My issue is similar to the topic:Wifi Was not declared in this scope? - Programming Questions - Arduino Forum, except that I am using ESP8266WiFi.h but still receiving error error: 'wifi_station_get_reconnect_policy' was not declared in this scope.
Details are:
Arduino: 1.8.5 (Windows 8.1), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 4M (1M SPIFFS), v2 Lower Memory, Disabled, None, All Flash Contents, 115200"
C:\Users\labpc 7\Documents\Arduino\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp: In member function 'bool ESP8266WiFiSTAClass::getAutoReconnect()':
C:\Users\labpc 7\Documents\Arduino\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp:364:46: error: 'wifi_station_get_reconnect_policy' was not declared in this scope
return wifi_station_get_reconnect_policy();
^
Multiple libraries were found for "ESP8266WiFi.h"
Used: C:\Users\labpc 7\Documents\Arduino\libraries\ESP8266WiFi
Not used: C:\Users\labpc 7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\libraries\ESP8266WiFi
exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
.
I am using the following code:
/*
Basic ESP8266 MQTT example
This sketch demonstrates the capabilities of the pubsub library in combination
with the ESP8266 board/library.
It connects to an MQTT server then:
- publishes "hello world" to the topic "outTopic" every two seconds
- subscribes to the topic "inTopic", printing out any messages
it receives. NB - it assumes the received payloads are strings not binary - If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,
else switch it off
It will reconnect to the server if the connection is lost using a blocking
reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
achieve the same result without blocking the main loop.
To install the ESP8266 board, (using Arduino 1.6.4+):
- Add the following 3rd party board manager under "File -> Preferences -> Additional Boards Manager URLs":
http://arduino.esp8266.com/stable/package_esp8266com_index.json - Open the "Tools -> Board -> Board Manager" and click install for the ESP8266"
- Select your ESP8266 in "Tools -> Board"
*/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
const char* ssid = "............";
const char* password = ".............";
const char* mqtt_server = "broker.mqtt-dashboard.com";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
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(".");
}
randomSeed(micros());
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*);*
- }*
- 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 acive 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...");*
- // Create a random client ID*
- String clientId = "ESP8266Client-";*
- clientId += String(random(0xffff), HEX);*
- // Attempt to connect*
- if (client.connect(clientId.c_str())) {*
- Serial.println("connected");*
- // Once connected, publish an announcement...*
- client.publish("outTopic", "hello world");*
- // ... and resubscribe*
- client.subscribe("inTopic");*
- } else {*
- Serial.print("failed, rc=");*
- Serial.print(client.state());*
- Serial.println(" try again in 5 seconds");*
- // Wait 5 seconds before retrying*
- delay(5000);*
- }*
- }*
}
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 loop() { - if (!client.connected()) {*
- reconnect();*
- }*
- client.loop();*
- long now = millis();*
- if (now - lastMsg > 2000) {*
- lastMsg = now;*
- ++value;*
- snprintf (msg, 75, "hello world #%ld", value);*
- Serial.print("Publish message: ");*
- Serial.println(msg);*
- client.publish("outTopic", msg);*
- }*
}
I am trying to use mqtt to retrieve data from dht11 using esp8266.
Can anyone help me on this issue?
