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

[Vivien Henriet <v.henriet@overkiz.com>]

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;
-- 
2.32.0