Simple I2C bus scanner with port guessing, not yet working on the NINA

firmware/examples/I2CScannerWithPortGuess/.vscode/arduino.json

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+{
+    "sketch": "I2CScannerWithPortGuess.ino",
+    "output": "build",
+    "board": "espressif:esp32:nina_w10",
+    "configuration": "UploadSpeed=921600",
+    "port": "/dev/ttyUSB0"
+}

firmware/examples/I2CScannerWithPortGuess/.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+            ],
+            "browse": {
+                "limitSymbolsToIncludedHeaders": false,
+                "path": [
+                    "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+                ]
+            },
+            "intelliSenseMode": "clang-x64"
+        }
+    ],
+    "version": 4
+}

firmware/examples/I2CScannerWithPortGuess/.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Arduino",
+            "type": "arduino",
+            "request": "launch",
+            "program": "${file}",
+            "cwd": "${workspaceFolder}",
+            "MIMode": "gdb",
+            "targetArchitecture": "arm",
+            "miDebuggerPath": "",
+            "debugServerPath": "",
+            "debugServerArgs": "",
+            "customLaunchSetupCommands": [
+                {
+                    "text": "target remote localhost:3333"
+                },
+                {
+                    "text": "file \"${file}\""
+                },
+                {
+                    "text": "load"
+                },
+                {
+                    "text": "monitor reset halt"
+                },
+                {
+                    "text": "monitor reset init"
+                }
+            ],
+            "stopAtEntry": true,
+            "serverStarted": "Info\\ :\\ [\\w\\d\\.]*:\\ hardware",
+            "launchCompleteCommand": "exec-continue",
+            "filterStderr": true,
+            "args": []
+        }
+    ]
+}

firmware/examples/I2CScannerWithPortGuess/I2CScannerWithPortGuess.ino

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+/**
+ * This is an I2C scanner for the MakeZurich badge, customized for the NINA Breakout.
+ * based on the original code
+ * available on Arduino.cc and later improved by user Krodal and Nick Gammon (www.gammon.com.au/forum/?id=10896)
+ * and probably others adjusted to serve as test code and example for the badge.
+ * @author Michel Racic
+ **/
+
+#include <Wire.h>
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial);             // Leonardo: wait for serial monitor
+  Serial.println("\n\nI2C Scanner to scan for devices on each GPIO port pair");
+}
+
+// This is a list of all GPIOs, I excluded GPIs as they are not suitable for I2C AFAIK
+// Those are the actual ESP32 pins
+//uint8_t portArray[] = {23, 32, 33, 21, 25, 26, 27, 22, 19, 1, 3, 4, 2, 0, 5, 18, 14, 15, 13, 12};
+// This array is just needed to display the friendly name from the NINA-W102 pinout
+//String portMap[] = {"IO1", "IO5", "IO7", "IO8", "IO16", "IO17", "IO18", "IO20", "IO21", "IO22" "IO23", "IO24", "IO25", "IO27", "IO28", "IO29", "IO31", "IO32", "IO35", "IO36" };
+// Disbled ports as there where strange characters...
+uint8_t portArray[] = {/**23, **//**32, 33, 21, 25, 26,**/ /**27, **//**22,**/ /**19, **//**1, 3, 4, 2,**/ 0, /**5, 18, 14, 15,**/ 13/**, 12 **/};
+String portMap[] = {/**"IO1",**/ /**"IO5", "IO7", "IO8", "IO16", "IO17",**/ /**"IO18",**/ /**"IO20",**/ /**"IO21",**/ /**"IO22" "IO23", "IO24", "IO25", **/"IO27", /**"IO28", "IO29", "IO31", "IO32",**/ "IO35"/**, "IO36" **/ };
+
+void scanPorts() { 
+  for (uint8_t i = 0; i < sizeof(portArray); i++) {
+    for (uint8_t j = 0; j < sizeof(portArray); j++) {
+      if (i != j){
+        Serial.printf("Scanning (SDA : SCL) - %i : %i\n", portMap[i], portMap[j]);
+        //TODO maybe add speed evaluation?
+        Wire.begin(portArray[i], portArray[j], 100000 /** bus speed in Hz **/);
+        check_if_exist_I2C();
+
+      }
+    }
+  }
+}
+
+void check_if_exist_I2C() {
+  byte error, address;
+  int nDevices;
+  nDevices = 0;
+  for (address = 1; address < 127; address++ )  {
+    // The i2c_scanner uses the return value of
+    // the Write.endTransmisstion to see if
+    // a device did acknowledge to the address.
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission();
+
+    if (error == 0){
+      Serial.print("I2C device found at address 0x");
+      if (address < 16)
+        Serial.print("0");
+      Serial.print(address, HEX);
+      Serial.println("  !");
+      nDevices++;
+    } else if (error == 4) {
+      Serial.print("Unknow error at address 0x");
+      if (address < 16)
+        Serial.print("0");
+      Serial.println(address, HEX);
+    }
+  } //for loop
+  if (nDevices == 0)
+    Serial.println("No I2C devices found");
+  else
+    Serial.println("**********************************\n");
+}
+
+void loop() {
+  scanPorts();
+  delay(3000);  
+}