addMetadatum('alarmReason','', 'reason for alarm',
            (buff)=>{return buff.readIntU16LE(1)})
        md.notify=true

        this.addMetadatum('batteryVoltage','V', 'battery voltage', 
            (buff)=>{return this.NaNif(buff.readInt16LE(3),0x7FFF)/100})
        this.addMetadatum('acPower','W', 'AC power (in watts: Apparent Power * Power Factor)', 
            (buff)=>{return this.NaNif( buff.readUInt16LE(5), 0xFFFF )*this.powerFactor})
        this.addMetadatum('acVoltage','V','AC Voltage')
        this.addMetadatum('acCurrent','A', 'AC Current')
                
    }
    powerFactor = .8 //parameterize anon

    emitValuesFrom(decData){
        super.emitValuesFrom(decData)
        const br = new BitReader(decData.subarray(5))
        this.emit('acVoltage',
            this.NaNif(br.read_unsigned_int(15),0x7FFF)/100)
        this.addMetadatum('acCurrent',
            this.NaNif(br.read_unsigned_int(11),0x7FF)/10)
        const alarm = this.getMetadatum("alarmReason").read(decData)
        if (alarm>0){
            this.emit(
                `ALARM #${alarm} from ${this.getDisplayName()})`, 
                { message: VC.AlarmReason.get(alarm), state: 'alert'})
        }
    }
    

}
module.exports=VictronInverter