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----
-title: Wireless sensor networks
-url: wireless-sensor-networks.html
-date: 2013-10-24T12:00:00+02:00
-draft: false
----
-
-Zigbee networks have this wonderful capability to self-heal, which means they
-can reorder connections between them if one of them is inoperable. This works
-our of the box when you deploy them. But you have to have in mind that achieving
-this is not as easy as you would think. None of it is plug&play.  So to make
-your life a bit easier, here are some pointers which, I hope, will help you.
-
-- Be careful when you are ordering your equipment abroad. There are many rules
-  and regulations you need to comply before you get your Xbee radios. What they
-  do is they wait until you prove that you won’t use the technology for some
-  kind of evil take over control of the world project :). For this, they have
-  EAR (Export Administration Regulations) which basically means “This product
-  may require a license to export from the United States.”.
-- I don’t know if this applies for every country, but when we purchased our Xbee
-  radios from Mouser, this was mandatory! What we needed to do was to print out
-  a form and write information about our company and send them a copy via
-  email. With this document, we proved that we are a legitimate company.
-- When you complete your purchase and send all the documentation, you are not
-  clear yet. Then customs will take it from there :). There will be some
-  additional costs. Before purchasing, make sure you have as much information
-  about costs as possible. Because it can get costly in the end.
-- I suggest you use companies from your country. You can seriously cut your
-  costs. Here in Slovenia, the best option so far as I know is Farnell. And
-  based on my personal experience, they rock! All I need to say!
-- Make plans when ordering larger quantities. Do not, I say, do not make your
-  orders in December! :) Believe me! You will have problems with stock they can
-  provide for you. So, we were forced to buy some things from Mouser, which was
-  extremely painful because of all the regulations you need to obey when
-  importing goods from the USA.
-- Make sure that firmware version on your Xbee radios is exactly the same! Do
-  not get creative!!! I propose using templates. You can get template by
-  exporting settings/profile in X-CTU application. Make sure you have enabled
-  “Upgrade firmware” so you can be sure each radio has the same firmware.
-- And again: make plans! Plan everything! In months advanced! You will thank me
-  later :)
-- Test, test, test. Wireless networks can be tricky.
-
-If you are serious, I suggest you buy this book, Building Wireless Sensor
-Networks. You will get a glimpse of how networks work in lumens terms. It is a
-good starting point for everybody who wants to build wireless networks.
-
-**Additional resources:**
-
-- http://www.digi.com/aboutus/export/generalexportinfo
-- http://doresearch.stanford.edu/research-scholarship/export-controls/export-controlled-or-embargoed-countries-entities-and-persons
-- http://www.bis.doc.gov/licensing/exportingbasics.htm
-