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Ember Developer Blog (2009)

Notice regarding customer support in late December

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Submitted by Matt Dibb on 22 December 2009 - 1:15pm.

Regarding Ember’s customer support over the next 2 weeks, please note:
Ember’s global offices will be officially closed from 24 December, 2009 (Christmas Eve Day) through 1 January, 2010 (New Year’s Day), so support responses during this period will be limited.

Customers initiating support ticket activity over these 2 weeks should expect longer-than-normal response times (closer to one week turnaround time rather than 2-3 business days) from the Ember Support Team.

Recent portal slowness

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Submitted by Matt Dibb on 9 December 2009 - 1:04pm.

We’ve been receiving feedback from users of the site telling us that the portal has been slower (than usual) lately.

While we’re looking to scale our support portal to a more capable server, the more recent latency issues in loading pages is apparently due to MySQL database issues on our end.

Interference on IEEE 802.15.4 Networks

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Submitted by skip on 4 October 2009 - 6:25pm.

There has been quite a bit of discussion recently on a paper by Brodsky and McConnell on potential denial of service attacks on IEEE 802.15.4 networks. This paper highlights some simple techniques for attacking these networks and cautions on the use of wireless networks for control systems. Although the paper cautions on the use of any wireless, it has been used by some proponents of frequency hopping as a reason not to use non-frequency hopping systems. This is interesting since the authors discuss intentionally jamming these systems.

EM35x kits now available for advance ordering

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Submitted by Matt Dibb on 14 September 2009 - 10:01am.

For those of you looking to place an order for the new EM300 series kits (based on the Ember EM351 and EM357 chips and the EmberZNet PRO 4.0 ZigBee PRO stack), the waiting is over.

We announced the GA of EM35x Development Kits today. The full news release is posted on our www.ember.com site at http://www.ember.com/press_release.html?id=317.

We anticipate high demand, so get your order in early for first availability…

ZigBee Network Performance

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Submitted by skip on 27 April 2009 - 2:46pm.

Over the years I have often had questions on network reliability of customer networks running the standard ZigBee software stack. I typically have answered this with anecdotal evidence and experience but not necessarily hard data. As ZigBee networks expand and are used for more applications, it becomes more important to document some typical behavior so engineers understand what to expect for performance. As new engineers start design cycles using ZigBee they question what level of reliability or what level of network operation can be expected.