Kill resin-wifi-connect on failed attempt.

wifi-connect.js

import { spawn } from 'child-process-promise';
import readline from 'readline';

export default function wifiConnect(ssid) {
  const promise = spawn('wifi-connect', [`--portal-ssid=${ssid}`]);
  const childProcess = promise.childProcess;

  readline
    .createInterface({
      input: childProcess.stderr,
      terminal: false,
    })
    .on('line', line => {
      // Kill wifi-connect when we fail to connect to the network to restart
      // the connect loop so we can display on-screen feedback to the user.
      // This is a workaround for https://github.com/resin-io/resin-wifi-connect/issues/224.
      if (/Connection to access point not activated/i.test(line)) {
        // Resolves the promise and stops wifi-connect.
        childProcess.kill('SIGTERM');
      }
    });

  return promise;
}

This module will launch resin-wifi-connect and kill the process when an unsuccessful attempt is made. resin-wifi-connect will exit normally with a successful connection.

Once the promise resolves you can ping an external service (ie. google.com) to check whether a connection was successful or failed — at which point you can surface an error message and restart wifi-connect.

The feedback loop for the user is fairly delayed but it's better than no feedback at all.