Re: Connecting three basix-bt-400m to one laptopmaster

Brad, Jaya,
  I have been having this very same issue for quite sometime.  For my
setup I use Gumstix Connex 400xm-bt motherboards (with pba31308 v1.01 BT
radios).  I have a piconet configured with one master and 6 slaves.  I
was using Gumstix's "buildroot" and bluez 2.24, but then moved to "OE",
so now I use Bluez 3.24.  This same problem occurs with both of these
environments.

  I have researched this quite abit and I have tried many different
"hcid" configurations.  My standard "hcid" configuration is exactly like
the one that Brad recommended.  BTW, I have posted a number of requests
for help on this forum and on the Bluez forums, but have not had anyone
respond until now.  So I am definitely grateful to have you helping out
Brad!

  So far the only conclusion that I have come to is that this has to do
with the "role switch" procedure not working properly.

  For example; for my setup I have the slave devices initiate the
connection with the piconet master device.  Once the connection is
established, a role switch should occur automatically (based upon the
configuration).  If, after the ACL connection is established, the slave
does not perform the role switch with the master, then it's "lm" state
remains as MASTER and then only two of the six slaves will ever achieve
an ACL connection with the piconet master device.

  The only way that I have been able to ensure a high degree of success
with getting all 6 slaves to connect properly is to montior the ACL
connections (via hcitool con) and to force a role switch in the cases
where it does not occur automatically.

  Thank you again, Brad, for helping out with this.  Can you please
provide me with greater details for "role switch" procedure?

Thanks!

Mark

-----Original Message-----
From: Brad Midgley [mailto:bmidgley@...]
Sent: Saturday, May 17, 2008 1:36 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Connecting three basix-bt-400m to one
laptopmaster

Jaya

You're also running pretty old stuff on that laptop. It looks like
you're doing everything else right. Things might work right on a newer
distro.

Brad

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