[Bluez-devel] Setting up two connections at the same time

[Herman Meerlo <herman@service2media.com>]

Hi All,

I am trying to develop an application which performs an inquiry and will 
then perform a service search on the found devices using multiple 
threads. This fails however because these threads all try to setup a 
connection at the same time which is not possible off course. I have 
traced the problem down to the HCI layer which sends a Command Status 
event for the first Create Connection request indicating that it has 
started the connection setup. But the Command Status event indicates to 
the host that it is ready to receive the next HCI command. However the 
next command in the queue is the second Create Connection request which 
is then sent to the HCI controller. The controller off course rejects 
this request with a status 0x0C (Command Disallowed). This error is 
propagated to the higher layers (l2cap and sdp) and eventually the 
sdp_connect fails with errno set to EBADFD.
What is the best way to handle this situation? The EBADFD doesn't really 
indicate that the application can retry the request. Wouldn't it be 
better to handle this at the host HCI layer? That is the only entity 
which can possibly keep track of the HCI controller state and perform 
the next connection request only when the Connection Complete event from 
the previous request has been received. This way the requests could be 
serialized. Or is this way too complex?

Regards,
Herman Meerlo


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