For ESP32 Boards - Checks the signal strength of the wifi connection to the router via the RSSI value. (RSSI = Received Signal Strength Indication). When testing the signal strength, the closer the value to 0, the stronger the signal is.

ESP32_wifi_signal_strength_test.ino

// - For ESP32 Boards -
// Checks the signal strength of the wifi connection to the router via the RSSI value. (RSSI = Received Signal Strength Indication)
// When testing the signal strength, the closer the value to 0, the stronger the signal is.

#include "WiFi.h"

const char* ssid     = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  delay(100);
}

void loop(){
  Serial.print("RSSI: ");
  Serial.println(WiFi.RSSI());
  delay(2000);
}