Add Pico W WiFi Scan example

examples/arduino-wifi-scan/README.md

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+How to build PlatformIO based project
+=====================================
+
+1. [Install PlatformIO Core](https://docs.platformio.org/page/core.html)
+2. Download [development platform with examples](https://github.com/platformio/platform-raspberrypi/archive/develop.zip)
+3. Extract ZIP archive
+4. Run these commands:
+
+```shell
+# Change directory to example
+$ cd platform-raspberrypi/examples/arduino-wifi-scan
+
+# Build project
+$ pio run
+
+# Upload firmware
+$ pio run --target upload
+
+# Clean build files
+$ pio run --target clean
+```
+
+## Notes
+
+This example is only intended for the Raspberry Pi Pico W with the [Earle Philhower](https://github.com/earlephilhower/arduino-pico) core.

examples/arduino-wifi-scan/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

examples/arduino-wifi-scan/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

examples/arduino-wifi-scan/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter, extra scripting
+;   Upload options: custom port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env]
+platform = raspberrypi
+framework = arduino
+
+[env:rpipicow]
+board = rpipicow

examples/arduino-wifi-scan/src/main.cpp

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+// Simple WiFi network scanner application
+// Released to the public domain in 2022 by Earle F. Philhower, III
+#include <Arduino.h>
+#include <WiFi.h>
+
+void setup() {
+  Serial.begin(115200);
+}
+
+const char *macToString(uint8_t mac[6]) {
+  static char s[20];
+  sprintf(s, "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+  return s;
+}
+
+const char *encToString(uint8_t enc) {
+  switch (enc) {
+    case ENC_TYPE_NONE: return "NONE";
+    case ENC_TYPE_TKIP: return "WPA";
+    case ENC_TYPE_CCMP: return "WPA2";
+    case ENC_TYPE_AUTO: return "AUTO";
+  }
+  return "UNKN";
+}
+
+void loop() {
+  delay(5000);
+  Serial.printf("Beginning scan at %d\n", millis());
+  auto cnt = WiFi.scanNetworks();
+  if (!cnt) {
+    Serial.printf("No networks found\n");
+  } else {
+    Serial.printf("Found %d networks\n\n", cnt);
+    Serial.printf("%32s %5s %17s %2s %4s\n", "SSID", "ENC", "BSSID        ", "CH", "RSSI");
+    for (auto i = 0; i < cnt; i++) {
+      uint8_t bssid[6];
+      WiFi.BSSID(i, bssid);
+      Serial.printf("%32s %5s %17s %2d %4d\n", WiFi.SSID(i), encToString(WiFi.encryptionType(i)), macToString(bssid), WiFi.channel(i), WiFi.RSSI(i));
+    }
+  }
+  Serial.printf("\n--- Sleeping ---\n\n\n");
+  delay(5000);
+}

examples/arduino-wifi-scan/test/README

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+
+This directory is intended for PIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html