Read and parse data from the "Lono Thermo Hygro" sensor.

lono-thermo-hygro-BLE.js

/**
 * Copyright 2023 moritzmhmk.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the “Software”),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * ----------------------------------------------------------------------------
 *
 * The sensor in question is described here:
 * https://web.archive.org/web/20231005102046/https://files2.elv.com/public/11/1155/115549/Internet/115549_w030_bda.pdf
 *
 * The sensor was sold under different brandings (e.g. Lono, Mebus).
 *
 * The BLE protocol is very simple: The data consists of 5 bytes "TTGCH".
 * TT: time in "5-minute-steps" since the measurement
 * G: Group of the sensor.
 * C: Temperature in degrees celsius + 40 (i.e. 61 = 21°C)
 * H: Humidity in percent.
 */

const noble = require("@abandonware/noble");

noble.on("stateChange", async (state) => {
  if (state === "poweredOn") {
    await noble.startScanningAsync(["180f"], false);
  }
});

noble.on("discover", async (peripheral) => {
  // console.log(`${peripheral.address} (${peripheral.advertisement.localName})`);
  if (peripheral.advertisement.localName === "NGE76") {
    console.log(peripheral);
    console.log(peripheral.advertisement); // 1809, 180f
    await peripheral.connectAsync();
    const { services, characteristics } =
      await peripheral.discoverAllServicesAndCharacteristicsAsync();

    services.forEach((service) => {
      console.log(`${service.uuid} (${service.name}, ${service.type}))`);
      service.characteristics.forEach((c) => {
        console.log(`- ${c.uuid} (${c.name}, ${c.type})) ${c.properties}`);
      });
    });

    const modelNumber = characteristics.find((c) => c.uuid === "2a24");
    console.log("Model", (await modelNumber.readAsync()).toString());

    const serialNumber = characteristics.find((c) => c.uuid === "2a25");
    console.log("Serial", (await serialNumber.readAsync()).toString());

    const firmwareRevision = characteristics.find((c) => c.uuid === "2a26");
    console.log("Firmware", (await firmwareRevision.readAsync()).toString());

    const hardwareRevision = characteristics.find((c) => c.uuid === "2a27");
    console.log("Hardware", (await hardwareRevision.readAsync()).toString());

    const softwareRevision = characteristics.find((c) => c.uuid === "2a28");
    console.log("Software", (await softwareRevision.readAsync()).toString());

    const manufacturerName = characteristics.find((c) => c.uuid === "2a29");
    console.log(
      "Manufacturer",
      (await manufacturerName.readAsync()).toString()
    );

    const batteryLevel = characteristics.find((c) => c.uuid === "2a19");
    console.log("Battery", (await batteryLevel.readAsync()).readUint8() + "%");

    const temperatureMeasurement = characteristics.find(
      (c) => c.uuid === "2a1c"
    );
    temperatureMeasurement.on("notify", (data) => console.log("notify", data));
    temperatureMeasurement.on("data", (data) => {
      const FIVE_MINUTES = 5 * 60 * 1000;
      const timestamp = new Date(
        Math.ceil(Date.now() / FIVE_MINUTES - data.readUInt16BE(0)) *
          FIVE_MINUTES
      );
      const channel = data.readUInt8(2);
      const temperature = data.readUInt8(3) - 40;
      const humidity = data.readUint8(4);
      console.log(
        timestamp.toLocaleTimeString(),
        "Channel #" + channel,
        temperature + "°C",
        humidity + "%"
      );
    });
    temperatureMeasurement.subscribe();
  }
});