fix(wifi): Fix printDiag() when WiFi not initialized

[szerwi]

Description of Change

Initialize local variables at declaration in WiFiClass::printDiag(Print &p) to prevent crash when WiFi is not initialized.
Previously, when WiFi was not initialized, mode could be any value leading to crash when trying to print its value.

Also added NAN value to modes[], as wifi_mode_t can have following values:

typedef enum {
    WIFI_MODE_NULL = 0,  /**< Null mode */
    WIFI_MODE_STA,       /**< Wi-Fi station mode */
    WIFI_MODE_AP,        /**< Wi-Fi soft-AP mode */
    WIFI_MODE_APSTA,     /**< Wi-Fi station + soft-AP mode */
    WIFI_MODE_NAN,       /**< Wi-Fi NAN mode */
    WIFI_MODE_MAX
} wifi_mode_t;

Test Scenarios

Tested on arduino-esp32 v3.3.4 and ESP32 DevKit

Related links

[github-actions]

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[github-actions]

Test Results

 76 files   76 suites   17m 42s ⏱️
 38 tests  38 ✅ 0 💤 0 ❌
241 runs  241 ✅ 0 💤 0 ❌

Results for commit 1076bb5.

♻️ This comment has been updated with latest results.

[github-actions]

Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32C5	0	0	0.00	0.00	0	0	0.00	0.00
ESP32P4	0	0	0.00	0.00	0	0	0.00	0.00
ESP32S3	0	0	0.00	0.00	0	0	0.00	0.00
ESP32S2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32C3	0	0	0.00	0.00	0	0	0.00	0.00
ESP32C6	0	0	0.00	0.00	0	0	0.00	0.00
ESP32H2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32	0	0	0.00	0.00	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32C5		ESP32P4		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32H2		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
libraries/ArduinoOTA/examples/BasicOTA	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/AsyncUDP/examples/AsyncUDPClient	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/AsyncUDP/examples/AsyncUDPMulticastServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/AsyncUDP/examples/AsyncUDPServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/DNSServer/examples/CaptivePortal	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESP32/examples/Time/SimpleTime	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESP_NOW/examples/ESP_NOW_Broadcast_Master	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESP_NOW/examples/ESP_NOW_Broadcast_Slave	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESP_NOW/examples/ESP_NOW_Network	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESP_NOW/examples/ESP_NOW_Serial	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESPmDNS/examples/mDNS-SD_Extended	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/ESPmDNS/examples/mDNS_Web_Server	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Ethernet/examples/ETH_WIFI_BRIDGE	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/FFat/examples/FFat_time	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/Authorization	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/BasicHttpClient	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/BasicHttpsClient	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/CustomHeaders	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/HTTPClientEnterprise	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/ReuseConnection	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPClient/examples/StreamHttpClient	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPUpdate/examples/httpUpdate	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPUpdate/examples/httpUpdateSPIFFS	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPUpdate/examples/httpUpdateSecure	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/HTTPUpdateServer/examples/WebUpdater	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Insights/examples/DiagnosticsSmokeTest	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Insights/examples/MinimalDiagnostics	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/LittleFS/examples/LITTLEFS_time	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Matter/examples/MatterColorLight	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterCommissionTest	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterComposedLights	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterContactSensor	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterDimmableLight	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterEnhancedColorLight	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterEvents	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterFan	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterHumiditySensor	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterLambdaSingleCallbackManyEPs	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterMinimum	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterOccupancySensor	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterOnIdentify	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterOnOffLight	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterOnOffPlugin	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterPressureSensor	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterSmartButton	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterTemperatureLight	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterTemperatureSensor	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/Matter/examples/MatterThermostat	0	0	-	-	0	0	0	0	0	0	0	0	0	0	0	0
libraries/NetBIOS/examples/ESP_NBNST	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientInsecure	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientPSK	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientSecure	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientSecureEnterprise	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientSecureProtocolUpgrade	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientShowPeerCredentials	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/NetworkClientSecure/examples/WiFiClientTrustOnFirstUse	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/PPP/examples/PPP_WIFI_BRIDGE	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/RainMaker/examples/RMakerCustom	0	0	-	-	0	0	0	0	0	0	0	0	-	-	-	-
libraries/RainMaker/examples/RMakerCustomAirCooler	0	0	-	-	0	0	0	0	0	0	0	0	-	-	-	-
libraries/RainMaker/examples/RMakerSonoffDualR3	0	0	-	-	0	0	0	0	0	0	0	0	-	-	-	-
libraries/RainMaker/examples/RMakerSwitch	0	0	-	-	0	0	0	0	0	0	0	0	-	-	-	-
libraries/SD/examples/SD_time	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/SPIFFS/examples/SPIFFS_time	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Update/examples/AWS_S3_OTA_Update	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Update/examples/HTTPS_OTA_Update	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Update/examples/HTTP_Client_AES_OTA_Update	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Update/examples/HTTP_Server_AES_OTA_Update	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Update/examples/OTAWebUpdater	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/AdvancedWebServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/ChunkWriting	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/FSBrowser	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/Filters	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HelloServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HttpAdvancedAuth	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HttpAuthCallback	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HttpAuthCallbackInline	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HttpBasicAuth	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HttpBasicAuthSHA1	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/HttpBasicAuthSHA1orBearerToken	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/Middleware	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/MultiHomedServers	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/PathArgServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/SDWebServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/SimpleAuthentification	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/UploadHugeFile	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/WebServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WebServer/examples/WebUpdate	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/FTM/FTM_Initiator	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/FTM/FTM_Responder	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/SimpleWiFiServer	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WPS	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiAccessPoint	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiBlueToothSwitch	0	0	-	-	0	0	-	-	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiClient	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiClientBasic	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiClientConnect	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiClientEnterprise	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiClientEvents	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiClientStaticIP	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiExtender	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiIPv6	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiMulti	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiMultiAdvanced	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiScan	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiScanAsync	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiScanDualAntenna	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiScanTime	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiSmartConfig	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiTelnetToSerial	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFi/examples/WiFiUDPClient	0	0	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/WiFiProv/examples/WiFiProv	0	0	-	-	0	0	0	0	0	0	0	0	-	-	0	0
libraries/Zigbee/examples/Zigbee_Gateway	0	0	-	-	0	0	0	0	0	0	-	-	-	-	0	0
libraries/SD_MMC/examples/SDMMC_time	-	-	0	0	0	0	-	-	-	-	-	-	-	-	0	0
libraries/ESP32/examples/Camera/CameraWebServer	-	-	-	-	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/Camera/CameraWebServer (2)	-	-	-	-	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/Camera/CameraWebServer (3)	-	-	-	-	0	0	-	-	-	-	-	-	-	-	-	-

[me-no-dev]

This is old API. I suggest you use Serial.println(WiFi.STA);

[szerwi]

This is old API. I suggest you use Serial.println(WiFi.STA);

Is Serial.println(WiFi.STA); same as WiFi.STA.printTo(Serial)?
If yes, then it gives different information than printDiag().

I use both for debugging my app and I have noticed that bug with printDiag(), so I thought I will patch it.

[me-no-dev]

BTW NAN is not enabled