bt-sensors-plugin-sk/sensor_classes/Aranet4.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 AranetSensor = require("./Aranet/AranetSensor");
class Aranet4 extends AranetSensor{
    
    constructor(device, config={}){
        super(device,config)
    }

    static async identify(device){
        const name = await this.getDeviceProp(device,"Name")
        
        if ((await super.identify(device) != null) && 
            name.toLowerCase().startsWith("aranet4")) {
            return this
        }
        return null
    }
    
    async init() {
        await super.init()
        this.initMetadata()
    }

    initMetadata(){
            this.addMetadatum('co2', 'ppm',  'co2 concentration',
                (buff)=>{return ((buff.readUInt16LE(8)))})
            this.addMetadatum('temp','K', 'temperature',
                (buff)=>{return parseFloat((273.15+(buff.readInt16LE(10))/20).toFixed(2))})

            this.addMetadatum("pressure","hPa","atmospheric pressure", 
                (buff)=>{return ((buff.readUInt16LE(12)))/10})

            this.addMetadatum('humidity','ratio', 'humidity',
                (buff)=>{return ((buff.readUInt8(14))/100)})
            this.addMetadatum('batteryStrength', 'ratio',  'sensor battery strength',
                (buff)=>{return ((buff.readUInt8(15))/100)})
            this.addMetadatum('color', '',  'Warning color (G Y R)',
                (buff)=>{return this.COLOR[buff.readUInt8(16)]})
            
    }
    propertiesChanged(props){
        super.propertiesChanged(props)    
        if (!props.hasOwnProperty("ManufacturerData")) return

        const buff = this.getManufacturerData(0x0702)
        this.emitData("co2", buff)
        this.emitData("temp", buff)
        this.emitData("humidity", buff)
        this.emitData("pressure", buff)
        this.emitData("batteryStrength", buff)
        this.emitData("color", buff)
        
    }                    

}
module.exports=Aranet4