bt-sensors-plugin-sk/sensor_classes/SwitchBotTH.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 BTSensor = require("../BTSensor");

class SwitchBotTH extends  BTSensor {
    static async test(){

        const p = {[this.ID.toString()]: [0xd8, 0x35, 0x34, 0x38, 0x4f, 0x70, 0x07, 0x02, 0x04, 0x96, 0x2c, 0x00]}
        this.getDeviceProp=async ()=>{
            return p
        }
        const c = await this.identify()
        const sb = new c()
        sb.initMetadata()
        sb.currentProperties={}
        sb.on("temp", (t)=>console.log(t))
        sb.on("humidity", (h)=>console.log(h))
        sb.on("battery", (b)=>console.log(b))

        sb.propertiesChanged( {ManufacturerData: p})
        
        sb.propertiesChanged( {ServiceData: {[this.batteryService]:[0x77,0x00,0x64]}})

    
    }
    static ID = 0x0969
    static modelID = 0x77
    static batteryService = "0000fd3d-0000-1000-8000-00805f9b34fb"
    static async  identify(device){
        const md = await this.getDeviceProp(device,'ManufacturerData')
        if (!md) return null 
        const keys = Object.keys(md)
        if (keys && keys.length>0){
            const id = keys[keys.length-1]
            if (parseInt(id)==this.ID && md[id].length==12 && md[id][0]==modelID)
                return this
        } 
        return null
        
    }

    async init(){
        await super.init()
        this.initMetadata()
    }
    initMetadata(){
        this.addMetadatum('temp','K', 'temperature', 
            (buffer)=>{
                return (27315+(((buffer[8] & 0x0F)/10 + (buffer[9] & 0x7F)) * (((buffer[9] & 0x80)>0)?100:-100)))/100
            })
        this.addMetadatum('humidity','ratio', 'humidity', 
        
            (buffer)=>{return (buffer[10] & 0x7F)/100    
        })
        
        this.addMetadatum("battery", "ratio", "battery strength",
            (buffer)=>{return buffer[2]/100}
         )
    }

    getManufacturer(){
        return "Wonder Labs"
    }
    getName() {
        "SwitchBotTH"
    }
    async propertiesChanged(props){
        super.propertiesChanged(props)    
        if (props.ManufacturerData) {
            const buffer = this.getManufacturerData(this.constructor.ID)
            if (buffer) {
                this.emitData("temp", buffer)
                this.emitData("humidity", buffer)
            }      
        }
        if (props.ServiceData) {
            const buffer = this.getServiceData(this.constructor.batteryService)
            if (buffer){
                this.emitData("battery", buffer)
            }
        }
   }                         
}
module.exports=SwitchBotTH