RFCOMM sockets

Hi all,
I have 3 embedded devices with temperature sensor. This devices are 
accessed from a pc with linux reading data with rfcomm socket, isn't 
need to make sdp query for channel because rfcomm channels are 
statically assigned (it's lab equipment).

I need to read the 3 devices almost at same time and I've done a little 
C application using GLib IOChannels and non-blocking socket to read
data from the devices. All works fine but if a device it's off the 
connection to the others it's slow, my impression is it waits timeout 
from the first device.
I can understand why if I have 3 rfcomm connections issued in 
non-blocking way these influences each other.

I'm using BlueZ 3.22 on a debian 4.0 whith kernel version 2.6.22

Thanks

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