unable to get noble package running

SvenSommer

Platform: Raspberry Pi 3

Node Version: v7.4.0

MagicMirror Version: v2.1.0

Description: For bluetooth integration I would like to add noble to a MM²-module. Whith this package I was able to interact with bluetooth devices when I ran nodejs-scripts without the MM²-framework. When I try to integrate it within the node_helper.js. I’m not able to initialise the blueetoh device.
This is simply done by

var noble = require('noble');

noble.on('stateChange', function(state) {
    if (state === 'poweredOn') {
        noble.startScanning([], true);
        console.log('scanning started...');
    }
    else  {
        noble.stopScanning();
        console.log('scanning stopped.');
    }
});

Within node_helper there is now response, no error message. Just nothing happens.

If I run a script in the same folder, outside of MM²-Framework with

sudo node testscript.js

everytthing is working fine.

Steps to Reproduce:

To test the working testscript:

Enter your module-directory: cd ~/MagicMirror/modules
Clone repository : git clone https://github.com/SvenSommer/MMM-OralB
Enter new directory: cd ~/MagicMirror/modules/MMM-OralB
Install dependencies: sudo apt-get install bluetooth bluez libbluetooth-dev libudev-dev
Install noble module:npm install noble
Exceute testscript:sudo node testscript.js
This should lead to a output like

scanning was started. Everything is working fine.

To test the node_helper:

Excute first five steps from above.
For compatibility reasons run:

cd ~/MagicMirror/modules/MMM-OralB
sudo npm rebuild --runtime=electron --target=1.4.6 --disturl=https://atom.io/download/atom-shell --abi=50

Integrate module in config-file

{
        module: 'MMM-OralB',
        position: 'bottom_left',
},

Start MM², so the module gets loaded.

Expected Results: Same console output: scanning was started. Everything is working fine.

Actual Results: Nothing no output. No error. Pure deadly silence.

Configuration: Here the config.js:

var config = {
	port: 8080,
	ipWhitelist: ["127.0.0.1", "::ffff:127.0.0.1", "::1","::ffff:192.168.188.22"],

	language: 'de',
	timeFormat: 24,
	units: 'metric',

	modules: [
		{
			module: 'alert',
		},
		{
			module: 'clock',
			position: 'center'
		},
		{
			module: 'MMM-OralB',
			position: 'bottom_left',
		},
	]

};

/*************** DO NOT EDIT THE LINE BELOW ***************/
if (typeof module !== 'undefined') {module.exports = config;}

Additional Notes: Next to noble is a module to provide advertising Ble-Services its called bleno (from the same developer). This was successfully integrated in an module by @aschulz90. I tried to adapt to his code to find an error in my code. But this wasn’t helping either.
https://github.com/aschulz90/ble_app_interface

aschulz90

I have tested your module (both in MM and stand-alone) and in both cases i get "scanning was started. Everything is working fine." shown in the console (i use a RaspberryPi 2 with an USB-Bluetooth adapter).

Are you runnung MagicMirror with sudo-rights? If there is no console output, then it indicates, that the bluetooth adapter wasn’t started (no “stateChange”-event).

Is my module fully working for you? I currently can’t think of any reason it should only work in one of the both cases (except for the “version mismatch”-error).

SvenSommer

@aschulz90
Thanks for your effort and you for quick help. After using a totally new image and installing everything again. I finally started the MM² with sudo-rights without using a ssh-connection.
This finally solved my issue.

Via ssh-connection I’m unable to start the MM². I tried DISPLAY=:0 sudo npm start. This caused

> magicmirror@2.1.0 start /home/pi/MagicMirror
> electron js/electron.js

No protocol specified

npm ERR! Linux 4.4.45-v7+
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v6.9.4
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! magicmirror@2.1.0 start: `electron js/electron.js`
npm ERR! Exit status 1
...

Is there a way to start the MM² via ssh with sudo rights?

aschulz90

@SvenSommer

Here the following command is suggested:

DISPLAY=:0 nohup npm start &

OdomLinx

@SvenSommer Late but…
https://github.com/sandeepmistry/noble#running-without-rootsudo
Running without root/sudo
Run the following command:

sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)

This grants the node binary cap_net_raw privileges, so it can start/stop BLE advertising.

Note: The above command requires setcap to be installed, it can be installed using the following:

sudo apt-get install libcap2-bin

This works on my Zero W with Debian Stretch