Could not getWifiDevice (org.freedesktop.NetworkManager was not provided by any .service files)

[diegoribero]

Hey guys

I'm testing this library on a Rpi3, for the sake of testing the module fast I flashed a 2019-04-08-raspbian-stretch-lite.img into the Pi

I wasn't able to install the module following your instructions as stated in issue #7, However, once installed I used the sample server code but it failed with a:
Error: Could not getWifiDevice at new NetworkManagerError (/home/pi/network-api/node_modules/nm-api/dist/nm/index.js:80:23)

Code:

const nm = require(’nm-api’);

const port = Number(process.env.NM_SERVICE_API_PORT);

nm.createHttpServer()
.then((app) => {
  app.listen(port);
  console.log(`NetworkManager HTTP APIs running on port ${port}`);
})
.catch((err) => {
  console.error('Something went wrong when starting nm-api server', err);
});

Rpi3 on 2019-04-08-raspbian-stretch-lite.img
Node: 10.15.3
npm: 6.9.0

[maciekrb]

You would rather want to run this inside of a balenalib node image. You can build a Dockerfile and install from the repo, for instance:

# netmanager/Dockerfile.template
FROM balenalib/%%RESIN_MACHINE_NAME%%-node:8

ENV DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket

RUN apt-get update && apt-get install --yes --no-install-recommends \
    build-essential \
    git \
    python \
  && apt-get clean 
COPY . /app
RUN cd /app && npm install
CMD ["node", "/app/index.js"]

A sample package.json looks like this:

# netmanager/package.json
{
  "name": "netmanager",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "nm-api": "git+https://github.com/balena-io-modules/nm-api.git#master"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

The index.js is pretty much the example code referenced in the nm-api repo:

const nm = require("nm-api");

const port = Number(8081);

nm.createHttpServer()
.then((app) => {
  app.listen(port);
  console.log(`NetworkManager HTTP APIs running on port ${port}`);
})
.catch((err) => {
  console.error('Something went wrong when starting nm-api server', err);
});

You also probably want a docker-compose.yml that enables the dbus communications.

version: '2'

services:
  netmanager:
    labels:
      io.balena.features.dbus: '1'
    build: 
      context: ./netmanager
    restart: always
    ports:
      - "8081:8081" # assumes you are running the HTTP service on this port

[diegoribero]

This worked, thank you very much @maciekrb!
I may have had some configuration issues, it looks like at the time, the wifi device of my Rpi wasn't really due to additional hardware