Bluetooth connections with noble

[SvenSommer]

Hey guys,
I need some advice how to get a bluetooth javascript-package running within the MM framework.

I tried to install noble to search for a bluetooth device. As I followed the installation instruction on the linked page, I was able to get the package running in a simple test enviroment.

Unfortunately I wasn’t able to get noble running within the MagicMirror framework.

I tried to install it with npm and several versions of node.js (6.x and 7.x) but got always an error
"Error: Module version mismatch. Expected 50, got 51." [node.js 7.x] or
"Error: Module version mismatch. Expected 50, got 48." [node.js 6.x]
within the bluetooth-hci-socket - part of noble.

I tried rebuilding the noble included packages and tried it also with a clean Magic Mirror installation under node.js 7.x. unfortunately nothing helped.

Starting MagicMirror: v2.1.0
Loading config ...
Loading module helpers ...
No helper found for module: alert.
No helper found for module: clock.
WARNING! Could not load config file. Starting with default configuration. Error found: Error: Module version mismatch. Expected 50, got 51.
Loading module helpers ...
No helper found for module: alert.
No helper found for module: clock.
App threw an error during load
Error: Module version mismatch. Expected 50, got 51.
    at Error (native)
    at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:173:20)
    at Object.Module._extensions..node (module.js:583:18)
    at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:173:20)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object. (/home/pi/MagicMirror/modules/MMM-OralB/node_modules/bluetooth-hci-socket/lib/native.js:3:15)
Whoops! There was an uncaught exception...
Error: Module version mismatch. Expected 50, got 51.
    at Error (native)
    at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:173:20)
    at Object.Module._extensions..node (module.js:583:18)
    at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:173:20)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object. (/home/pi/MagicMirror/modules/MMM-OralB/node_modules/bluetooth-hci-socket/lib/native.js:3:15)

[yawns]

How did you rebuild? Which command did toy use?

[SvenSommer]

Hey @yawns,
I tried to rebuild noble and bluetooth-hci-socket by:

npm uninstall bluetooth-hci-socket 

followed by

 npm install bluetooth-hci-socket 

within the /home/pi/MagicMirror/modules/MMM-OralB/ - folder and also the

npm rebuild bluetooth-hci-socket 

which should to to same.

Same for the hole noble package within the same folder.

[SvenSommer]

with the help of @dfuerst we were able to solve this issue by rebuilding electron with a special version:

sudo npm rebuild --runtime=electron --target=1.4.6 --disturl=https://atom.io/download/atom-shell --abi=50

[yawns]

Great. That’s what I was aiming for.

[SvenSommer]

So noble is working fine. I find all bluetooth devices as expected, as long it’s not running within the MM-framework.

It seems like noble isn’t able to power on the bluetooth adapter on the raspberry pi3 board when started by magicmirror.

Any ideas?

Here is a minimal example:

var noble = require('noble');

console.log('stateChange is: ' + noble.state);
noble.on('stateChange', function(state) {
  console.log('changed state to: ' + noble.state);
  if (state === 'poweredOn') {
    noble.startScanning();
  }else  {
    noble.stopScanning();
  }
});
console.log('stateChange is: ' + noble.state);

leeds to:

stateChange is: unknown
stateChange is: unknown

[dfuerst]

maybe using hcitool with the syntax for pairing a device before would solve this issue, have you tried that?
as far as i understand the rpi3 bluetooth is on, at startup, but you have to pair the devices every startup, unless you use hcitool with the corresponding syntax for direct pairing within your .js

[SvenSommer]

We were able to solve this issue by ruinning the MM² with sudo-right. See here for details.