Feeding data from Android phone to Bangle.js continuously?

Sounds great! I had a little try last night with something that'd grab a URL, pull data out of it and broadcast it. The BLE code you need is:

        BluetoothManager mBluetoothManager = (BluetoothManager)mContext.getSystemService(Context.BLUETOOTH_SERVICE);
        BluetoothAdapter mBluetoothAdapter = mBluetoothManager.getAdapter();
        BluetoothLeAdvertiser mBluetoothLeAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser();

        AdvertiseSettings.Builder settingsBuilder = new AdvertiseSettings.Builder();
        settingsBuilder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED); // was ADVERTISE_MODE_LOW_POWER
        settingsBuilder.setTimeout(0); // always!
        //setTxPowerLevel(ADVERTISE_TX_POWER_HIGH.)
        AdvertiseSettings settings = settingsBuilder.build();

        AdvertiseData.Builder dataBuilder = new AdvertiseData.Builder();
        dataBuilder.addManufacturerData(0x0590, foundData.getBytes());
        //dataBuilder.setIncludeDeviceName(true);
        AdvertiseData data = dataBuilder.build();

        mAdvertiseCallback = new SampleAdvertiseCallback();

        mBluetoothLeAdvertiser.stopAdvertising(mAdvertiseCallback);
        mBluetoothLeAdvertiser.startAdvertising(settings, data,
                mAdvertiseCallback);