I’m Not Crying, You Are

The WiFi professionals community defines that word – community. We have an incredibly active Twitter presence, we have conferences, we have Field Day, we have our own vernacular, we have shared pain unique to our niche. We call each other by our first names and not Twitter handles. It’s a specialty with its own very different challenges. It’s a dual discipline job, half RF nerd and half Network bit jockey. Because of the unique challenges and the tight-knit aspects of the industry anyone in the trenches, I dare say, would answer anyone else’s phone call.

Perhaps the highest honor in this community is the CWNE (Certified Wireless Network Expert) from the excellent training and certification organization, CWNP (Certified Wireless Network Professionals). Why is it the highest? Every other expert level certification in the industry is a combination of proctored tests, some including live labs. They are hard, most of them DAMN hard. CWNE combines four of these tests – difficult ones, with a BUNCH of other stuff. The other stuff is why I’m elated to have been conferred with this thing.

You have to do Pearson-Vue tests, the hard ones. There is the CWNA for table stakes. It’s called an administrator test, it’s an engineer test, flat and simple. Then there’s the CWAP, which is the DEEP packet analysis test. That one nearly killed me in prep. Then the CWDP, the design test. Then the CWSP, the security test. They are 90 minute 60 question tests. You need a 70% to pass. The CWNA/CWSP were a bear when I first got them in 2004. They are as tough now, even having done this kind of work for all of those intervening years (they expired after 3 years and I hadn’t renewed).

So when you pass those it’s all just getting started. Next is three endorsements from people in the field. You also need two other valid certifications, not from CWNP. You have to have three years of verifiable experience specifically in WiFi. You then write three essays of 500-1000 words about projects you’ve worked. Next comes the painful part. You zip it all up and send it to the CWNP. Then you hold your breath for several weeks. You also check your email obsessivly, wake up in cold sweats and annoy your friends as your imposter syndrome goes in to overdrive. During this extended misery the CWNE Board of Advisors does a peer review. They have the opportunity to ask clarifying questions and generally validate that you are worthy of conferral.

Eventually you get an email. If you are me, you basically hang up on your work partner and call your wife crying.

I’ve passed hard tests that span eight hours. I’ve gotten certifications that require verified experience and a long wait. I’ve not, until now, had a certification that involved such subjective validation of my work by my peers and betters. I may still have imposter syndrome, but it has eased up a tiny bit.

 

WLAN Pi Battery Testing


Man, I love this little guy.  I have mentioned it before, I will do it again…and again….and again.  It is so incredibly easy to drop on a network, see the IP pop up on the OLED and start iPerf3 to check network speeds, get speeds from ePerf in your  Ekahau site survey,  use a graphical speed test, use HORST to grab packets, launch Kismet to see the WLANs around, have an endpoint for WiFi Explorer Pro, or add anything else a Raspberry Pi can run to customize it.  I’ll follow up with the junk I have added to mine at a later date.

One shortcoming of the current crop of Single Board Computers, including the one used in the WLAN Pi, is the lack of real PoE.  Some can use the phony bologna “passive PoE”  a certain prosumer WiFi vendor uses, but who has time for such nonsense?   You end up having to either use a USB PoE splitter or add a hat to the device.  Bummer.  The nice thing is that they draw very little power.  One great way to pop one up quickly is to just use a USB battery pack.  Rather than dealing with the splitters or finding wall power, I’ve found the battery pack to be a quick and easy solution.  I carry one anyway, and my bag is pretty full, so why not use it?  I like everything possible in my backpack to have at least two uses.  I don’t have any other reason to carry a USB PoE splitter.

I have amassed many of these battery packs over the years as charging technologies have changed.  I harbor a mild obsession with using the fastest possible charging technology for my current phone.  Most recently that is the Pixel 2 XL, which uses USB Power Delivery as does my Macbook.  The battery packs I used are specifically because I am most likely to have one of them in my bag (I also obsessively re-organize my bag so it can change depending on the day).  I hope to test with some others if I can pull them from my son’s hands.

First the setup – I used a WLAN Pi running  WLAN Pi v1.3 (Released 06-03-2018).  I had the Comfast CF-912AC in it, plugged into one of my Aruba switches.  I booted it and immediately started Kismet to make sure the WLAN adapter was being used.  I then started a ping from one of my servers with a timestamp (used this on Windows) and let it sit and cook.

The first battery I tested was my light and quick one.  It’s an Auckley (not to be confused with Auckey) 10,000 mAh pack that is actually pretty slim.  Now that I have a phone with a decent battery I carry it with me most of the time.  It’s just a little oomph if I am in a single meeting and need to make sure I have enough juice.  It is USB-PD and works fairly well for a generic. It was one of the only PD packs on the market for quite a while, so I went with the generic.  Most that do PD are gigantuon (like the second one I tested).

So, the Auckley actual gave me 14 hours 22 minutes of use!  If you need to be running this thing for THAT long straight, you’ve got big issues.  REALLY impressive.  These things sip power through a Capri Sun straw.

The second battery was my big daddy (he loves it when you call him Big Papa).  The RavPower 26,800 mAh is a BEAST.  This is the one I carry on planes or when I am going to be in meetings all day.  As one would expect, it lasted an amazingly long time.  I got 32 hours and 13 minutes out of it, using the same testing!

Mathing out the draw vs the capacity of the battery is one thing.  As you can see testing with all the variables is quite another.  I hope this helps give a feel for how long you can run these amazing little devices on the battery pack you probably already have with you!