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v42: Wi-Fi diagnostics when no known network is reachable #15

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v42: Wi-Fi diagnostics when no known network is reachable #15

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24 changes: 22 additions & 2 deletions firmware/scanner/scanner.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -362,7 +362,7 @@ static volatile uint32_t g_bytesGeschrieben = 0; // since the last processing
static uint32_t g_naechsterVersuch = 0; // 0 = due immediately
static int g_versuche = 0;

#define FW_VERSION "v41"
#define FW_VERSION "v42"

String cfgEndpoint;
// Known WiFi networks - several, so the same stick runs at different locations.
Expand Down Expand Up @@ -1720,6 +1720,11 @@ static String g_apKennung; // BSSID of the chosen access point
static int g_apKanal = 0;
static long g_apRssi = 0;
static uint32_t g_wlanVerloren = 0; // since when without a network (0 = connected)
// Why did the last connection attempt fail? Set by the WiFi event task, read and
// logged from the main loop (no String work in the event task). 0 = nothing yet.
// Codes: 2 auth expired, 15 4-way handshake timeout (wrong password), 201 no AP
// found, 202 auth failed, 203 association failed, 204 handshake timeout.
static volatile int g_wifiTrennGrund = 0;
#define WLAN_NEUSUCHE 120000 // this long without a network, then search again

// Several access points can carry the same SSID (single APs, no mesh), and the
Expand Down Expand Up @@ -1752,7 +1757,19 @@ static void wlanStarten()
g_apKanal + " with " + g_apRssi + " dBm, IP " + WiFi.localIP().toString());
} else {
g_apKennung = "";
logZeile("[wifi] no known network reachable");
logZeile(String("[wifi] no known network reachable, status ") + (int)WiFi.status() +
", last disconnect reason " + g_wifiTrennGrund);
// Diagnosis (21.09.2026: a stick with correct credentials would not join
// the home network it had used the day before): what does the scan see?
int n = WiFi.scanNetworks(false, false, false, 300);
for (int i = 0; i < n && i < 12; i++) {
bool bekannt = false;
for (int k = 0; k < cfgNetze; k++) if (cfgNetzSsid[k] == WiFi.SSID(i)) bekannt = true;
logZeile(String("[wifi] seen: \"") + WiFi.SSID(i) + "\" " + WiFi.BSSIDstr(i) + " ch" + WiFi.channel(i) +
" " + WiFi.RSSI(i) + " dBm auth " + (int)WiFi.encryptionType(i) + (bekannt ? " KNOWN" : ""));
}
if (n <= 0) logZeile(String("[wifi] scan returned ") + n);
WiFi.scanDelete();
}
}

Expand Down Expand Up @@ -3075,6 +3092,9 @@ void setup()

// WiFi only now: the scan blocks for a few seconds, and the printer
// should see the stick as a drive right away, not only after the WiFi.
WiFi.onEvent([](WiFiEvent_t, WiFiEventInfo_t info) {
g_wifiTrennGrund = info.wifi_sta_disconnected.reason;
}, ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
wlanStarten();
if (WiFi.status() != WL_CONNECTED) {
einrichtungStarten(cfgNetze ? "no known network in range" : "no network configured");
Expand Down
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