Hi Marcel/Lizardo,
On Aug 10, 2011, at 12:17 PM, Marcel Holtmann wrote:
Hi Anderson,
This patch adds a new parameter to mgmt_device_found() to inform
the length of 'eir' pointer.
EIR data from LE advertising report event doesn't have a fixed
length
as EIR data from extended inquiry result event does. We needed to
change mgmt_device_found() so it copies 'eir_len' bytes instead of
HCI_MAX_EIR_LENGTH.
what is the max EIR length for LE? Is it more than with BR/EDR. Or
is it
just variable length?
From page 1735:
"The data consists of a significant part and a non-significant part.
[...] The non-significant part extends the Advertising and Scan
Response data to 31 octets and shall contain all-zero octets."
So actually it is not variable length, it has 31 octets, with the
non-significant part zero padded. BR/EDR EIR, on the other hand is
240
bytes (with zero padding for non-significant part as well)
do we have a deep impact (memory wise) if we always pad this up to
240.
If we do, then we might wanna be smarter here anyway.
The advertising report event has the 'Length' field to inform the
'Data' field length, so I believe it has a variable length.
According to its description, the 'Length' field may vary from 0x00
to 0x1F (31) bytes.
The only drawback I see so far is copying extra ~200 bytes each time
we get a advertising report data.
- Andre
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