Beiträge von Whity

 // v0.1
let BTHOME_SVC_ID_STR = "fcd2";

let uint8 = 0;
let int8 = 1;
let uint16 = 2;
let int16 = 3;
let uint24 = 4;
let int24 = 5;

let BTH = {};
let SHELLY_ID = undefined;

BTH[0x00] = { n: "pid", t: uint8 };
BTH[0x01] = { n: "Battery", t: uint8, u: "%" };
BTH[0x05] = { n: "Illuminance", t: uint24, f: 0.01 };
BTH[0x1a] = { n: "Door", t: uint8 };
BTH[0x20] = { n: "Moisture", t: uint8 };
BTH[0x2d] = { n: "Window", t: uint8 };
BTH[0x3a] = { n: "Button", t: uint8 };

function getByteSize(type) {
    if (type === uint8 || type === int8) return 1;
    if (type === uint16 || type === int16) return 2;
    if (type === uint24 || type === int24) return 3;
    //impossible as advertisements are much smaller;
    return 255;
}

let BTHomeDecoder = {
    utoi: function (num, bitsz) {
        let mask = 1 << (bitsz - 1);
        return num & mask ? num - (1 << bitsz) : num;
    },
    getUInt8: function (buffer) {
        return buffer.at(0);
    },
    getInt8: function (buffer) {
        return this.utoi(this.getUInt8(buffer), 8);
    },
    getUInt16LE: function (buffer) {
        return 0xffff & ((buffer.at(1) << 8) | buffer.at(0));
    },
    getInt16LE: function (buffer) {
        return this.utoi(this.getUInt16LE(buffer), 16);
    },
    getUInt24LE: function (buffer) {
        return (
            0x00ffffff & ((buffer.at(2) << 16) | (buffer.at(1) << 8) | buffer.at(0))
        );
    },
    getInt24LE: function (buffer) {
        return this.utoi(this.getUInt24LE(buffer), 24);
    },
    getBufValue: function (type, buffer) {
        if (buffer.length < getByteSize(type)) return null;
        let res = null;
        if (type === uint8) res = this.getUInt8(buffer);
        if (type === int8) res = this.getInt8(buffer);
        if (type === uint16) res = this.getUInt16LE(buffer);
        if (type === int16) res = this.getInt16LE(buffer);
        if (type === uint24) res = this.getUInt24LE(buffer);
        if (type === int24) res = this.getInt24LE(buffer);
        return res;
    },
    unpack: function (buffer) {
        //beacons might not provide BTH service data
        if (typeof buffer !== "string" || buffer.length === 0) return null;
        let result = {};
        let _dib = buffer.at(0);
        result["encryption"] = _dib & 0x1 ? true : false;
        result["BTHome_version"] = _dib >> 5;
        if (result["BTHome_version"] !== 2) return null;
        //can not handle encrypted data
        if (result["encryption"]) return result;
        buffer = buffer.slice(1);

        let _bth;
        let _value;
        while (buffer.length > 0) {
            _bth = BTH[buffer.at(0)];
            if (typeof _bth === "undefined") {
                console.log("BTH: unknown type");
                break;
            }
            buffer = buffer.slice(1);
            _value = this.getBufValue(_bth.t, buffer);
            if (_value === null) break;
            if (typeof _bth.f !== "undefined") _value = _value * _bth.f;
            result[_bth.n] = _value;
            buffer = buffer.slice(getByteSize(_bth.t));
        }
        return result;
    },
};

let lastPacketId = 0x100;

function bleScanCallback(event, result) {
    if (event !== BLE.Scanner.SCAN_RESULT) {
        return;
    }

    if (typeof result.local_name === "undefined" || typeof result.addr === "undefined" || result.local_name.indexOf("SBBT") !== 0) {
        return;
    }

    let servData = result.service_data;

    // exit if service data is null/device is encrypted
    if (servData === null || typeof servData === "undefined" || typeof servData[BTHOME_SVC_ID_STR] === "undefined") {
        console.log("Can't handle encrypted devices");
        return;
    }

    let receivedData = BTHomeDecoder.unpack(servData[BTHOME_SVC_ID_STR]);

    // exit if unpacked data is null or the device is encrypted
    if (receivedData === null || typeof receivedData === "undefined" || receivedData["encryption"]) {
        console.log("Can't handle encrypted devices");
        return;
    }

    // exit if the event is duplicated
    if (lastPacketId === receivedData.pid) {
        return;
    }

    lastPacketId = receivedData["pid"];

    let message = {
        receiver: SHELLY_ID,
        sender: {
            type: result.local_name,
            mac: result.addr
        },
        event: receivedData
    };

    console.log("Publishing " + JSON.stringify(message));

    if (MQTT.isConnected()) {
        MQTT.publish("shellies/ble", JSON.stringify(message));
    }
}

function bleScan() {
    let bleScanner = BLE.Scanner.Start({
        duration_ms: BLE.Scanner.INFINITE_SCAN,
        active: true
    });

    if (bleScanner === false) {
        console.log("Error when starting the BLE scanner");
        return;
    }

    BLE.Scanner.Subscribe(bleScanCallback);
    console.log("BLE is successfully started");
}

Shelly.call("Mqtt.GetConfig", "", function (res, err_code, err_msg, ud) {
  SHELLY_ID = res["topic_prefix"];
});

// Check for BLE config and print a message if BLE is not enabled on the device
let bleConfig = Shelly.getComponentConfig('ble');
if (bleConfig.enable) {
    bleScan();
}