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stoprocent / noble

A Node.js BLE (Bluetooth Low Energy) central module
MIT License
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Missing poweredOn event (at least in Ubuntu 24.04) #4

Open rgillan opened 3 weeks ago

rgillan commented 3 weeks ago

Pulling through from here: https://github.com/abandonware/noble/issues/341

rgillan commented 3 weeks ago

confirmed with the quick start that the event never happens:

var noble = require('@stoprocent/noble');

noble.on('stateChange', async (state) => {
  console.log('stateChange:' + state);
  if (state === 'poweredOn') {
    await noble.startScanningAsync();
  }
});

noble.on('scanStart', () => { console.log('scanStart'); });
noble.on('scanStop', () => { console.log('scanStop'); });

noble.on('discover', async (peripheral) => {
  await noble.stopScanningAsync();
  await peripheral.connectAsync();
  const {characteristics} = await peripheral.discoverSomeServicesAndCharacteristicsAsync(['180f'], ['2a19']);
  const batteryLevel = (await characteristics[0].readAsync())[0];

  console.log(`${peripheral.address} (${peripheral.advertisement.localName}): ${batteryLevel}%`);

  await peripheral.disconnectAsync();
  process.exit(0);
});
Apollon77 commented 3 weeks ago

Same question As in matter.js ...

Are capabolities set correctly? https://github.com/stoprocent/noble?tab=readme-ov-file#running-without-rootsudo-linux-specific ... else try if it works with sudo then it is about this.

rgillan commented 3 weeks ago

@Apollon77 we have tested both with and without setcap (as non root) and even running directly as root still has the same issue. This approach (set_cap_raw) is also extremely insecure as it gives this unsolicited access to any nodejs process in the machine, but that is a secondary issue for us at this point, we're just trying to get things functional and it appears that this is where it's failing on newer OS/node environments. And for completeness:

#getcap /usr/bin/node
/usr/bin/node cap_net_raw=eip
Apollon77 commented 3 weeks ago

Which kernel the newest Ubuntu uses? Could it be related to https://github.com/abandonware/node-bluetooth-hci-socket/issues/60#issuecomment-2197545245

stoprocent commented 2 weeks ago

Hi Guys

I will have a look but this week is impossible for me. I still have to fix what @Apollon77 was mentioning above and I also plan to do this at the same time and we can test after.