Friday, October 6, 2017

Third Visit to Vanuatu

The past month has been flat out, and I have spent more of it in Vanuatu than at home in Australia.  I am now back in Vanuatu on our fourth visit, and figured I really had better write about our third visit, before I get even further behind, especially since my wife has already started blogging about this fourth visit on her blog.

One of the things that has delayed me blogging more has been the highly variable nature of mobile internet we are experiencing here in Vanuatu.  It is possible that part of the problem is that our mobile phones don't support the local 4G frequency, however that shouldn't stop the 3G from working. What we often see is that the data signal seems to disappear, or even when it is there, the throughput drops to zero, or very close to it.  Basically between 6 am - midnight it is pot luck as to whether the internet will work at our accommodation, despite having full signal strength, and being able to eye ball the local phone tower.  I might have to ask our in-country contacts in the telecommunications industry for clues on this at some point.  But in the meantime, it means that our opportunities to upload photos and generally edit blog posts are severely impaired, as you can sense from my wife's frustrations. Indeed, here I am at 1:30am writing this post, for exactly this reason.

[Update: For some reason our phones won't do 3.5G / HSPDA+.  It isn't a FairPhone2 specific problem, as Matthew's completely different phone does the same thing.  We have since bought a cheapish Samsung from a local store, which does 3.5G (and soon 4G) on the local network without problem, largely solving our internet problem.]

Of course, this is all further motivation for us to get Serval working, so that communities for whom even annoyingly variable internet is only a pipe-dream. And let's not even mention the spate of cyclones, earthquakes and naughty volcanoes around the place that also keep reminding us of why we are working on this problem.

But, first, lets go over what we got up to on the previous visit here to Vanuatu.

Working with the Smart ICT Sistas

As part of our efforts to engage all aspects of community in the pilot project, we ran a number of sessions with the Smart ICT Sistas, a school-age group for girls and young women to develop an interest and skills in ICT.  This was really interesting from a number of fronts.  

This particular Smart ICT Sista was especially keen and active, asking lots of good questions, and giving all sorts of things a try.

It was great to see some young local people engaging with our technology, to help us work out what works, and what does not in the local context. A couple of key items emerged from this process: 

(1) Android phones in Vanuatu almost exclusively have enable installation from untrusted sources enabled by the time we get to see them, because sharing apps from phone to phone is a very common occurrence in Vanuatu, as people save on internet costs.  As a result, it wasn't long before we were watching the girls transfer the Serval Mesh app from phone to phone:

The Smart ICT sistas getting started with the Serval Mesh
(2) We found that the listen before talk settings on the Mesh Extenders were too strict for effective use in urban areas of Vanuatu, where 900MHz point-to-point links are common.  We simply would not have found this out, were we not working with the Sistas, and using space provided by the very kind and supportive folks from the Vanuatu national telecommunications regulator (the TRR).  Their office is on the 2nd floor in central Port Vila, and seems to be in the direct path of a number of 900MHz point-to-point beams.  They also have a very nice spectrum analyser with direction finder antennae, so we were able to confirm that the problem was a very high noise floor (approximately -50dBm) due to directional 900MHz links.

It goes without saying, but Vanuatu is a very pretty place, and we keep on seeing many beautiful and interesting things as we go about our field work here. Here is the local tourist sailing boat that you can pay to be part of the crew of for a few days:

Then it was off to inspect and pay for the 10m mast, that we are hoping to install in Pang Pang, or possibly on top of a hill between Pang Pang and Epau villages, so that we can link them via Mesh Extender:

I was ably assisted by not only Matthew Lloyd, but also by our two French exchange students, Robin and Raphaël, who also made friends with our neighbours in the SIL compound through their cooking skills.

Raphaël, myself and Robin, working on the Mesh Extender firmware.

We also started work on prototyping a satellite-broadcast bridge for Serval, as part of our HIF grant (more on that in up-coming posts).  We are building this into a proof-of-concept low-cost tsunami/cyclone early warning system, that would provide weather forecasts and other useful information via Serval year-round, so that  they won't become so easily neglected. Our key piece of progress so far, is working out that we can put the 12cm patch antennae inside a poly-carbonate box, and still receive the satellite signal.  This will make it much easier to cheaply make well-protected enclosures.  We will have to see how it behaves in wet weather, as well.

Outernet receiver, with antenna in the grey box. The angle just happens to be close enough with the antenna wedged in the box, and the box sitting flat, which is most convenient.

Then it was time to go around to Pang Pang village again ...

... and go through the University's human ethics approval requirements of obtaining informed concent from the community, before we collect any data.

Places like Pang Pang continue to remind me of the importance that people place on communications. Even though the village itself lacks cellular coverage, there are multiple places you can buy top-up credit for pre-paid phones in the village:

Once the formalities were over, it was time to install five Mesh Extenders throughout the village to provide adequate coverage.  The goal was to have one Mesh Extender in each of the four distinct parts of the village.  So while some people may need to walk a short way to get within wi-fi range of a Mesh Extender, they shouldn't have to go far.

Here, Donald, the chief's son is installing the solar panel for the Mesh Extender on the chief's house:

Again, the ubiquity of communications and mobile computing devices continues to be amazing.  Here the chief is using his Samsung tablet to take a picture of us, while we take a picture of him.  Again, remember that there is no cellular coverage in the village.

To test out where we needed to put the Mesh Extenders, we attached one to a long bamboo pole, which we then hoisted up attached to the chief's house:

However, we soon found by accident that the extra elevation was not necessary, as the Mesh Extenders were reasonably close to one another (not more than a few hundred metres), and with no really dense vegetation in the way.  We found this out on the second day, because we forgot to bring the extension cable that would allow us to use the bamboo again, and had to resort to putting it onto the roof without any extra elevation:

Then we wandered around the village with a second battery-powered Mesh Extender and laptop to verify that the signal was getting through:

The third day we knew where we wanted to install the Mesh Extenders, so together with Donald, we did exactly that.  In keeping with our desire that the local communities drive the process as much as possible, we left the physical installation to Donald, who I might add is very adept with a chainsaw. Here he is making pieces of 2x2 from a piece of 2x4 very accurately, using only the chainsaw:

First up, one Mesh Extender on the chief's house. You can see the elbow shape attachment that Donald used in most cases. If you look very closely, you can see that the nails that attach it to the house beam are not nailed all the way in: This is to allow it to be easily removed when a cyclone comes, so that it can avoid damage, and be put back out again quickly after.  A very simple and very Vanuatu solution to the problem of cyclones.

Here is the Mesh Extender itself cable-tied to the 2x2 post on the roof:

Roughly the same process was followed at the other locations, resulting in Mesh Extenders installed on the roofs of five houses over an area of about 1km long by a couple of hundred metres wide.

This was all finished at about 4:30pm the night before flying out at 7am, leaving no time to install the app on people's phones, or to show them how to use it.  That would have to wait for our fourth visit, which is now half complete.


  1. Hello! What make and model is the rugged tablet you are sporting? Thank you!

  2. It's a Dell Rugged Extreme 12" 2-in-1 laptop/tablet:

    They aren't cheap, but so far has been excellent. I have the i7 version with 32GB of RAM, and performance is very good. Works fine with Ubuntu 16.04.


  3. Can I help you ? I'm a french ISP working with mesh networks for 15 years. My little company is called ATTILOG ( and I'm tired of it ;-) I would like to be useful to people who really needs it. I'm also a sailor if it can help. I hope to ear from you soon.

  4. Can I help you ? I'm a french ISP working with mesh networks for 15 years. My little company is called ATTILOG ( and I'm tired of it ;-) I would like to be useful to people who really needs it. I'm also a sailor if it can help. I hope to ear from you soon.