Here is my very simple and complete sketch.
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
void setup() {
delay(1000);
Serial.begin(115200);
Serial.println();
WiFi.begin("ssid", "password"); //Edited out
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("Connected! Ip: " + WiFi.localIP());
}
void loop() {
}
The serial output is as follows:
...
I would expect to see "Connected! Ip: 192.168.2.xxx" but for some reason the application isn't showing this.
I can ping the device if I scan which new devices entered the wifi net work, and the SSID and password data are correct (I've edited them out here).
Also, the only reason it should stop printing dots is because the state is now connected.
Edit: The output from Serial.setDebugOutput(true);
scandone
..ip:192.168.2.15,mask:255.255.255.0,gw:192.168.2.254
.
Here it shows that it does get connected.
It ends up getting fixed by adding .toString(), like this:
Serial.println("Connected! Ip: " + WiFi.localIP().toString());
Related
Connectivity handling is a major part of firmware development in ESP32 and I've found event based reconnect to work well. Here is the code that you find very commonly everywhere, but it doesn't directly work -
#include <WiFi.h>
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";
void WiFiStationConnected(WiFiEvent_t event, WiFiEventInfo_t info){
Serial.println("Connected to AP successfully!");
}
void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info){
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info){
Serial.println("Disconnected from WiFi access point");
Serial.print("WiFi lost connection. Reason: ");
Serial.println("Trying to Reconnect");
WiFi.begin(ssid, password);
}
void setup(){
Serial.begin(115200);
// delete old config
WiFi.disconnect(true);
delay(1000);
WiFi.onEvent(WiFiStationConnected, SYSTEM_EVENT_STA_CONNECTED);
WiFi.onEvent(WiFiGotIP, SYSTEM_EVENT_STA_GOT_IP);
WiFi.onEvent(WiFiStationDisconnected, SYSTEM_EVENT_STA_DISCONNECTED);
WiFi.begin(ssid, password);
Serial.println();
Serial.println();
Serial.println("Wait for WiFi... ");
}
void loop(){
delay(1000);
}
It doesn't directly work because you are using the Arduino framework. The event constants are for ESP-IDF if I am not wrong.
We need to use the following constants which are specific for Arduino:
ARDUINO_EVENT_WIFI_STA_CONNECTED: ESP32 station connected to AP
ARDUINO_EVENT_WIFI_STA_GOT_IP: ESP32 station got IP from connected AP
ARDUINO_EVENT_WIFI_STA_DISCONNECTED: ESP32 station disconnected from AP
So the correct working code would be:
#include <WiFi.h>
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";
void WiFiStationConnected(WiFiEvent_t event, WiFiEventInfo_t info){
Serial.println("Connected to AP successfully!");
}
void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info){
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info){
Serial.println("Disconnected from WiFi access point");
Serial.print("WiFi lost connection. Reason: ");
Serial.println("Trying to Reconnect");
WiFi.begin(ssid, password);
}
void setup(){
Serial.begin(115200);
// delete old config
WiFi.disconnect(true);
delay(1000);
WiFi.onEvent(WiFiStationConnected,ARDUINO_EVENT_WIFI_STA_CONNECTED);
WiFi.onEvent(WiFiGotIP, ARDUINO_EVENT_WIFI_STA_GOT_IP);
WiFi.onEvent(WiFiStationDisconnected, ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
WiFi.begin(ssid, password);
Serial.println();
Serial.println();
Serial.println("Wait for WiFi... ");
}
void loop(){
delay(1000);
}
I am currently having a problem with my ESP8266 establishing a stable connection to my mosquitto MQTT broker.
I have moved house and am therefore using a different network.
In the previous network, my ESP ran stably and I had no problems at all. The MQTTserver run on a Raspberry PI 4.
In the new network, as already mentioned, it breaks off every 15-30 minutes (no fixed length of time).
The code is of course adapted to the new network and the IP of the broker.
The code I use is probably the generally known code for connecting to the MQTT server.
I only added some I/O Ports.
Since the code worked without problems in the old network, I first thought that the WLAN connection was failing.
So in the loop I inserted the reestablishment with the WLAN.
But this is running stably:
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
Connecting to Vodafone-947E
.....
WiFi connected
IP address:
192.168.0.52
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
..............
Can it be that my new router simply interrupts the connection after some time? Otherwise, I don't understand what the problem could be.
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
//----------------------------------------------------------------------------------------------------------------------
#define wifi_ssid "xxxxxxx"
#define wifi_password "xxxxxxxxx"
#define mqtt_server "192.168.0.xxx"
//----------------------------------------------------------------------------------------------------------------------
WiFiClient espClient;
PubSubClient client(espClient);
bool status;
const int OutputPin2 = 12;
const int ResetPin = 4;
int ResetCounter =0;
//----------------------------------------------------------------------------------------------------------------------
void setup() {
Serial.begin(9600);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
pinMode(OutputPin2, OUTPUT);
pinMode(ResetPin, OUTPUT);
digitalWrite(OutputPin2, HIGH);
digitalWrite(ResetPin, HIGH);
}
//----------------------------------------------------------------------------------------------------------------------
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
WiFi.begin(wifi_ssid, wifi_password);
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId= "ESP8266-";
clientId += String(random(0xffff), HEX);
// Attempt to connect
delay(100);
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
// ... and resubscribe
client.subscribe("esp3/LED");
} else {
ResetCounter++;
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
Serial.println(ResetCounter);
if (ResetCounter >=5)
{
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
//digitalWrite(ResetPin, LOW);
ResetCounter =0;
}
// Wait 5 seconds before retrying
delay(5000);
}
}
}
//----------------------------------------------------------------------------------------------------------------------
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
}
//----------------------------------------------------------------------------------------------------------------------
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(wifi_ssid);
WiFi.begin(wifi_ssid, wifi_password);
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
//----------------------------------------------------------------------------------------------------------------------
void callback(char* topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String messageTemp;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
client.subscribe ("esp3/LED");
if (strcmp(topic,"esp3/LED")) {
Serial.print("Changing output to ");
if(messageTemp == "on LED"){
Serial.println("on LED");
digitalWrite(OutputPin2, LOW); //Invertiertes Signal
delay(200);
}
else if(messageTemp == "off LED"){
Serial.println("off LED");
digitalWrite(OutputPin2, HIGH);
delay(200);
}
}
}
```
Fortunately, I was able to solve the problem. The reason was that the WLAN signal on the ESP8266 was simply too low. As a result, the ESP was not able to stay on the network permanently. I actually ruled this out because the router is only one room away. The problem is that many routers in the surrounding flats also transmit on the same frequency band and thus influence the signal. I bought a WLAN amplifier (of course this does not improve the situation with the signal overlapping). Now I have no more problems with disconnects from the ESP and this has been the case for 2 days.
I'm trying to make an IOT app. My android side is working good so far, however my ESP8266 is unable to read data from Firebase Database. There is no error while connecting to the internet using onboard ESP8266 though. Can anyone point to a possible error? Thank You
#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>
#define WIFI_SSID "WiFi"
#define WIFI_PASSWORD "xxxxxxxx"
#define FIREBASE_HOST "https://iot.firebaseio.com"
#define FIREBASE_AUTH "xxxxxxxx"
int LED1 = D5;
void setup()
{
Serial.begin(115200);
pinMode(LED1, OUTPUT);
Serial.println('\n');
wifiConnect();
Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
delay(10);
}
void loop()
{
if(WiFi.status() != WL_CONNECTED)
{
wifiConnect();
}
delay(10);
Serial.print("Data from firebase:" + Firebase.getString("LED1") + "\n");
digitalWrite(LED1, Firebase.getString("LED1").toInt());
//digitalWrite(LED1, HIGH);
delay(10);
}
void wifiConnect()
{
WiFi.begin(WIFI_SSID, WIFI_PASSWORD); // Connect to the network
Serial.print("Connecting to ");
Serial.print(WIFI_SSID); Serial.println(" ...");
int teller = 0;
while (WiFi.status() != WL_CONNECTED)
{ // Wait for the Wi-Fi to connect
delay(1000);
Serial.print(++teller); Serial.print(' ');
}
Serial.println('\n');
Serial.println("Connection established!");
Serial.print("IP address:\t");
Serial.println(WiFi.localIP()); // Send the IP address of the ESP8266 to the computer
}
For anyone encountering this issue. I got it working by removing the forward slash '/' at the end and the https:// from the start of Host Address.
At the line:
#define FIREBASE_HOST "https://iot.firebaseio.com"
you should fix to:
#define FIREBASE_HOST "iot.firebaseio.com"
I need to send my data to firebase via NODE MCU. I've created an application that is used to turn on and off led in node mcu. My node mcu connects with the wifi network but does not send data to firebase. The if(firebase.failed()) executes, but does not return an error code. In the serial monitor it just prints setting/number failed:. How can I fix this?
#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>
#include <ArduinoJson.h>
#define FIREBASE_HOST "http://temphu*****.firebaseio.com/"
#define FIREBASE_AUTH "VblTNS************OmWTW6n"
#define WIFI_SSID "A****"
#define WIFI_PASSWORD "9*****"
#define LED 2
void setup() {
pinMode(LED,OUTPUT);
digitalWrite(LED,0);
Serial.begin(9600);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.print("connecting");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println();
Serial.print("connected: ");
Serial.println(WiFi.localIP());
Firebase.begin(FIREBASE_HOST,FIREBASE_AUTH);
Firebase.setInt("LEDStatus",0);
}
void loop() {
if(Firebase.getInt("LEDStatus")) {
digitalWrite(LED,HIGH);
}
else {
digitalWrite(LED,LOW);
}
if (Firebase.failed()) { // Check for errors
Serial.print("setting /number failed:");
Serial.println(Firebase.error());
return;
}
delay(1000);
}
In the source code it clearly says that (https://raw.githubusercontent.com/FirebaseExtended/firebase-arduino/master/src/FirebaseError.h) two error codes are used in addition to regular HTTP error codes. Therefore Firebase rejection might not raise an error even though it fails.
So check the firebase rules and change read/write to true.
I am trying to access a simple web page running in my Rpi-server using ESP8266 and Arduino.
I have refereed this similar SO question , but it's not the solution for my problem.
Here is my current Arduino Code :
#include "WiFiEsp.h"
// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2,3); // RX, TX
#endif
char ssid[] = "RPi"; // your network SSID (name)
char pass[] = "raspberry"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
char server[] = "192.168.50.1";
// Initialize the Ethernet client object
WiFiEspClient client;
void setup()
{
// initialize serial for debugging
Serial.begin(9600);
// initialize serial for ESP module
Serial1.begin(9600);
// initialize ESP module
WiFi.init(&Serial1);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data
Serial.println("You're connected to the network");
printWifiStatus();
Serial.println();
Serial.println("Starting connection to server...");
// if you get a connection, report back via serial
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make a HTTP request
client.println("GET /simple.html HTTP/1.1");
client.println("Host: 192.168.50.1");
client.println("Connection: close");
client.println();
}
}
void loop()
{
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if the server's disconnected, stop the client
if (!client.connected()) {
Serial.println();
Serial.println("Disconnecting from server...");
client.stop();
// do nothing forevermore
while (true);
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("Signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
Output:
Starting connection to server...
[WiFiEsp] Connecting to 192.168.50.1
Connected to server
[WiFiEsp] Data packet send error (2)
[WiFiEsp] Failed to write to socket 3
[WiFiEsp] Disconnecting 3
My simple.html looks like this.
<html>
<body>
<p>1</p>
</body>
</html>
}
I accessed to this page from web browser and it shows the content properly.
What is missing here?
Thanks in advance.
Try this line in your code
client.print("GET /simple.html HTTP/1.0\r\n\r\n");