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feat: log AP signal levels and roam for a 6 dB gain

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The roaming scan found two APs for the SSID every 10 minutes but the log
never showed their signal, so there was no way to tell whether the
device at -70 dBm had a better AP to move to. Log each AP on the
roaming scans, show roams at info level, and switch for a 6 dB gain
instead of 10.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
cjkas 2026-10-11 20:50:46 +02:00
parent f1eac31957
commit bd7ed17a97
2 changed files with 15 additions and 4 deletions
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17
src/ESPNetwork.cpp
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@ -111,11 +111,11 @@ void ESPNetwork::loop() {
if(this->getStrongestAP(settings.WIFI.ssid, bssid, &channel)) {
if(!WiFi.BSSID() || memcmp(bssid, WiFi.BSSID(), sizeof(bssid)) != 0) {
if(!this->connected()) {
ESP_LOGD(TAG, "Connecting to AP %02X:%02X:%02X:%02X:%02X:%02X CH: %d", bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5], channel);
ESP_LOGI(TAG, "Connecting to AP %02X:%02X:%02X:%02X:%02X:%02X CH: %d", bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5], channel);
this->connectWiFi(bssid, channel);
}
else {
ESP_LOGD(TAG, "Found stronger AP %02X:%02X:%02X:%02X:%02X:%02X CH: %d", bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5], channel);
ESP_LOGI(TAG, "Found stronger AP %02X:%02X:%02X:%02X:%02X:%02X CH: %d", bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5], channel);
this->changeAP(bssid, channel);
}
}
@ -538,8 +538,9 @@ uint32_t ESPNetwork::getChipId() {
return chipId;
}
bool ESPNetwork::getStrongestAP(const char *ssid, uint8_t *bssid, int32_t *channel) {
// The new AP must be at least 10dbm greater.
int32_t strength = this->connected() ? WiFi.RSSI() + 10 : -127;
// The new AP must be at least ROAM_MIN_GAIN_DB stronger.
const bool connected = this->connected();
int32_t strength = connected ? WiFi.RSSI() + ROAM_MIN_GAIN_DB : -127;
int32_t chan = -1;
memset(bssid, 0x00, 6);
esp_task_wdt_delete(NULL);
@ -548,6 +549,14 @@ bool ESPNetwork::getStrongestAP(const char *ssid, uint8_t *bssid, int32_t *chann
esp_task_wdt_add(NULL);
for(int16_t i = 0; i < n; i++) {
if(WiFi.SSID(i).compareTo(ssid) == 0) {
// Only on the roaming scans, so the log shows whether a better AP is
// around without filling up while we scan to reconnect.
if(connected) {
const uint8_t *b = WiFi.BSSID(i);
const uint8_t *cur = WiFi.BSSID();
ESP_LOGI(TAG, "AP %02X:%02X:%02X:%02X:%02X:%02X ch %ld %ld dBm%s", b[0], b[1], b[2], b[3], b[4], b[5],
(long)WiFi.channel(i), (long)WiFi.RSSI(i), (cur && memcmp(b, cur, 6) == 0) ? " (connected)" : "");
}
if(WiFi.RSSI(i) > strength) {
strength = WiFi.RSSI(i);
memcpy(bssid, WiFi.BSSID(i), 6);