Scan WiFi with Arduino on ESP32-C3

#include "WiFi.h"

void setup() {
  Serial.begin(115200);

  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  Serial.println("Setup done");
}

void loop() {
  Serial.println("scan start");

  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  if (n == 0) {
      Serial.println("no networks found");
  } else {
      Serial.print(n);
      Serial.println(" networks found");
      for (int i = 0; i < n; ++i) {
          Serial.print(i + 1);
          Serial.print(": ");
          Serial.print(WiFi.SSID(i));
          Serial.print(" (");
          Serial.print(WiFi.RSSI(i));
          Serial.print(")");
          Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN)?" ":"*");
          delay(10);
      }
  }
  Serial.println("");

  delay(5000);
}

BOARD?=esp32:esp32:esp32c3
PORT?=/dev/cu.SLAB_USBtoUART*
BUILD=build
## Pass in V=--verbose to output more information than default

.PHONY: help default lint compile upload clean

default: clean lint compile upload

help: ## Show help message
	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m\033[0m\n"} /^[$$()% 0-9a-zA-Z_-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)

lint: ## Lint code using cpplint
	cpplint --extensions=ino --filter=-legal/copyright,-runtime/int *.ino

compile: ## Compile code and create the firmware binary
	arduino-cli compile $(V) --fqbn $(BOARD) --output-dir $(BUILD) ./

upload: ## Upload the firmware to the board
	arduino-cli upload $(V) --fqbn $(BOARD) --port $(PORT) --input-dir $(BUILD)

clean: ## Remove all built files
	rm -rf build