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fix: join the AP our scan picked without rescanning every channel

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Every WiFi connect took about 17.6 s.  Our scan already picks the AP and
passes its BSSID and channel to WiFi.begin(), but the connect still ran
with WIFI_ALL_CHANNEL_SCAN.  So the driver swept every channel again
before it sent the first auth frame.  A capture of the join showed the AP
silent for 17.6 s, the radio on ch7 while the AP is on ch6, and then
auth, association and the handshake all done in 80 ms.

When the BSSID is known (the normal connect, the strongest-AP path and
roaming), use WIFI_FAST_SCAN: the driver starts on that channel and joins
the first match, and with bssid_set only that AP matches.  The hidden-SSID
path still uses the all-channel scan, since there it is what finds the
strongest AP (rstrouse/ESPSomfy-RTS#294).  Soft reboots now connect in
0.3-1.5 s.

Also log how long each join took and the AP's security mode, on the
connect line and on the roaming-scan lines, so a slow connect shows up.

One boot in the old logs connected in 2.47 s, and nothing in its log
explains it.  After a power cut the first attempts can still fail on the
AP side; a soft reboot sends a deauth first and doesn't have that problem.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
cjkas 2026-10-19 16:00:12 +02:00
parent e963a5adb3
commit 6d1e9064c2
4 changed files with 57 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/Utils.cpp
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@ -147,6 +147,20 @@ void RssiBroadcast::sent(bool broadcast, int rssi, int channel, uint32_t now) {
bool worthRoaming(bool connected, int currentRssi, int apRssi, int minGain) {
return !connected || apRssi >= currentRssi + minGain;
}
const char *wifiAuthModeName(uint8_t authMode) {
switch(authMode) {
case 0: return "OPEN";
case 1: return "WEP";
case 2: return "WPA";
case 3: return "WPA2";
case 4: return "WPA/WPA2";
case 5: return "WPA2-ENT";
case 6: return "WPA3";
case 7: return "WPA2/WPA3";
case 8: return "WAPI";
default: return "UNKNOWN";
}
}
heap_emit_t heapEmitTarget(uint8_t num, uint32_t sinceLastMs, uint32_t intervalMs, bool roomHasClients) {
if(num != 255) return heap_emit_t::client;
if(sinceLastMs >= intervalMs) return heap_emit_t::broadcast;