Tag Archives: mozilla

“The disconnected ensemble”, at JSConf.Budapest

Here I am in Budapest (for the first time ever 😮)! I’m back in the hotel after having a quick dinner on my own. I didn’t join the party because I had a massive headache and also I was getting so sleepy, no coffee could fight that (also probably the two things were related). But once I started wandering towards my hotel I found myself feeling so much better, and stumbled upon a cosy nice place and ended up stopping there for some food.

When I came back from the speakers’ dinner yesterday, I practiced setting up all my stuff and going through the demos again, which are in fact ran on real, physical devices, i.e. phones.

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Running a web server on the front-end

The introduction of TCP sockets support in Firefox OS made it possible to run a web server from the front-end, and all is written in JavaScript. Think of having something similar to express.js… but running on a browser (because after all, Firefox OS is a superturbocharged browser).

Again, JS server superstar Justin d’Archangelo wrote an implementation of a web server that works on Firefox OS. It’s called fxos-web-server and it includes a few examples you can run.

None of the examples particularly fit my use case–I want to serve static content from a phone to other phones, but the examples were a bit more contrived. So I decided to build a simpler proof-of-concept example: catserver, a web server that served a simple page with full screen Animated GIFs of cats:

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Getting logs of your Firefox OS device

Often you want to output debugging data from your app, but the space on the screen is limited! And perhaps you don’t want to connect to the app with WebIDE and launch the debugger and etc, etc…

One solution is to use any of the console. functions in your code. They will be sent to the device’s log. For example:

console.log('hello friends!');

and you can also use console.error, console.info, etc.

Then, if you have the adb utility installed, you can get instant access to those logs when your device is connected to your computer with USB.
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install-to-adb with command line tool!

As I said, I abhor repetition, so I added a new nifty feature to the install-to-adb module I made.

Now it also has a command line tool, and you can push and launch apps from the command line without even having to write a custom script that uses the module (of course, you can still use the module code by requiring it).

install-to-adb /path/to/your/firefoxos/app --launch

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Enabling Wi-Fi direct on your rooted Firefox OS device

I’m doing some research and playing with this new-ish API which is available in Firefox OS on rooted phones with Certified apps etc etc. Guillaume wrote a post on the Hacks blog–read it if you’re interested in what can be accomplished.

The very first thing you need to do is to enable Wi-Fi direct on the device. This involves running some commands as root, via adb. Justin made a gist which worked with Flame phones, but it didn’t work with a Nexus 4, because of the way the /system partition is mounted on those phones.

A (more?) fail-proof way should be this:

adb shell "mount -o rw,remount /system"
adb shell "stop b2g"
adb shell "echo \"ro.moz.wifi.p2p_supported=1\" >> /system/build.prop"
adb shell "mount -o ro,remount /system"
adb reboot

this will add a line to the /system/build.prop file and reboot the device.

Once it’s rebooted, the result of navigator.mozWifiP2pManager.enabled should be true, which is GOOD NEWS!

Remember that you need to run that code in

  1. a certified app
  2. request the wifi-manage permission in the manifest

So essentially your manifest.webapp MUST contain the following fields in addition to the rest of fields you usually have:

  "type": "certified",
  "permissions": {
    "wifi-manage": "for wi-fi direct"