Neato Botvac Charge Data logger

log.json

{
  "timestamp": "2019-12-03T00:01:01.274Z",
  "Label": "Value",
  "FuelPercent": "21",
  "BatteryOverTemp": "0",
  "ChargingActive": "0",
  "ChargingEnabled": "1",
  "ConfidentOnFuel": "0",
  "OnReservedFuel": "0",
  "EmptyFuel": "0",
  "BatteryFailure": "1",
  "ExtPwrPresent": "1",
  "ThermistorPresent": "1",
  "BattTempCAvg": "27",
  "VBattV": "14.41",
  "VExtV": "17.60",
  "Charger_mAH": "0",
  "Discharge_mAH": "0"
}

logger.js

const SerialPort = require("serialport");
const Readline = require("@serialport/parser-readline");

const DATA_TIMEOUT = 5000;
const INTERVAL = 30000;
const PORT = "/dev/tty.usbmodemxxxx_xxxx_xxxx1";

const port = new SerialPort(PORT, { baudRate: 115200 })

const parser = new Readline()
port.pipe(parser)

// Pattern: Label,Value\n
const matcher = /^(?<label>.+),(?<value>.+)\n?$/

function logChargerValues() {
  const output = {
    timestamp: new Date()
  };

  const listener = (data) => {
    const res = matcher.exec(data.trim());

    if (res) {
      const { groups: { label, value }} = res;
      output[label] = value;
    }
  };

  const finish = () => {
    parser.off("data", listener);
    console.log(JSON.stringify(output));
  };

  parser.on("data", listener);
  setTimeout(finish, DATA_TIMEOUT);

  port.write("GetCharger\n");
}

setInterval(logChargerValues, INTERVAL);