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WL1807MOD: Set Frequency Range during Active Scan

user5237784
Prodigy 500 points
Part Number: WL1807MOD

Hi Experts,

We are using WL1807MOD＋WiLink8 in development.

During active scan, 

Is it possible to set the frequency to 11g frequency range only?(2.142GHz~2.472GHz).

Also, is it possible to set the frequency to 11a frequency range only?(5.18GHz~5.7GHz).

If it is possible, can you teach me how to do it?

We are using TI SDK v4.2.0.6、hostpad, wpa_supplicant version : v2.5_devel.

Thank you!

HsinYu Lin

（2.412GHz～2.472GHz）

  • 0
    TI__Mastermind 35795 points

    Hi

    You can probably use 'iw' utility to scan on specific channels :

    https://processors.wiki.ti.com/index.php/OMAP_Wireless_Connectivity_WLAN_Scan

    Thanks
    Saurabh

  • 0 in reply to S
    TI__Prodigy 500 points

    Hi Saurabh,

    Thanks for your information!!

    We have further questions as below. Can you help provide the answer?

    1. Can we use “wpa_supplicant（＋wpa_supplicant.conf）”to limit the range of active scan?

    If we can, can you tell me how to do it?

     

    2. When we were running “iw dev wlan0 scan freq 2412” command, is WL1807MOD sending 2.412GHz only probe request?

    Will WL1807MOD send the probe request under other frequency?

     

     

    When running “wpa_supplicant”, we saw it is outputting probe request under both 11g and 11a.

    We want to limit wave output(Probe request) to 11g only, or 11a only.

     

     3. If we set “passive_scan of wpa_supplicant.conf ” to 1, it will deactivate active scan(Not sending Probe request).

    Is this understanding correct?

    Thank you.

  • 0 in reply to user5237784
    TI__Mastermind 35795 points

    Hi,

    We are not aware of any single command that will limit probe requests to 11a or 11g . For supplicant, customer can specify 'freq_list' parameter ( in wpa_supplicant.conf) and list all frequencies they want the device to operate on - this should also limit probe requests on channels defined under this variable . pls check out wpa_supplicant.conf. As for 'iw' , probe request should be sent only on specified freq . 'passive_scan=1' should disable active scan . Supplicant , iw etc. are open source s/w and we recommend customer run the commands to confirm the behavior.

    Thanks,

    Saurabh