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ble-pasv-mqtt-gw.js
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/**
* BLE passive temperature sensor scanner and MQTT gateway
* Detected devices will be automatically registered to HA/Domoticz MQTT Autodiscovery
*
* Supported payloads: ATC/Xiaomi/BTHomev2 through advertisements packets
*
* Sensor values sent to 'mqtt_topic' and device config objects sent to 'discovery_topic'.
* Copyleft Alexander Nagy @ bitekmindenhol.blog.hu
*/
let CONFIG = {
mqtt_topic: "blegateway/",
// if mqtt_src is defined, there will be a src field with this value in every mqtt message to identify the shelly which created this message. ie. "shelly-123456"
mqtt_src: null,
discovery_topic: "homeassistant/",
};
const SCAN_PARAM_WANT = { duration_ms: BLE.Scanner.INFINITE_SCAN, active: false }
//BTHomev2: ID , Size, Sign, Factor, Name
let datatypes = [
[0x00, 1, false, 1, 'pid'],
[0x01, 1, false, 1, 'battery'],
[0x12, 2, false, 1, 'co2'],
[0x0c, 2, false, 0.001,'voltage'],
[0x4a, 2, false, 0.1, 'voltage'],
[0x08, 2, true, 0.01, 'dewpoint'],
[0x03, 2, false, 0.01, 'humidity'],
[0x2e, 1, false, 1, 'humidity'],
[0x05, 3, false, 0.01, 'illuminance'],
[0x14, 2, false, 0.01, 'moisture'],
[0x2f, 1, false, 1, 'moisture'],
[0x04, 3, false, 0.01, 'pressure'],
[0x45, 2, true, 0.1, 'temperature'],
[0x02, 2, true, 0.01, 'temperature'],
[0x3f, 2, true, 0.1, 'rotation'],
[0x3a, 1, false, 1, 'button'], //selector
[0x15, 1, false, 1, 'battery_ok'], //binary
[0x16, 1, false, 1, 'battery_charging'], //binary
[0x17, 1, false, 1, 'co'], //binary
[0x18, 1, false, 1, 'cold'], //binary
[0x1a, 1, false, 1, 'door'], //binary
[0x1b, 1, false, 1, 'garage_door'], //binary
[0x1c, 1, false, 1, 'gas'], //binary
[0x1d, 1, false, 1, 'heat'], //binary
[0x1e, 1, false, 1, 'light'], //binary
[0x1f, 1, false, 1, 'lock'], //binary
[0x20, 1, false, 1, 'moisture_warn'], //binary
[0x21, 1, false, 1, 'motion'], //binary
[0x2d, 1, false, 1, 'window'], //binary
];
let discovered = [];
//format is subset of https://docs.python.org/3/library/struct.html
let packedStruct = {
buffer: '',
setBuffer: function(buffer) {
this.buffer = buffer;
},
utoi: function(u16) {
return (u16 & 0x8000) ? u16 - 0x10000 : u16;
},
getUInt8: function() {
return this.buffer.at(0)
},
getInt8: function() {
let int = this.getUInt8();
if(int & 0x80) int = int - 0x100;
return int;
},
getUInt16LE: function() {
return 0xffff & (this.buffer.at(1) << 8 | this.buffer.at(0));
},
getInt16LE: function() {
return this.utoi(this.getUInt16LE());
},
getUInt16BE: function() {
return 0xffff & (this.buffer.at(0) << 8 | this.buffer.at(1));
},
getInt16BE: function() {
return this.utoi(this.getUInt16BE(this.buffer));
},
getUInt24LE: function() {
return 0xffffff & (this.buffer.at(2) << 16 | this.buffer.at(1) << 8 | this.buffer.at(0));
},
getInt24LE: function() {
return this.utoi(this.getUInt24LE());
},
getUInt24BE: function() {
return 0xffffff & (this.buffer.at(0) << 16 | this.buffer.at(1) << 8 | this.buffer.at(2));
},
getInt24BE: function() {
return this.utoi(this.getUInt24BE(this.buffer));
},
unpack: function(fmt, keyArr) {
let b = '<>!';
let le = fmt[0] === '<';
if(b.indexOf(fmt[0]) >= 0) {
fmt = fmt.slice(1);
}
let pos = 0;
let jmp;
let bufFn;
let res = {};
while(pos<fmt.length && pos<keyArr.length && this.buffer.length > 0) {
jmp = 0;
bufFn = null;
if(fmt[pos] === 'b' || fmt[pos] === 'B') jmp = 1;
if(fmt[pos] === 'h' || fmt[pos] === 'H') jmp = 2;
if(fmt[pos] === 'i' || fmt[pos] === 'I') jmp = 3;
if(fmt[pos] === '4') jmp = 4; //just skip for now
if(fmt[pos] === '6') jmp = 6; //just skip for now
if(fmt[pos] === 'b') {
res[keyArr[pos]] = this.getInt8();
}
else if(fmt[pos] === 'B') {
res[keyArr[pos]] = this.getUInt8();
}
else if(fmt[pos] === 'h') {
res[keyArr[pos]] = le ? this.getInt16LE() : this.getInt16BE();
}
else if(fmt[pos] === 'H') {
res[keyArr[pos]] = le ? this.getUInt16LE() : this.getUInt16BE();
}
else if(fmt[pos] === 'i') {
res[keyArr[pos]] = le ? this.getInt24LE() : this.getInt24BE();
}
else if(fmt[pos] === 'I') {
res[keyArr[pos]] = le ? this.getUInt24LE() : this.getUInt24BE();
}
this.buffer = this.buffer.slice(jmp);
pos++;
}
return res;
}
};
function convertByteArrayToSignedInt(bytes, byteSize) {
let result = 0;
const signBit = 1 << (byteSize * 8 - 1);
for (let i = 0; i < byteSize; i++) {
result |= (bytes.at(i) << (i * 8));
}
// Check sign bit and sign-extend if needed
if ((result & signBit) !== 0) {
result = result - (1 << (byteSize * 8));
}
return result;
};
function convertByteArrayToUnsignedInt(bytes, byteSize) {
let result = 0;
for (let i = 0; i < byteSize; i++) {
result |= (bytes.at(i) << (i * 8));
}
return result >>> 0; // Ensure the result is an unsigned integer
};
function extractBTHomeData(payload) {
let index = 0;
let extractedData = {};
while (index < payload.length) {
dataId = payload.at(index);
index = index + 1;
let dataType = -1;
for (let i=0; i<datatypes.length; i++) {
if (datatypes[i][0] == dataId) {
dataType = i;
break;
}
}
if (dataType >-1) {
let byteSize = datatypes[i][1];
let factor = datatypes[i][3];
let rawdata = payload.slice(index, index + byteSize);
if (datatypes[i][2]) {
value = convertByteArrayToSignedInt(rawdata, byteSize);
} else {
value = convertByteArrayToUnsignedInt(rawdata, byteSize);
}
extractedData[ datatypes[i][4] ] = value * factor;
index += byteSize;
} else { index = 10;}
}
return extractedData;
};
function gettopicname(resarray) {
let resstr = "";
let rlen = Object.keys(resarray).length;
if (rlen>0) {
if (rlen==1) {
resstr = Object.keys(resarray)[0];
} else if (("temperature" in resarray) || ("humidity" in resarray) || ("pressure" in resarray)) {
resstr = "sensor";
} else if ("battery" in resarray) {
resstr = "telemetry";
} else {
resstr = "status";
}
}
return resstr;
}
function autodiscovery(address, topname, topic, jsonstr) {
let adstr = [ ];
let params = Object.keys(jsonstr);
let subt = "";
for (let i = 0; i<params.length; i++) {
let pload = {};
subt = "";
pload["device"] = {};
pload["device"]["name"] = address + " " + topname;
pload["device"]["identifiers"] = [];
pload["device"]["identifiers"].push(address);
pload["name"] = pload["device"]["name"];
pload["stat_t"] = topic;
pload["uniq_id"] = address+"-"+params[i];
pload["stat_cla"] = "measurement";
if (params[i] == "temperature") {
pload["dev_cla"] = params[i];
pload["unit_of_meas"] = "C";
subt = params[i];
} else if (params[i] == "humidity") {
pload["dev_cla"] = params[i];
pload["unit_of_meas"] = "%";
subt = params[i];
} else if (params[i] == "battery") {
pload["dev_cla"] = params[i];
pload["unit_of_meas"] = "%";
subt = params[i];
} else if (params[i] == "illuminance") {
pload["dev_cla"] = params[i];
pload["unit_of_meas"] = "lx";
subt = params[i];
} else if (params[i] == "pressure") {
pload["dev_cla"] = "atmospheric_pressure";
pload["unit_of_meas"] = "hPa";
subt = pload["dev_cla"];
} else if (params[i] == "rssi") {
pload["dev_cla"] = "signal_strength";
pload["entity_category"] = "diagnostic";
pload["unit_of_meas"] = "dBm";
subt = "RSSI";
}
if (subt != "") {
pload["value_template"] = "{{ value_json." + params[i] + " }}";
adstr.push( [ CONFIG.discovery_topic + "sensor/" + address + "/"+subt+"/config", JSON.stringify(pload) ] );
}
}
return adstr;
}
function mqttreport(address, rssi, jsonstr) {
let addrstr = String(address).split(':').join('');
let topname = gettopicname(jsonstr);
let topic = CONFIG.mqtt_topic + addrstr + "/" + topname;
jsonstr['rssi'] = rssi;
if (CONFIG.mqtt_src) {
jsonstr['src'] = CONFIG.mqtt_src;
}
if (discovered.indexOf(addrstr+topname) == -1) {
let adstr = autodiscovery(addrstr,topname,topic,jsonstr);
if (adstr.length > 0) {
for (let i = 0; i<adstr.length; i++) {
if (adstr[i].length > 1) {
MQTT.publish(adstr[i][0],adstr[i][1],1,true); // console.log("AD",i,adstr[i][0],adstr[i][1]);
}
}
}
discovered.push(addrstr+topname); //mark as discovered
} // end AD
MQTT.publish(topic,JSON.stringify(jsonstr),0,false); // console.log(topic,JSON.stringify(jsonstr),1,true);
}
function scanCB(ev, res) {
if (ev !== BLE.Scanner.SCAN_RESULT) return;
if (res.advData.length < 10) return;
let prot = "";
let sc = 0;
while (sc < 10) { //strip unneeded data
sc = sc + 1;
if (res.advData.at(0) > 9) {
sc = 10;
} else {
if (res.advData.length > res.advData.at(0)) {
res.advData = res.advData.slice( res.advData.at(0)+1 );
}
}
}
if (res.advData.length < 10) return;
let hdr = {};
// console.log(res.addr,res.rssi,res.advData.length,res.advData.at(0), res.advData.at(1) ,res.advData.at(2), res.advData.at(3),res.advData.at(6), res.advData.at(7),res.advData.at(15), res.advData.at(16));
if (res.advData.at(1) == 0x16) {
packedStruct.setBuffer(res.advData);
if ((res.advData.at(2) == 0x1a) && (res.advData.at(3) == 0x18)) { //atc
if (res.advData.length==17) { //atc1441
hdr = packedStruct.unpack('>46hBBHB', ['id','mac','temperature','humidity','battery','battery_mv','frame']);
hdr.temperature = hdr.temperature / 10.0;
prot = "atc1441";
} else if (res.advData.length==19) { //atc custom
hdr = packedStruct.unpack('<46hHHBBB', ['id','mac','temperature','humidity','battery_mv','battery','frame']);
hdr.temperature = hdr.temperature * 0.01;
hdr.humidity = hdr.humidity * 0.01;
prot = "atc_custom";
}
} //end atc
else if ((res.advData.at(2) == 0x95) && (res.advData.at(3) == 0xfe)) { //xiaomi
if (res.advData.length < 18) return;
prot = "xiaomi";
let ofs = 0;
if ( (res.advData.at(16) != 0x10) && (res.advData.at(17) == 0x10) ) {
ofs = 1;
}
if ( (res.advData.at(6) == 0x76) && (res.advData.at(7) == 0x05) ) {
packedStruct.setBuffer(res.advData.slice(17));
hdr = packedStruct.unpack('<hH', ['temperature','humidity']);
hdr.temperature = hdr.temperature / 10.0;
hdr.humidity = hdr.humidity / 10.0;
} else {
let dataType = res.advData.at(15 + ofs);
let dataSize = res.advData.at(17 + ofs);
if ( (dataType == 4) && (dataSize > 0) ) {
packedStruct.setBuffer(res.advData.slice(18+ofs));
hdr = packedStruct.unpack('<h', ['temperature']);
hdr.temperature = hdr.temperature / 10.0;
} else if ( (dataType == 6) && (dataSize > 0) ) {
packedStruct.setBuffer(res.advData.slice(18+ofs));
hdr = packedStruct.unpack('<H', ['humidity']);
hdr.humidity = hdr.humidity / 10.0;
} else if ( (dataType == 7) && (dataSize >= 3) ) {
packedStruct.setBuffer(res.advData.slice(18+ofs));
hdr = packedStruct.unpack('<I', ['illuminance']);
} else if ( (dataType == 8) && (dataSize == 1) ) {
packedStruct.setBuffer(res.advData.slice(18+ofs));
hdr = packedStruct.unpack('<B', ['moisture']);
} else if ( (dataType == 9) && (dataSize > 0) ) {
packedStruct.setBuffer(res.advData.slice(18+ofs));
hdr = packedStruct.unpack('<H', ['soil']);
} else if ( (dataType == 0xA) && (dataSize > 0) ) {
hdr = { battery: res.advData.at(18+ofs)};
} else if ( (dataType == 0xD) && (dataSize > 3) ) {
packedStruct.setBuffer(res.advData.slice(18+ofs));
hdr = packedStruct.unpack('<hH', ['temperature','humidity']);
hdr.temperature = hdr.temperature / 10.0;
hdr.humidity = hdr.humidity / 10.0;
}
}
} // end xiaomi
else if ((res.advData.at(2) == 0xd2) && (res.advData.at(3) == 0xfc)) { //bthomev2
if ( (res.advData.at(4) & 0x1) != 1 ) { // no encryption
prot = 'bthome2';
hdr = extractBTHomeData(res.advData.slice(5))
}
} // end bthomev2
} //0x16
if (prot != "") { mqttreport(res.addr, res.rssi, hdr); }; // console.log(prot, res.addr, res.rssi, hdr);
}
function init() {
// get the config of ble component
const BLEConfig = Shelly.getComponentConfig("ble");
// exit if the BLE isn't enabled
if (!BLEConfig.enable) {
console.log(
"Error: The Bluetooth is not enabled, please enable it from settings"
);
return;
}
// check if the scanner is already running
if (BLE.Scanner.isRunning()) {
console.log("Info: The BLE gateway is running, the BLE scan configuration is managed by the device");
}
else {
// start the scanner
const bleScanner = BLE.Scanner.Start(SCAN_PARAM_WANT);
if (!bleScanner) {
console.log("Error: Can not start new scanner");
}
}
// subscribe a callback to BLE scanner
BLE.Scanner.Subscribe(scanCB);
}
init();