input.ino

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266mDNS.h>

#define WIFI_SSID "<removed>"
#define WIFI_PSK "<removed>"

#define GPIO_LED 13
#define GPIO_RELAY 12

uint8_t lamp = LOW;
uint8_t relais = LOW;

void switchLed()
{
	if(lamp == LOW)
	{
		digitalWrite(GPIO_LED, HIGH);
		lamp = HIGH;
	}
	else
	{
		 digitalWrite(GPIO_LED, LOW);
		 lamp = LOW;
	}
}

void setup(void)
{
	Serial.begin(115200);
	delay(5000);
	Serial.println("");

	Serial.setDebugOutput(true);

	WiFi.persistent(false);
	WiFi.mode(WIFI_OFF);
	WiFi.mode(WIFI_STA);
	WiFi.begin(WIFI_SSID, WIFI_PSK);

	WiFi.printDiag(Serial);

	pinMode(GPIO_LED, OUTPUT);
	digitalWrite(GPIO_LED, LOW);

	pinMode(GPIO_RELAY, OUTPUT);
	digitalWrite(GPIO_RELAY, LOW);

	Serial.print("MAC-Address: ");
	Serial.println(WiFi.macAddress());

	Serial.print("\nConnecting to WiFi ");
	Serial.println(WIFI_SSID);
	while (WiFi.status() != WL_CONNECTED)
	{
		delay(500);
		switchLed();
		Serial.print(".");
	}

	Serial.println("Connected");
	Serial.print("IP-Address: ");
	Serial.println(WiFi.localIP());
}

void loop(void)
{
	if(Serial.available())
	{
		if(Serial.find("\n"))
			switchLed();
	}

	delay(50);
}

serialoutput.txt

bcn 0
del if1
usl
mode : null
mode : sta(<removed>)
add if0
Mode: STA
PHY mode: N
Channel: 1
AP id: 0
Status: 1
Auto connect: 1
SSID (6): <removed>
Passphrase (11): <removed>
BSSID set: 0
MAC-Address: <removed>

Connecting to WiFi <removed>
....scandone
state: 0 -> 2 (b0)
.state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
.....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
.....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
.....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....scandone
state: 0 -> 2 (b0)
state: 2 -> 0 (0)
..reconnect
....