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

Bluetooth Sensors for Signalk - see https://www.npmjs.com/package/bt-sensors-plugin-sk#supported-sensors for a list of supported sensors

const BTSensor = require("../BTSensor");

class BankManager extends BTSensor{

    static Domain = BTSensor.SensorDomains.electrical
    static async  identify(device){

        const name = await this.getDeviceProp(device,"Name")
        const regex = /^BankManager*[0-9]{2}/
 
        if (name && name.match(regex))  
            return this
        else
            return null
        
    }
    initSchema(){
        super.initSchema()

        this.addDefaultParam("id")
            .default="bankManager"

        this.addMetadatum('liVoltage','V','Lithium Voltage')
            .default="electrical.batteries.{id}.voltage.lithium"
        this.addMetadatum('pbVoltage','V','Lead Voltage')
            .default="electrical.batteries.{id}.voltage.lead"
        this.addMetadatum('current','A','total current')
            .default="electrical.batteries.{id}.current"
        this.addMetadatum('soc','ratio','state of charge')
            .default="electrical.batteries.{id}.soc"
        this.addMetadatum('connectionStatus','','Connection Status')
            .default="electrical.batteries.{id}.connectionStatus"

    }

    getManufacturer(){
        return "Bank Manager"
    }

    usingGATT(){
        return true
    }
    emitDataFrom(buffer){
        let data=buffer.toString().split(",")
        this.emit("liVoltage", parseFloat(data[1]))
        this.emit("pbVoltage", parseFloat(data[2]))
        this.emit("current", parseFloat(data[3])) 
        this.emit("soc", parseFloat(data[4])/100) 
        this.emit("connectionStatus", parseInt(data[5])) 
    }

    emitGATT(){
    
    }
    ImageFile = "BankManager.webp" 

    async initGATTConnection(isReconnecting){ 
        await super.initGATTConnection(isReconnecting)
        const gattServer= await this.getGATTServer()
        const service = await gattServer.getPrimaryService("0000ffe0-0000-1000-8000-00805f9b34fb") 
        this.characteristic = await service.getCharacteristic("0000ffe1-0000-1000-8000-00805f9b34fb")
    }

    async initGATTNotifications() { 
        await this.characteristic.startNotifications()
        let data = null 
        this.characteristic.on('valuechanged', buffer => {
            if (buffer.length>0 && buffer[0]==0x23) {
                data = Buffer.from(buffer)
            } else if (data && buffer.indexOf(0x0d0a)!==-1) {
                data=Buffer.concat([data,buffer.subarray(0,buffer.indexOf(0x0d0a)-1)], data.length+buffer.indexOf(0x0d0a)-1)
                this.emitDataFrom(data)
                data=null
            }
        })
    }
  

    async deactivateGATT(){
        await this.stopGATTNotifications(this.characteristic)
        await this.deactivateGATT()
    }                  
}
module.exports=BankManager