Re: [PATCH] wifi: Choose a random channel when opening an ap

[HENRIET Vivien <vivien.henriet@overkiz.com>]

Hi Daniel,

Could you have a look to this patch?

I would like to be able to open the WiFi AP on different channel.
The simplest way to do it, is to select a random channel, which fit my need.
Do you think its acceptable to integrate this way?

I've got also other ideas to achieve the same goal:
- Add an optional channel parameter when opening the AP
- Add a global config to set the channel
- ...

What do you think?

Best regards,
Vivien

Le 23/09/2021 à 14:44, Vivien Henriet a écrit :
> When the tethering mode is started, a WiFi ap is created using the fixed
> channel 1 (2412 MHz). There is no way to configure this channel.
>
> This patch make connman choose a random channel every time the ap is created.
> ---
>   plugins/wifi.c | 10 +++++++++-
>   1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/plugins/wifi.c b/plugins/wifi.c
> index 578b4be7..936f1750 100644
> --- a/plugins/wifi.c
> +++ b/plugins/wifi.c
> @@ -3344,11 +3344,19 @@ static GSupplicantSSID *ssid_ap_init(const char *ssid, const char *passphrase)
>       if (!ap)
>               return NULL;
>
> +     /**
> +      * Choose a random channel in the range 1-11. Channels 12-14 are not
> +      * available worlwide.
> +      * Channels within this range are spaced 5 MHz apart from each other.
> +      */
> +     int channel = (rand() % 11) + 1;
> +     int freq = 2407 + channel * 5;
> +
>       ap->mode = G_SUPPLICANT_MODE_MASTER;
>       ap->ssid = ssid;
>       ap->ssid_len = strlen(ssid);
>       ap->scan_ssid = 0;
> -     ap->freq = 2412;
> +     ap->freq = freq;
>
>       if (!passphrase || strlen(passphrase) == 0) {
>               ap->security = G_SUPPLICANT_SECURITY_NONE;


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