add code to ensure that SO_SNDBUF is large enough on client connections,
as was previously done for server mode

the default socket rcvbuf for L2CAP is only 4Kbytes which is only
2 and a bit ethernet packets. Check and increase SO_RCVBUF on startup
so that we have buffers for 10 complete packets, should solve a

the default socket rcvbuf for L2CAP is only 4Kbytes which is only
2 and a bit ethernet packets. Check and increase SO_RCVBUF on startup
so that we have buffers for 10 complete packets, should solve a
reported problem with overruns at higher connection speeds (our L2CAP
does not have any flow control).

(the default can still be adjusted upwards using sysctl)

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after setting the L2CAP link mode in server mode, retrieve the kernels
interpretation of it and check specifically for auth when creating the
service record.

use correct value for 10 Mbps

update to use the new Service Discovery API

rework the channel shutdown code path, each channel now has its own
action to process which separates the server and client code.

The "Service Availability" value in the SDP record should be a number
from 0-255 indicating how much availability the service has, rather
than the "Load Factor (0-7)" as used in the "Class of Device"

The "Service Availability" value in the SDP record should be a number
from 0-255 indicating how much availability the service has, rather
than the "Load Factor (0-7)" as used in the "Class of Device" setting.

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add btpand(8), a Bluetooth PAN daemon