Hi Guillaume, Some comments inline, bracketed by <RCC></RCC>.
Robert On 27/01/2012 12:48 AM, Guillaume Fortaine wrote:
<RCC>In what way is 802.15.4 not open? I can download the standard from the IEEE free of charge: http://standards.ieee.org/getieee802/download/802.15.4-2006.pdf. Maybe I'm missing something, but the second line of [0] says "The primary protocols are IEEE 802.15.4 and 6LoWPAN" and further down the page it goes into some detail about using 802.15.4 over Wi-Fi (802.11)</RCC>Dear Mister Jara, Thank you for your reply.But now with the WPAN such as IEEE 802.15.4 and Bluetooth Low Energy, where we have a constrained frame size, 127 and 27 bytes respectively, we are not only interested in embed the IP stack and reduce the code and memory requirements, we are also interested in reducing the header size, in order to reach the higher payload capability.I perfectly understand your goals. But you made one mistake in your reasoning : you assume that there is a future for IEEE 802.15.4. Not only, IEEE 802.15.4 doesn't provide the openness needed to be supported by strong communities like the Free Software Foundation [0], but also the industry is clearly moving towards Wifi that has the main advantage to be available now :
<RCC>Whilst Wi-Fi undoubtedly has a place in the Internet of Things, the footprint is generally larger than that required for 802.15.4 devices, as is the power. In the above article, it points to the Roving Networks RN-131, which has 128K RAM and 2M ROM. This would not come into the class 2 as defined in http://tools.ietf.org/html/draft-bormann-lwig-guidance-01.</RCC>http://www.slideshare.net/mkovatsc/connecting-things-to-the-web-using-programmable-lowpower-wifi-modules
<RCC>There are plenty of people out there who would disagree with you. My personal view is that the future is about using IPv6 in easily-connectable subnets, thus extending the edge of the Internet to all devices in the home/office/etc. The IETF homenet WG is working along these lines too. We can already build home networks quite easily using Ethernet, Wi-Fi and HomePlug PLC but these tend to be based on MAC bridging; what is needed is an IP-based solution.</RCC>So, on my side, I assume that IEEE 802.15.4 is dead. And I doesn't seem to be the only one :)
Best Regards; [0] http://en.qi-hardware.com/wiki/Ben_WPAN -- Guillaume FORTAINE [email protected] DevOpSpace http://www.devopspace.com +33(0)631.092.519
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