From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <00a101c4c029$2c66e730$2301a8c0@boris> From: =?iso-8859-1?Q?Boris_W=FCst?= To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009E_01C4C031.8A1F3CD0" Subject: [Bluez-devel] Development of a Bluetooth-LAN-Accesspoint Sender: bluez-devel-admin@lists.sourceforge.net Errors-To: bluez-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Date: Mon, 1 Nov 2004 16:40:47 +0100 This is a multi-part message in MIME format. ------=_NextPart_000_009E_01C4C031.8A1F3CD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi folks, still i have more a logical than a technical problem. i hope someone can = help: we (my projectteam) want to develop an bluetooth-lan-accesspoint based = on the BlueTarget-Controller from SND (perhaps someone knows the = controller) for our university. i have thought about to use the = rfcomm-layer to handle the connections and the low level data transfer. = on top of the rfcomm-connections i want to set up an normal = ppp-connection. speaks something against this concept? have anyone a = better solution? now to the problem(s): (1) we want to design an accesspoint that connects automatically to all = bt-devices that are located in its range, so that a lan-access supported = immediately and it's guaranteed that the bt-accesspoint is the master at = all communications? how can we implement an automatic connection = establishment on the rfcomm-layer and how we can make sure that the = bt-accesspoint is always master that parks and activates the devices = automatically depended on the data transfer(so that can be more devices = than 7 connected to the lan)? what do we have to consider with the = authentication? can we avoid it or switch it off at both sides of = connection? when the connections established how we can manage them and = the different channels to the connections? (2) when we use a ppp-connection from bt-devices to the accesspoint, = every device needs an ip and the accesspoint as gateway. how can we = realize the assignment of the ip-adresses an the gateway to the = bt-devices controlled by the accesspoint? the major problem at this = concept is that the BlueTarget-Controller is a pure microcontroller an = provides a own bt-stack. so on it can't be run services how pppd or = pand. but the controller as an lan-interface and must therefor = understand tcp/ip. how we can emulate a ppp-connection with a = bt-stack(bluez) avoiding high expense of development? are there some = documentations and/or program examples about this topic?? have anyone = implemented something compareable?? (3)the last problem is the connection speed. we have set up an test = environment composed of a PDA and a linuxsystem with the bluez-stack and = a bt-usb-donlge. we have only achieved max. 16KB/s at the best = bt-connection qualtity, only one bt-connection and ACL. why can't we = achieve approximately the max. speed (95KB/s) of the connection? how = does it look with serveral connections? share all connections these = 16KB/s? how we can advance the connection-speed? is one possibility to = use more than one rfcomm-connection (more than one channel) for a = ppp-connection? have anyone a solution? i hope you guys can help me with these problems. perhaps also by = documentations of previous projects or links to the web. when someone of = you have a lot of experience in the development in this direction, i = would be grateful when you lend yourself as permanent contact person. = thanks to everyone who helps ;D best regards, Boris p.s.: plz apologize my weird englisch *g* ------=_NextPart_000_009E_01C4C031.8A1F3CD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi folks,

still i have more a logical than a technical problem. i hope someone = can=20 help:

we (my projectteam) want to develop an bluetooth-lan-accesspoint = based on the=20 BlueTarget-Controller from SND (perhaps someone knows the controller) = for our=20 university. i have thought about to use the rfcomm-layer to handle the=20 connections and the low level data transfer. on top of the = rfcomm-connections i=20 want to set up an normal ppp-connection. speaks something against this = concept?=20 have anyone a better solution?

now to the problem(s):

(1) we want to design an accesspoint that connects automatically to = all=20 bt-devices that are located in its range, so that a lan-access supported = immediately and it's guaranteed that the bt-accesspoint is the master at = all=20 communications? how can we implement an automatic connection = establishment on=20 the rfcomm-layer and how we can make sure that the bt-accesspoint is = always=20 master that parks and activates the devices automatically depended on = the data=20 transfer(so that can be more devices than 7 connected to the lan)? what = do we=20 have to consider with the authentication? can we avoid it or switch it = off at=20 both sides of connection? when the connections established how we can = manage=20 them and the different channels to the connections?

(2) when we use a ppp-connection from bt-devices to the accesspoint, = every=20 device needs an ip and the accesspoint as gateway. how can we realize = the=20 assignment of the ip-adresses an the gateway to the bt-devices = controlled by the=20 accesspoint? the major problem at this concept is that the = BlueTarget-Controller=20 is a pure microcontroller an provides a own bt-stack. so on it can't be = run=20 services how pppd or pand. but the controller as an lan-interface and = must=20 therefor understand tcp/ip. how we can emulate a ppp-connection with a=20 bt-stack(bluez) avoiding high expense of development? are there some=20 documentations and/or program examples about this topic?? have anyone=20 implemented something compareable??

(3)the last problem is the connection speed. we have set up an test=20 environment composed of a PDA and a linuxsystem with the bluez-stack and = a=20 bt-usb-donlge. we have only achieved max. 16KB/s at the best = bt-connection=20 qualtity, only one bt-connection and ACL. why can't we achieve = approximately the=20 max. speed (95KB/s) of the connection? how does it look with serveral=20 connections? share all connections these 16KB/s? how we can advance the=20 connection-speed? is one possibility to use more than one = rfcomm-connection=20 (more than one channel) for a ppp-connection? have anyone a = solution?

i hope you guys can help me with these problems. perhaps also by=20 documentations of previous projects or links to the web. when someone of = you=20 have a lot of experience in the development in this direction, i would = be=20 grateful when you lend yourself as permanent contact person. thanks to = everyone=20 who helps ;D

best regards, Boris

p.s.: plz apologize my weird englisch=20 *g*

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