Added bms monitoring script

src/bms.js

@@ -0,0 +1,19 @@
+import i2c from 'i2c-bus';
+
+async function bmsStatus(address = 0x57) {
+  const i2cBus = await i2c.openPromisified(1);
+  const data = await Promise.all([
+    i2cBus.readByte(address, 0x02),
+    i2cBus.readByte(address, 0x04),
+    i2cBus.readByte(address, 0x22),
+    i2cBus.readByte(address, 0x23),
+    i2cBus.readByte(address, 0x2a),
+  ]);
+  return {
+    charging: !!((data[0] >> 7) & 1),
+    percentage: data[4] / 100,
+    temperature: data[1] - 40,
+    voltage: ((data[2] << 8) | data[3]) / 1000,
+  }
+}
+console.log(await bmsStatus());

src/http.js

@@ -9,17 +9,20 @@ export default class Http extends Controller {
   constructor(apollo, port = 8000) {
     super(apollo);
     this.express = express();
+
+    this.express.get('/api/*', async (req, res) => {
+      const cmd = req.params['0'];
+      console.log(cmd);
+      res.json(await this.run(cmd));
+    });
+
     this.express.get('*', (req, res) => {
        let p = req.params['0'];
        if(!p || p == '/') p = 'index.html';
        const absolute = path.join(import.meta.url, '/../../ui/', p).replace('file:', '');
        res.sendFile(absolute);
     });
-    this.express.get('/api/*', async (req, res) => {
-      const cmd = req.params['0'];
-      console.log(cmd);
-      res.json(await this.run(cmd));
-    });
+
     this.express.listen(port);
   }
 }

src/sensor-suite.js

@@ -21,16 +21,17 @@ export default class SensorSuite {
     set data(d) { this._data = d; }
     get data() { return {timestamp: new Date().getTime(), ...this._data}; }
 
-    get status() { return { sensors: 'ok' }; }
+    _env_sensor = false;
+    get status() { return { env_sensor: this._env_sensor ? 'ok' : 'failed' }; }
 
     constructor() {
         this.bme280 = new BME280({i2cBusNo: 1, i2cAddress: 0x76});
     }
 
-    async start() {
-        await this.bme280.init();
-
+    start() {
+        return this.bme280.init().then(() => {
           // Poll environmental data
+          this._env_sensor = true;
           this.stopBme280 = poll(async () => {
               const d = await this.bme280.readSensorData();
               this._data.humidity = d.humidity / 100;
@@ -38,6 +39,9 @@ export default class SensorSuite {
               this._data.pressure = d.pressure_hPa;
               this._data.altitude = BME280.calculateAltitudeMeters(this.data.pressure);
           }, 1000);
+        }).catch(err => {
+          this._env_sensor = false;
+        });
     }
 
     stop() {