bt-sensors-plugin-sk/sensor_classes/VictronDCEnergyMeter.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 int24 = require("int24");
const _BitReader = require("./_BitReader.js");
class VictronDCEnergyMeter extends VictronSensor{
    
    static async identify(device){
        return await this.identifyMode(device, 0x0D)
    }
    async init(){
        await super.init()
        this.addMetadatum('meterType','', 'meter type', 
            (buff)=>{return VC.MeterType.get( buff.readInt16LE(0))})
        this.addMetadatum('voltage','','voltage',
            (buff)=>{return buff.readInt16LE(2)/100})
        this.addMetadatum('alarm','', 'alarm', 
            (buff)=>{return buff.readUInt16LE(4)})
        if (this.encryptionKey){
            const decData = this.decrypt(this.getManufacturerData(0x02e1))
            if (decData)
                this.auxMode=decData.readInt8(8)&0x3   
        }
        switch(this.auxMode){
            case VC.AuxMode.STARTER_VOLTAGE:
                this.addMetadatum('starterVoltage','V',  'starter battery voltage', 
                        (buff,offset=0)=>{return buff.readInt16LE(offset)/100})
                        break;

            case VC.AuxMode.TEMPERATURE:
                this.addMetadatum('temperature','K','House battery temperature', 
                    (buff,offset=0)=>{
                        const temp = buff.readUInt16LE(offset)
                        if (temp==0xffff) 
                            return null
                        else 
                            return temp / 100
                    })
                    break;
            default:
                break
        }
        this.addMetadatum('current','A', 'current')        
 
    }
    
    emitValuesFrom(decData){
        this.emitData("meterType",decData,0)
        this.emitData("voltage",decData,2);
        const alarm = this.getMetadatum("alarm").read(decData,4)
        if (alarm>0){
            this.emit(
                `ALARM #${alarm} from ${this.getDisplayName()})`, 
                { message: AlarmReason(alarm), state: 'alert'})
        }
        switch(this.auxMode){
            case VC.AuxMode.STARTER_VOLTAGE:
                this.emitData("starterVoltage",decData,6);
                break;
            case VC.AuxMode.TEMPERATURE:
                this.emitData("temperature",decData,6);
                break;
            default:
                break
            } 

        this.emit("current", 
            this.NaNif( new _BitReader(decData.subarray(8,11)).read_signed_int(22),0x3FFFFF)/1000)
  
    }
    

}
module.exports=VictronDCEnergyMeter