Roaming between 2 APs with WDS

Avinash Patil avinashapatil at
Fri Oct 10 04:55:00 EDT 2014

Hi Victor,

What is SD8787 FW version you are using?  As I understand from your last
email, roaming is now working fine, right?


On Fri, Oct 10, 2014 at 12:38 PM, Víctor Andrés <victor at>

> Hi Dan.
> Thanks by your help.
> I tested it in a different board and the signal level of the APs were
> correct. At least, not all the same and with a value of -101. May be a
> problem of the chip wifi of that board, I don't know. I use the same
> antenna for the 2 tests, and the boards were in the same position (more or
> less) for the 2 tests (with the same AP locations). I'll continue with the
> tests. I don't understand how can I connect with these APs that the wifi
> have detected with that poor signal.
> I've compiled Wpa-supplicant with bgscan option enabled and tested in a
> different board, and now I have roaming between that 2 APs (with
> bgscan:learn). Now I'm trying to reduce the searching time, because when
> the wireless is searching network it can't transmit data, isn't it?
> Víctor
> El 08/10/2014 19:33, Dan Williams escribió:
>> On Wed, 2014-10-08 at 12:35 +0200, Víctor Andrés Andrés wrote:
>> First, roaming works better with "bgscan" options enabled.  This option
>> tells the supplicant to periodically scan looking for a better AP.  If
>> scans don't happen (either through "bgscan" or manually via the control
>> interface) the supplicant will stick with the current AP until the
>> connection is broken.  The only way the supplicant knows which AP is
>> better is if a scan has taken place and it knows the RSSI of each AP.
>> Second, it looks like the driver is broken for signal strength
>> reporting.  -100dBm signal level is quite awful, and the fact that it
>> shows *all* APs at that level is pretty much a smoking gun.  This is the
>> reason the supplicant won't switch APs even if you do trigger a manual
>> scan, because no AP really has a better signal level than the current
>> one.
>> (one other slight possibility: your antenna isn't connected very well,
>> or isn't connected at all, and you're close to the APs...)
>> Dan
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