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[bluetooth-dev] IP over Bluetooth - current structure not so clean
I have my reservations about bluetooth's structure, I think it dates pre-IP
domination thinking from Telcos. Voice and voice link links appears to be
the main focus of the standard. It has a connectionless packet data but
this is not used to send arbitary data - as far as I can tell in a normal
profile, just negotiate connections.
Also the cheap frequency hopping approach is not that suitable for
connectionless, data transmission. It's cheaper (I understand) but
in it's present form means that you can potential have long delays
before you discover a device, like up to 10 seconds, from memory.
So you can't do a whole lot of IP like things. Broadcast an IP packet -
like a SNMP trap or ARP or such like in any easy way, when something
goes wrong. First you have to form a pico net, which can take time
and then some, more to negotiate connections, PPP what ever.
With each piconet you can only have 7 devices with one master how how are you
going to have lots of embedded devices next to each other in a house? i.e.
your kitchen area or audio/visual entertainment system? Surely a more
practical system is to establish connectionless links so they can mostly
stay quiet and quickly send data when they have something to say to an
Also if you want to send a message to a particular bluetooth device, how do
you refer to it. Typically in Internet land you have a domain name which
stays relatively constant, an IP address which can change occasionally (but
which DNS will map the domain name to automatically) with the link address
only usable by immeadiate neibours.
For your interest there is a proposal to support automatic IP address
allocation over local links that don't want remote routing.
There is also supposedly an IETF BOF on bluetooth:
but I've not seen a single message on it.
Perhaps Bluetooth version 2 will address some of this stuff.
But this is getting very far from the charter of this list...
Of course these are my personal opinions only.
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