Trying to understand how getpassword works

Hi, I’ve been using your excellent library, and have ported it to python. I’m now trying to figure out getpassword. Perhaps you could explain how it works (I’m just working on the fw V2 version).

I can get the blid, no problem. This is the crucial part of the code:

const packet = 'f005efcc3b2900';
  var client = tls.connect(8883, host, {rejectUnauthorized: false}, function () {
    client.write(new Buffer(packet, 'hex'));
  });

  client.on('data', function (data) {
    if (data.length === 2) {
      sliceFrom = 9;
      return;
    }
    if (data.length <= 7) {
      console.log('Error getting password. Follow the instructions and try again.');
    } else {
      console.log('Password=> ' + new Buffer(data).slice(sliceFrom).toString() + ' <= Yes, all this string.');
      console.log('Use this credentials in dorita980 lib :)');
    }

So what I would like to know is where ‘f005efcc3b2900’ comes from? I’m sending it as hex, and I get back two bytes ‘f023’ - what are you supposed to get back? is this an error code?

The other mystifying bit is:

if (data.length === 2) {
      sliceFrom = 9;

How can you slice from 9 if the data length is 2? Anyway, I’m assuming I should get more back than this, maybe I’m sending the "magic packet’ incorrectly, and I’m getting an error code back.

Any tips or suggestions would be welcomed.

[NickWaterton]

Thanks for the info, this explains a lot. So the magic packet is 7 bytes long, correct? I ask because the JavaScript description of Buffer(string, ‘hex’) is confusing. I will try reading two packets if the first is just two bytes long (which is what I’m currently getting).

To get the password, I’m opening a raw TLS socket connection, but in the actual Python roomba class, I’m using Paho mqtt client with a TLS connection.

The Python class is working, I’ve just been putting the final touches to my live map drawing section.

The last part was how to get the password, so the Python library was fully featured.

I will post the code on my github, but I was waiting until I had all the bugs out before I posted. I’ll let you know when it’s up.

On a different note, any idea which ports roomba uses for firmware updates? I’m worried about an update closing off our mqtt access, but if I block all ports, the cloud service can’t connect. I don’t know if they are using the mqtt port for upgrades, but I would suspect not, more likely they are downloading over 433 (you could upgrade over mqtt though…). If I block 433, the cloud service is cut off, so that is used as part of the cloud service, but the same is true of 8883. Probably a combo of the two.

Anyway, thanks for the help.

[koalazak]

No idea about the upgrade process 😕