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Try finding best BSSID for a SSID #1688

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6f0b20e
Try finding best BSSID for a SSID
MaxineMuster Jun 24, 2025
d607a50
fixing search - rssi are negative numbers, so "higher" is better
MaxineMuster Jun 25, 2025
4961822
fix
MaxineMuster Jun 25, 2025
592b541
fix
MaxineMuster Jun 25, 2025
74f773a
debug logs
MaxineMuster Jun 26, 2025
62d9d0c
moving code
MaxineMuster Jun 26, 2025
f49b043
more debug - try waiting
MaxineMuster Jun 26, 2025
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47 changes: 45 additions & 2 deletions src/hal/ln882h/hal_wifi_ln882h.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,12 @@
#include <lwip/sockets.h>
#include <stdbool.h> // for bool "g_STA_static_IP"

// to
char searchssid[35]; // global var to "know" SSID inside wifi_scan_complete_cb()
char t_bssid[7]; // global var to set "best" BSSID inside wifi_scan_complete_cb()




#define PM_WIFI_DEFAULT_PS_MODE (WIFI_NO_POWERSAVE)

Expand Down Expand Up @@ -147,6 +153,9 @@ void HAL_WiFi_SetupStatusCallback(void (*cb)(int code))

static void wifi_scan_complete_cb(void * arg)
{
// to find minimal RSSI
int actrssi=-5000; // make sure we start with impossible low value, so the first entry is surely higher

LN_UNUSED(arg);

ln_list_t *list;
Expand All @@ -158,11 +167,24 @@ static void wifi_scan_complete_cb(void * arg)
// 1.get ap info list.
wifi_manager_get_ap_list(&list, &node_count);

for (int i=0; i<6; i++) t_bssid[i]=255; // set all entries to "FF" in case no BSSID found
// 2.print all ap info in the list.
LN_LIST_FOR_EACH_ENTRY(pnode, ap_info_node_t, list,list)
{
uint8_t * mac = (uint8_t*)pnode->info.bssid;
ap_info_t *ap_info = &pnode->info;
// try to find "best" BSSID for the SSID "searchssid" - set inside void wifi_init_sta()
if (! strcmp(searchssid,ap_info->ssid)){
LOG(LOG_LVL_INFO, "TEST AP: for SSID=%s found BSSID %02X:%02X:%02X:%02X:%02X:%02X with RSSI=%i ... ", searchssid, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], ap_info->rssi);
if (ap_info->rssi > actrssi) {
for (int i=0; i<6; i++) t_bssid[i]=mac[i];
LOG(LOG_LVL_INFO, "better than prior best RSSI=%i\r\n",actrssi);
actrssi=ap_info->rssi;
}
else {
LOG(LOG_LVL_INFO, "best RSSI=%i is still\r\n",actrssi);
}
}

LOG(LOG_LVL_INFO, "\tCH=%2d,RSSI= %3d,", ap_info->channel, ap_info->rssi);
LOG(LOG_LVL_INFO, "BSSID:[%02X:%02X:%02X:%02X:%02X:%02X],SSID:\"%s\"\r\n", \
Expand Down Expand Up @@ -211,7 +233,7 @@ void wifi_init_sta(const char* oob_ssid, const char* connect_key, obkStaticIP_t
LOG(LOG_LVL_ERROR, "[%s]sta mac get failed!!!\r\n", __func__);
return;
}

for (int i=0; i<6; i++) t_bssid[i]=255; // set all entries to "FF" in case no BSSID found
if (mac_addr[0] == STA_MAC_ADDR0 &&
mac_addr[1] == STA_MAC_ADDR1 &&
mac_addr[2] == STA_MAC_ADDR2 &&
Expand Down Expand Up @@ -245,12 +267,33 @@ void wifi_init_sta(const char* oob_ssid, const char* connect_key, obkStaticIP_t


//3. wifi start
strcpy(searchssid,oob_ssid); // so callback function can find "best BSSID"
wifi_manager_reg_event_callback(WIFI_MGR_EVENT_STA_SCAN_COMPLETE, &wifi_scan_complete_cb);

if(WIFI_ERR_NONE != wifi_sta_start(mac_addr, ps_mode)){
LOG(LOG_LVL_ERROR, "[%s]wifi sta start failed!!!\r\n", __func__);
}

for (int i=0; i<5;i++){
int check=0;
for (int i=0; i<6; i++) check+=(uint8_t)t_bssid[i];
if (check < 6*255) break;
OS_MsDelay(100);
LOG(LOG_LVL_INFO, "TEST AP: wifi_init_sta - waiting for BSSID - i=%i\r\n",i);
}
int check=0;
for (int i=0; i<6; i++) check+=(uint8_t)t_bssid[i];
if (check < 6*255) {
LOG(LOG_LVL_INFO, "TEST AP: for SSID=%s best BSSID found %02X:%02X:%02X:%02X:%02X:%02X\r\n", oob_ssid, t_bssid[0], t_bssid[1], t_bssid[2], t_bssid[3], t_bssid[4], t_bssid[5]);
// if it works, we could use
// for (int i=0; i<6; i++) connect.bssid[i]=t_bssid[i];
// to connect to this BSSID
}
else {
LOG(LOG_LVL_INFO, "TEST AP: check=%i -- BSSID t_bssid = %02X:%02X:%02X:%02X:%02X:%02X\r\n",check, oob_ssid, t_bssid[0], t_bssid[1], t_bssid[2], t_bssid[3], t_bssid[4], t_bssid[5]);

}

connect.psk_value = NULL;
if (strlen(connect.pwd) != 0) {
if (0 == ln_psk_calc(connect.ssid, connect.pwd, psk_value, sizeof (psk_value))) {
Expand All @@ -265,7 +308,7 @@ void wifi_init_sta(const char* oob_ssid, const char* connect_key, obkStaticIP_t

wifi_manager_reg_event_callback(WIFI_MGR_EVENT_STA_CONNECTED, &wifi_connected_cb);
wifi_manager_reg_event_callback(WIFI_MGR_EVENT_STA_CONNECT_FAILED, &wifi_connect_failed_cb);

wifi_sta_connect(&connect, &scan_cfg);
}

Expand Down