Here is the code for scanning WiFi network and connecting to the WiFi.
#include<ESP8266WiFi.h>
#include<Arduino.h>
#define USER_SERIAL Serial
const char* ssid = "*****";
const char* pass = "*****";
void setup() {
USER_SERIAL.begin(115200);
searchWifi();
WiFi.mode(WIFI_STA);
WiFi.hostname("ESP-host");
WiFi.setPhyMode(WIFI_PHY_MODE_11G);
WiFi.enableInsecureWEP(true);
WiFi.begin(ssid,pass);
while(WiFi.status() != WL_CONNECTED){
USER_SERIAL.print(".");
delay(1000);
}
USER_SERIAL.print("");
USER_SERIAL.println("WiFi connected");
USER_SERIAL.print("IP Address: ");
USER_SERIAL.println(WiFi.localIP());
WiFi.setAutoReconnect(true);
WiFi.persistent(true);
}
void loop() {
// put your main code here, to run repeatedly:
}
void searchWifi(){
int numberOfNetwork = WiFi.scanNetworks();
USER_SERIAL.println("-----");
for ( int i = 0; i< numberOfNetwork;i++){
USER_SERIAL.print("Network name: ");
USER_SERIAL.println(WiFi.SSID(i));
USER_SERIAL.print("Signal Strength: ");
USER_SERIAL.println(WiFi.RSSI(i));
USER_SERIAL.println("-------------");
}
}
My WiFi is in 11bgn mixed mode, so it means that my connection allow all device to be connected. Moreover, my WiFi router is also have 2,4gHz frequency which is the requirement for ESP8266 to allow connection.
Related
I am trying to connect my ESP32 to my Wifi Router using Arduino IDE but it is not connecting & giving a connection failed or disconnected status. I also confirmed it is scanning all the available Wifi Networks but not connecting to my router. I even tried with another ESP32 board but the problem is still there.
I tried this code below. This code would scan/give the available Wifi networks and it did. Also, I was expecting this code to run smoothly but my ESP32 won't connect to my Wifi router.
#include<WiFi.h>
const char *ssid = "my_SSID";
const char *password = "my_Password";
void setup()
{
Serial.begin(115200);
delay(2000);
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
Serial.println("scan start");
// WiFi.scanNetworks will return the number of networks found
int n = WiFi.scanNetworks();
Serial.println("scan done");
if (n == 0) {
Serial.println("no networks found");
} else {
Serial.print(n);
Serial.println(" networks found");}
// Connect to my network.
WiFi.begin(ssid,password);
// Check Status of your WiFi Connection
int x = WiFi.status(); // If x=3 (Connected to Network) & If x=6 (Disconnected from Network)
Serial.print("WiFi Connection Status is ");
Serial.println(x);
while(WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("WiFi Connection Failed...");
WiFi.disconnect();
WiFi.reconnect(); }
//Print local IP address and start web server
Serial.println("\nConnecting");
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("ESP32 IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {}
1st image shows the output of my serial monitor. 2nd inamge shows the return value for WiFi.status function
Try this code:
#include<WiFi.h>
const char *ssid = "YourSSID";
const char *password = "YourPassword";
void initWiFi() {
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.print("Connecting to WiFi ..");
while (WiFi.status() != WL_CONNECTED) {
Serial.print('.');
delay(1000);
}
Serial.println(WiFi.localIP());
}
void setup() {
Serial.begin(115200);
initWiFi();
Serial.print("RRSI: ");
Serial.println(WiFi.RSSI());
}
void loop() {
// put your main code here, to run repeatedly:
}
I was just having this same issue. I found that, for me, the issue was not in the ESP32. It was the WiFi Router. I had the security on the router set to 'WEP' in the router. When I changed the security to 'WPA2-PSK' the ESP32 device connected right away.
I am using PubSubClient library to subscribe to a server using a nodemcu. I tested the code using cloudMQTT and MQTTlens and it worked fine. In addition to that, I used MQTTlens to check mqtt connection with my pc. In there, I did not specify username and password (I kept blank) and it worked just fine. When I want to connect for a public server (ex: "tcp://11.111.111.111"), does not connect.
code for nodemcu
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
const char* ssid = "*****";
const char* password = "****";
const char* mqttServer = "****";
const int mqttPort = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Connecting to WiFi..");
}
Serial.println("Connected to the WiFi network");
client.setServer(mqttServer, mqttPort);
client.setCallback(callback);
while (!client.connected()) {
Serial.println("Connecting to MQTT...");
if (client.connect("ESP8266Client")) {
Serial.println("connected");
} else {
Serial.print("failed with state ");
Serial.print(client.state());
delay(2000);
}
}
client.publish("topic1", "Hello from ESP8266_tester1");
client.subscribe("topic1");
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived in topic: ");
Serial.println(topic);
Serial.print("Message:");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
Serial.println("-----------------------");
}
void loop() {
client.loop();
}
the result from the serial monitor
Any suggestion is welcome
If you genuinely don't require a username and password then don't use the connect function that expects them:
...
if (client.connect("ESP8266Client")) {
...
I see you are using a fairly generic client id - ESP8266Client. Remember that all clients connecting to a broker must have a unique client id. If you depoyed this sketch to two different devices they would not both be able to connect at the same time.
The problem was with the ip I have provided. IP does not require "tcp://" part. After removing that, the code worked well.
Today I got my NodeMCU and I instantly started with coding. I wanted to connect to my WiFi and to my MQTT server.
I used the PubSub example for this.
In the serial monitor I get the message that I connected successfully with the WiFi, but I get the IP 172.20.10.6. However we have a 192.168... network.
Then when I try to reach my MQTT server it doesn't find it. When I try to give the NodeMCU a static IP it also says connected successfully and shows up the static IP I gave it, but I still can't connect to my MQTT server.
I can't ping the NodeMCU and don't find it in my Smartphone app "Fing".
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
const char* ssid = "myssid";
const char* password = "mypw";
const char* mqtt_server = "192.168.42.131";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
void setup() {
pinMode(BUILTIN_LED, OUTPUT);
// Initialize the BUILTIN_LED pin as an output
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
// Switch on the LED if an 1 was received as first character
if ((char)payload[0] == '1') {
digitalWrite(BUILTIN_LED, LOW);
// Turn the LED on (Note that LOW is the voltage level
// but actually the LED is on; this is because
// it is active low on the ESP-01)
} else {
digitalWrite(BUILTIN_LED, HIGH);
// Turn the LED off by making the voltage HIGH
}
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP8266Client")) {
Serial.println("connected");
// Once connected, publish an announcement...
//client.publish("outTopic", "hello world");
// ... and resubscribe
client.subscribe("mathistest");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
long now = millis();
if (now - lastMsg > 2000) {
lastMsg = now;
++value;
snprintf (msg, 75, "hello world #%ld", value);
}
}
You are most likely having a DHCP failure.
A 172.20.x.x address is a non-routable IP address (see: https://www.lifewire.com/what-is-a-private-ip-address-2625970) and the DHCP code is (likely) using that address when the address assignment fails.
Stepping back, DHCP is most likely failing because you are failing to connect to the Wifi network with the correct SSID and password.
I have programmed to my ESP8266 and subscribed one topic to keep listening messages. This is my graphical view of injecting message to IBM Iot node.
This is my settings of inject view
This is my settings of IBM Iot node.
Here are my logs at Serial Monitor, it is connected and subscribed to cmd channel
So far so good, When I am trying to inject a message to my IBM Iot node then it is not publishing a message, as it is not reaching on serial monitor and no log on debug view. here you can see
Here is source code:
#include <ESP8266WiFi.h>
#include <PubSubClient.h> // https://github.com/knolleary/pubsubclient/releases/tag/v2.3
const char* ssid = "shiv";
const char* password = "manmohan#12345";
#define ORG "2kafk4"
#define DEVICE_TYPE "ESP8266"
#define DEVICE_ID "5CCF7FEED6F0"
#define TOKEN "opKF7v3#8jRM*mGkb_"
char server[] = ORG ".messaging.internetofthings.ibmcloud.com";
char topic[] = "iot-2/cmd/test/fmt/String";
char authMethod[] = "use-token-auth";
char token[] = TOKEN;
char clientId[] = "d:" ORG ":" DEVICE_TYPE ":" DEVICE_ID;
WiFiClient wifiClient;
void callback(char* topic, byte* payload, unsigned int payloadLength) {
Serial.print("callback invoked for topic: "); Serial.println(topic);
for (int i = 0; i < payloadLength; i++) {
Serial.print((char)payload[i]);
}
}
PubSubClient client(server, 1883, callback, wifiClient);
void setup() {
Serial.begin(115200);
Serial.println();
wifiConnect();
mqttConnect();
}
void loop() {
if (!client.loop()) {
mqttConnect();
}
}
void wifiConnect() {
Serial.print("Connecting to "); Serial.print(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.print("nWiFi connected, IP address: "); Serial.println(WiFi.localIP());
}
void mqttConnect() {
if (!client.connected()) {
Serial.print("Reconnecting MQTT client to "); Serial.println(server);
while (!client.connect(clientId, authMethod, token)) {
Serial.print(".");
delay(500);
}
initManagedDevice();
Serial.println();
}
}
void initManagedDevice() {
if (client.subscribe(topic)) {
Serial.println("subscribe to cmd OK");
} else {
Serial.println("subscribe to cmd FAILED");
}
}
I tried to check cloud foundry logs using cf command, here it is https://pastebin.com/dfMaS1Gd
Can anyone hint me what I am doing wrong ? Thanks in advance.
Confirm the device type is correctly specified in your node configuration. Currently the screenshot show 0.16.2 which doesn't seem to match the device type you registered and what is specified in your code.
#include "SPI.h"
#include “WiFiEsp.h”
#include <WiFiEspClient.h>
#include “SoftwareSerial.h”
#include <PubSubClient.h>
#include <WiFiEspUdp.h>
float temp=0;
int tempPin = 0;
int isClientConnected = 0;
char data[80];
char ssid[] = “SSID”; // your network SSID (name)
char pass[] = “PASSWORD”; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio’s status
char deviceName = “ArduinoClient1”;
IPAddress server(xxx,xxx,xxx,xxx); //MQTT server IP
IPAddress ip(192,168,43,200);
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print(“Message arrived [“);
Serial.print(topic);
Serial.print(“] “);
for (int i=0;i<length;i++) {
Serial.print((char)payload[i]);
}
Serial.println("-");
}
// Emulate Serial1 on pins 6/7 if not present
WiFiEspClient espClient;
PubSubClient client(espClient);
SoftwareSerial Serial1(6,7); // RX, TX
void setup(){
Serial.begin(9600);
Serial1.begin(9600);
WiFi.init(&Serial1);
WiFi.config(ip);
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
while (true);
}
while ( status != WL_CONNECTED) {
Serial.print("Attemptingonnect to WPA SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
Serial.print("WiFius : ");
Serial.println(status);
}
//connect to MQTT server
client.setServer(server, 1883);
client.setCallback(callback);
isClientConnected = client.connect(deviceName);
Serial.println("+++++++");
Serial.print("isClientConnected;
Serial.println(isClientConnected);
Serial.print("client.state");
Serial.println(client.state());
if (isClientConnected) {
Serial.println("Connected…..");
client.publish("status","Welcome to ISG");
client.subscribe("isg/demoPublish/rpi/ardTempWarn");
//Not able to recieve for this subscribed topic on Arduino Uno Only if I
//print it returns 1
}
}
void loop() {
temp = (5.0 * analogRead(tempPin) * 100.0) / 1024;
Serial.print(" temp : " );
Serial.println(temp);
Serial.print("client.connected);
Serial.println(client.connected());
if (!client.connected()) {
reconnect();
}
client.publish("isg/demoPublish/ard1/tempLM35",String(temp).c_str());
// able to receive data at other
// clients like RPI,Web using Mosquitto broker
client.loop();
delay(5000);
}
void reconnect() {
Serial.println("Device is trying to connect to server ");
while (!client.connected()) {
if (client.connect(deviceName)) {
} else {
delay(5000);
}
}
}
I am using Arduino Uno R3 and ESP8266-01 as wifi connector.
I have to read temperature data and send to Mosquitto ,MongoDB and Raspberry Pi and receive a data on specific condition for that i have subscribed a topic in Arduino.
I am able to receive data from Arduino to all other clients but I am not able to receive data on Subscribed topic in Arduino. But all other deviced like MongoDB able to receive data from Raspberry Pi.
I have used Arduino Uno R3, ESP8266-01 devices and liberary for to connect and send/receive data WiFiEsp.h, WiFiEspClient.h, WiFiEspUdp.h, SoftwareSerial.h, PubSubClient.h
client.subscribe("topic"); returns 1
Also callback function implemented but not able to get call.
So can any one help me why I am not getting subscribed topic message in Arduino?
I have follow https://sonyarouje.com/2016/03/15/mqtt-communication-with-arduino-using-esp8266-esp-01/#comment-111773
The library that you are using has bug in callback hence it would be better that you use other library my preference would be
https://github.com/vshymanskyy/TinyGSM
this library include almost all variants of SIM800(A,C,L,H,808), variants of SIM900(A,D,908,968), ESP8266 (mounted on arduino), Ethernet shield etc. It worked for me, as same issue bugged me for almost 1-2 weeks but latter was able to receive all subscribed message irrespective of mode of communication(GSM,Ethernet,WiFi)