Pubsubclient: no matching function for call to 'PubSubClient:

Created on 22 Aug 2017  Â·  23Comments  Â·  Source: knolleary/pubsubclient

Arduino: 1.8.4 (Linux), Board: "Adafruit HUZZAH ESP8266, 80 MHz, 115200, 4M (3M SPIFFS)"

mqtt_test.ino:21: error: no matching function for call to 'PubSubClient::PubSubClient(WiFiClient&, const char&, const int&)'
PubSubClient client(wclient, mqtt_server, mqtt_port); //instanciates client object
^
/home/sspence65/sketchbook/mqtt_test/mqtt_test.ino/mqtt_test.ino.ino:21:53: note: candidates are:
In file included from /home/sspence65/sketchbook/mqtt_test/mqtt_test.ino/mqtt_test.ino.ino:2:0:
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:116:4: note: PubSubClient::PubSubClient(const char, uint16_t, std::function PubSubClient(const char, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:116:4: note: candidate expects 5 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:115:4: note: PubSubClient::PubSubClient(const char, uint16_t, std::function PubSubClient(const char, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:115:4: note: candidate expects 4 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:114:4: note: PubSubClient::PubSubClient(const char, uint16_t, Client&, Stream&)
PubSubClient(const char, uint16_t, Client& client, Stream&);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:114:4: note: candidate expects 4 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:113:4: note: PubSubClient::PubSubClient(const char, uint16_t, Client&)
PubSubClient(const char, uint16_t, Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:113:4: note: no known conversion for argument 1 from 'WiFiClient' to 'const char'
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:112:4: note: PubSubClient::PubSubClient(uint8_t, uint16_t, std::function PubSubClient(uint8_t *, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:112:4: note: candidate expects 5 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:111:4: note: PubSubClient::PubSubClient(uint8_t, uint16_t, std::function PubSubClient(uint8_t , uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:111:4: note: candidate expects 4 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:110:4: note: PubSubClient::PubSubClient(uint8_t, uint16_t, Client&, Stream&)
PubSubClient(uint8_t , uint16_t, Client& client, Stream&);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:110:4: note: candidate expects 4 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:109:4: note: PubSubClient::PubSubClient(uint8_t, uint16_t, Client&)
PubSubClient(uint8_t , uint16_t, Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:109:4: note: no known conversion for argument 1 from 'WiFiClient' to 'uint8_t {aka unsigned char}'
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:108:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, std::function PubSubClient(IPAddress, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:108:4: note: candidate expects 5 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:107:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, std::function PubSubClient(IPAddress, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:107:4: note: candidate expects 4 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:106:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, Client&, Stream&)
PubSubClient(IPAddress, uint16_t, Client& client, Stream&);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:106:4: note: candidate expects 4 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:105:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, Client&)
PubSubClient(IPAddress, uint16_t, Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:105:4: note: no known conversion for argument 1 from 'WiFiClient' to 'IPAddress'
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:104:4: note: PubSubClient::PubSubClient(Client&)
PubSubClient(Client& client);
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:104:4: note: candidate expects 1 argument, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:103:4: note: PubSubClient::PubSubClient()
PubSubClient();
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:103:4: note: candidate expects 0 arguments, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:83:7: note: PubSubClient::PubSubClient(const PubSubClient&)
class PubSubClient {
^
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:83:7: note: candidate expects 1 argument, 3 provided
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:83:7: note: PubSubClient::PubSubClient(PubSubClient&&)
/home/sspence65/sketchbook/libraries/PubSubClient/src/PubSubClient.h:83:7: note: candidate expects 1 argument, 3 provided
mqtt_test.ino:24: error: 'MQTT' does not name a type
void callback(const MQTT::Publish& pub) {
^
mqtt_test.ino:24: error: expected unqualified-id before '&' token
void callback(const MQTT::Publish& pub) {
^
mqtt_test.ino:24: error: expected ')' before '&' token
mqtt_test.ino:24: error: expected initializer before 'pub'
void callback(const MQTT::Publish& pub) {
^
mqtt_test.ino:24: error: 'MQTT' does not name a type
void callback(const MQTT::Publish& pub) {
^
mqtt_test.ino:24: error: expected unqualified-id before '&' token
void callback(const MQTT::Publish& pub) {
^
mqtt_test.ino:24: error: expected ')' before '&' token
mqtt_test.ino:24: error: expected initializer before 'pub'
void callback(const MQTT::Publish& pub) {
^
exit status 1
no matching function for call to 'PubSubClient::PubSubClient(WiFiClient&, const char&, const int&)'

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Source
picture sspence65

Most helpful comment

I got same error and I fixed it! The error is this function needs char array and we use String. To solve that error you need to convert this string to char array...

String comsg;
comsg="Connected";

client.publish("/test/confirm", (char*) comsg.c_str());

Good Luck!

picture rohandhananjaya on 26 Aug 2019
👍9 👀1 🎉1 😄1

All 23 comments

Hi,

The PubSubClient doesn't provide a constructor that matches that signature, hence this error.

What sketch are you trying to build?

knolleary picture knolleary on 22 Aug 2017

Hello!
I seem to have the same problem (error message as above) building the sketch at:
http://www.arjunsk.com/iot/esp8266-programming-cloud-mqtt-part-3/
Any idea what can be wrong?

Thanks
Bert

Solvarg picture Solvarg on 15 Oct 2017

I have the same problem (error message as above). Where is the issue?

Bagunda picture Bagunda on 1 Dec 2017

@Bagunda are you sure you've installed this library and not a different fork that has changed the callback signature?

How exactly did you install the library?

knolleary picture knolleary on 1 Dec 2017

@knolleary Download zip.
Unzip folder "pubsubclient-master" to D:\Downloads\Arduino\TestMega_MQTT\libraries.
In ArduinoIDE in settings set folder to D:\Downloads\Arduino\TestMega_MQTT\

Bagunda picture Bagunda on 9 Mar 2018

E:\Organisasi\Santren Koding\ioT\Coonect geeknesia\nyoba_bisa_Bismillah\nyoba_bisa_Bismillah.ino: In function 'void senddata(char, String, char, String)':

nyoba_bisa_Bismillah:33: error: no matching function for call to 'PubSubClient::publish(const char [9], String&)'

client.publish("iot/data",pubString);

                                 ^

E:\Organisasi\Santren Koding\ioT\Coonect geeknesia\nyoba_bisa_Bismillah\nyoba_bisa_Bismillah.ino:33:37: note: candidates are:

In file included from E:\Organisasi\Santren Koding\ioT\Coonect geeknesia\nyoba_bisa_Bismillah\nyoba_bisa_Bismillah.ino:2:0:

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:130:12: note: boolean PubSubClient::publish(const char, const char)

boolean publish(const char* topic, const char* payload);

        ^

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:130:12: note: no known conversion for argument 2 from 'String' to 'const char*'

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:131:12: note: boolean PubSubClient::publish(const char, const char, boolean)

boolean publish(const char* topic, const char* payload, boolean retained);

        ^

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:131:12: note: candidate expects 3 arguments, 2 provided

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:132:12: note: boolean PubSubClient::publish(const char, const uint8_t, unsigned int)

boolean publish(const char* topic, const uint8_t * payload, unsigned int plength);

        ^

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:132:12: note: candidate expects 3 arguments, 2 provided

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:133:12: note: boolean PubSubClient::publish(const char, const uint8_t, unsigned int, boolean)

boolean publish(const char* topic, const uint8_t * payload, unsigned int plength, boolean retained);

        ^

C:\Users\khafiS_Fahrurrozi\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:133:12: note: candidate expects 4 arguments, 2 provided

exit status 1
no matching function for call to 'PubSubClient::publish(const char [9], String&)'

mainshop picture mainshop on 13 Apr 2018

same issue

error in arduino ide:

Arduino: 1.6.7 (Windows 10), Board: "Generic ESP8266 Module, 80 MHz, ck, 26 MHz, 40MHz, DOUT, 1M (64K SPIFFS), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200"

WARNING: Spurious .github folder in 'Adafruit MQTT Library' library
WARNING: Spurious .github folder in 'Adafruit SGP30 Sensor' library
WARNING: Spurious .github folder in 'IRremoteESP8266' library
WARNING: Spurious .github folder in 'aREST' library
ESPsonoff_4CH-v1.01p.ino:79: error: no matching function for call to 'PubSubClient::PubSubClient(WiFiClient&, const char [14], int)'

PubSubClient mqttClient(wifiClient, MQTT_SERVER, MQTT_PORT);

                                                       ^

F:\NODEMCU PROGRAMS\sonoff\ESPsonoff_4CH-v1.01p\ESPsonoff_4CH-v1.01p.ino\ESPsonoff_4CH-v1.01p.ino.ino:79:59: note: candidates are:

In file included from F:\NODEMCU PROGRAMS\sonoff\ESPsonoff_4CH-v1.01p\ESPsonoff_4CH-v1.01p.ino\ESPsonoff_4CH-v1.01p.ino.ino:29:0:

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:116:4: note: PubSubClient::PubSubClient(const char*, uint16_t, std::function 

PubSubClient(const char*, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:116:4: note: candidate expects 5 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:115:4: note: PubSubClient::PubSubClient(const char*, uint16_t, std::function 

PubSubClient(const char*, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:115:4: note: candidate expects 4 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:114:4: note: PubSubClient::PubSubClient(const char*, uint16_t, Client&, Stream&)

PubSubClient(const char*, uint16_t, Client& client, Stream&);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:114:4: note: candidate expects 4 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:113:4: note: PubSubClient::PubSubClient(const char*, uint16_t, Client&)

PubSubClient(const char*, uint16_t, Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:113:4: note: no known conversion for argument 1 from 'WiFiClient' to 'const char*'

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:112:4: note: PubSubClient::PubSubClient(uint8_t*, uint16_t, std::function 

PubSubClient(uint8_t *, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:112:4: note: candidate expects 5 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:111:4: note: PubSubClient::PubSubClient(uint8_t*, uint16_t, std::function 

PubSubClient(uint8_t *, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:111:4: note: candidate expects 4 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:110:4: note: PubSubClient::PubSubClient(uint8_t*, uint16_t, Client&, Stream&)

PubSubClient(uint8_t *, uint16_t, Client& client, Stream&);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:110:4: note: candidate expects 4 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:109:4: note: PubSubClient::PubSubClient(uint8_t*, uint16_t, Client&)

PubSubClient(uint8_t *, uint16_t, Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:109:4: note: no known conversion for argument 1 from 'WiFiClient' to 'uint8_t* {aka unsigned char*}'

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:108:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, std::function 

PubSubClient(IPAddress, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:108:4: note: candidate expects 5 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:107:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, std::function 

PubSubClient(IPAddress, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:107:4: note: candidate expects 4 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:106:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, Client&, Stream&)

PubSubClient(IPAddress, uint16_t, Client& client, Stream&);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:106:4: note: candidate expects 4 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:105:4: note: PubSubClient::PubSubClient(IPAddress, uint16_t, Client&)

PubSubClient(IPAddress, uint16_t, Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:105:4: note: no known conversion for argument 1 from 'WiFiClient' to 'IPAddress'

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:104:4: note: PubSubClient::PubSubClient(Client&)

PubSubClient(Client& client);

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:104:4: note: candidate expects 1 argument, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:103:4: note: PubSubClient::PubSubClient()

PubSubClient();

^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:103:4: note: candidate expects 0 arguments, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:83:7: note: PubSubClient::PubSubClient(const PubSubClient&)

class PubSubClient {

   ^

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:83:7: note: candidate expects 1 argument, 3 provided

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:83:7: note: PubSubClient::PubSubClient(PubSubClient&&)

C:\Users\udayw\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.h:83:7: note: candidate expects 1 argument, 3 provided

ESPsonoff_4CH-v1.01p.ino:82: error: 'MQTT' does not name a type

void callback(const MQTT::Publish& pub) {

                 ^

ESPsonoff_4CH-v1.01p.ino:82: error: expected unqualified-id before '&' token

void callback(const MQTT::Publish& pub) {

                              ^

ESPsonoff_4CH-v1.01p.ino:82: error: expected ')' before '&' token

ESPsonoff_4CH-v1.01p.ino:82: error: expected initializer before 'pub'

void callback(const MQTT::Publish& pub) {

                                ^

exit status 1
no matching function for call to 'PubSubClient::PubSubClient(WiFiClient&, const char [14], int)'

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

udaywankar picture udaywankar on 4 Jun 2018

I have the same problem, calling the subscribe method and passing a string.
no matching function for call to 'PubSubClient::subscribe (String&)'
It's possible only to pass a string constant? I need to index the call

AlbertoRubinelli picture AlbertoRubinelli on 19 Mar 2019

Same. Anyone get this back working?

MKme picture MKme on 30 Mar 2019

same same.

exocode picture exocode on 1 Jun 2019

@exocode thanks for your contribution to the discussion.

What version of PubSubClient have you got? How did you install it? What platform are you using it on?

knolleary picture knolleary on 1 Jun 2019

Hi @knolleary

I'm also getting this error:

error: no matching function for call to 'PubSubClient::publish(const char [19], String)'
client.publish("office/sensor/temp", String((float)temp));

As you can see, I have 2.7 installed. Also tried with 2.6 with same result

image

Windows 10, 64bits. Arduino IDE 1.8.9. ESP8266 ESP-01

vazquezjm picture vazquezjm on 9 Jun 2019

@vazquezjm you are passing a string type as the second argument. There is no such method in this library. You probably want that second arg to be a char* : https://github.com/knolleary/pubsubclient/blob/d2ff771f4a79950fa36e35c4c71e232da4f85f5d/src/PubSubClient.h#L141

knolleary picture knolleary on 9 Jun 2019
👍1

I got same error and I fixed it! The error is this function needs char array and we use String. To solve that error you need to convert this string to char array...

String comsg;
comsg="Connected";

client.publish("/test/confirm", (char*) comsg.c_str());

Good Luck!

rohandhananjaya picture rohandhananjaya on 26 Aug 2019
👍9 👀1 🎉1 😄1

This library doesn't define anything to do with void callback(const MQTT::Publish& pub). You must be using an example from a different library.

knolleary picture knolleary on 27 Aug 2019

I don't understand what you mean. Rather than hijack someone else's issue with your own problem, please raise a new issue if it is related to this library. If you are using a different library, then I can't help.

knolleary picture knolleary on 27 Aug 2019

I downloaded library of yours only sir...I doing project it is very
urgent... kindly help....lib name is pubsubclient master lib ..

On Wed 28 Aug, 2019, 2:14 AM knolleary, notifications@github.com wrote:

I don't understand what you mean. Rather than hijack someone else's issue
with your own problem, please raise a new issue if it is related to this
library. If you are using a different library, then I can't help.

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
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or mute the thread
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.

sujithkumarjp picture sujithkumarjp on 27 Aug 2019

You are using this library, but your sketch is for a different library. All I can say is you should start with the examples this library provides, not whatever code you've copied to get the MQTT::Publish reference in your code. But as I said, do not use someone else's issue for your own problem. I will not reply to you on this issue again. Raise a new issue and provide details of your code if you want any help. It may be urgent for you, but it really isn't for me.

knolleary picture knolleary on 27 Aug 2019

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include //Library can be download below

include //Library can be downloaded below

include //Library can be downloaded below

include

int sensorPin1 = 5;

//int flowPin2 = 4;
//int flowPin3 = 3;
//int flowPin4 = 2;

unsigned long flow1count = 0;
unsigned long flow2count = 0;

define countof(a) (sizeof(a) / sizeof(a[0]))

/* Connecting to existing wifi AP Network */

//char ssid[] = "14CORE"; // your network SSID (name)
//char password[] = "we do what we must, because we can"; // your
network password

/* Make you own stand alone wifi networ accesspoint/
const char ssid = "14CORE";
const char* password = "1234567890";

// Set your IP address for your suitable for your network IP/SEGMENT

IPAddress server(192, 168, 4, 100);

PubSubClient client(server);
String webString = "14CORE | Water Flow Sensor with ESP8266"; // String
to display

// Callback function

void callback(const MQTT::Publish& pub) {
if(pub.payload_string().equals("flow1"))
{
webString = "Flow 2: " + String(flow1count/450.0) + " L"; // Arduino
has a hard time with float to string
client.publish("outTopic",webString);
} else if(pub.payload_string().equals("flow2"))
{
webString = "Flow 2: " + String(flow2count/450.0) + " L";
client.publish("outTopic",webString); // send to someones
browser when asked

  } else

Serial.print("14CORE | Flow Sensor ")
Serial.print("Flow 1 in Liters: ");
Serial.print(flow1count/450.0);
Serial.print("\tFlow 2 in Liters: ");
Serial.print(flow2count/450.0);
Serial.print("\tFlow 1 in pulses: ");
Serial.print(flow1count);
Serial.print("\tFlow 2 in pulse: ");
Serial.println(flow2count);
delay(500);

{
}
Serial.print(pub.topic());
Serial.print(" => ");
Serial.println(pub.payload_string());
}
void setup()
{

Serial.begin(115200);
pinMode(sensorPin1, INPUT_PULLUP);
attachInterrupt(sensorPin1, flow1, CHANGE);
pinMode(flowPin2, INPUT_PULLUP);
attachInterrupt(flowPin2, flow2, CHANGE);
client.set_callback(callback);

// Connect to existing wifi network

WiFi.begin(ssid, password);
Serial.print("\n\r \n\rWorking to connect");

// Wait 5mili for connection

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print("Connecting ")
Serial.print(".");
}

Serial.println("");
Serial.print
Serial.println("14CORE | ESP8266 Server");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());

if (client.connect("14CORE | ESP8266 Liquid Flow Sensor")) {
client.publish("outTopic","flow boot up");
client.subscribe("inTopic");
}
}

void loop()
{
client.loop();
}

void flow1()
{
flow1count +=1;
}

void flow2()
{
flow2count +=1;
}

On Wed 28 Aug, 2019, 2:23 AM knolleary, notifications@github.com wrote:

You are using this library, but your sketch is for a different library.
All I can say is you should start with the examples this library provides,
not whatever code you've copied to get the MQTT::Publish reference in your
code. But as I said, do not use someone else's issue for your own problem.
I will not reply to you on this issue again. Raise a new issue and provide
details of your code if you want any help. It may be urgent for you, but it
really isn't for me.

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
https://github.com/knolleary/pubsubclient/issues/319?email_source=notifications&email_token=ALDQGJX5S7E6ZPVTTOAKMA3QGWH3FA5CNFSM4DXXWGBKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5JCR4Y#issuecomment-525478131,
or mute the thread
https://github.com/notifications/unsubscribe-auth/ALDQGJSUPBIDHH2X4OGXAELQGWH3FANCNFSM4DXXWGBA
.

sujithkumarjp picture sujithkumarjp on 27 Aug 2019

I have mail you kindly help me sir...I was trying...otherwise give link of
the another library...sirrr..it is very much important to me

On Wed 28 Aug, 2019, 2:23 AM knolleary, notifications@github.com wrote:

You are using this library, but your sketch is for a different library.
All I can say is you should start with the examples this library provides,
not whatever code you've copied to get the MQTT::Publish reference in your
code. But as I said, do not use someone else's issue for your own problem.
I will not reply to you on this issue again. Raise a new issue and provide
details of your code if you want any help. It may be urgent for you, but it
really isn't for me.

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
https://github.com/knolleary/pubsubclient/issues/319?email_source=notifications&email_token=ALDQGJX5S7E6ZPVTTOAKMA3QGWH3FA5CNFSM4DXXWGBKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5JCR4Y#issuecomment-525478131,
or mute the thread
https://github.com/notifications/unsubscribe-auth/ALDQGJSUPBIDHH2X4OGXAELQGWH3FANCNFSM4DXXWGBA
.

sujithkumarjp picture sujithkumarjp on 27 Aug 2019

@sujithkumarjp. I asked you not to comment on this issue. Raise a new issue. Any more replies from you on this issue will be removed. If this really is so important to you, you can raise a new issue like I have asked 3 times.

knolleary picture knolleary on 27 Aug 2019

I got same error and I fixed it! The error is this function needs char array and we use String. To solve that error you need to convert this string to char array...

String comsg;
comsg="Connected";

client.publish("/test/confirm", (char*) comsg.c_str());

Good Luck!

This worked for me. I can pass a string value such as "OK" but if I pass something like this...

String ip = WiFi.localIP().toString();

I have to convert ip to the char array and it works.

digthewells picture digthewells on 4 Jan 2020

Hola, me podrias ayudar con esto?, es que estoy haciendo un proyecto de Iot, y me muestra este error luego de que he agregado tu biblioteca, te agradecería mucho si me ayudas, graciasss

C:\Users\Owner\AppData\Local\Temp\arduino_modified_sketch_532223\publish.ino: In function 'void reconnect()':

publish:48:51: error: no matching function for call to 'PubSubClient::connect(const char [10], const char [36], const char [1])'

 if (client.connect(MQTT_CLIENT_NAME, TOKEN, "")) {

                                               ^

In file included from C:\Users\Owner\AppData\Local\Temp\arduino_modified_sketch_532223\publish.ino:5:0:

C:\Users\Owner\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:119:9: note: candidate: bool PubSubClient::connect(String)

bool connect(String id);

     ^

C:\Users\Owner\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:119:9: note: candidate expects 1 argument, 3 provided

C:\Users\Owner\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:131:9: note: candidate: bool PubSubClient::connect(String, String, uint8_t, bool, String)

bool connect(String id, String willTopic, uint8_t willQos, bool willRetain, String willMessage);

     ^

C:\Users\Owner\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:131:9: note: candidate expects 5 arguments, 3 provided

C:\Users\Owner\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:193:9: note: candidate: bool PubSubClient::connect(MQTT::Connect&)

bool connect(MQTT::Connect &conn);

     ^

C:\Users\Owner\Documents\Arduino\libraries\pubsubclient-master\src/PubSubClient.h:193:9: note: candidate expects 1 argument, 3 provided

publish:52:27: error: 'class PubSubClient' has no member named 'state'

   Serial.print(client.state());

                       ^

C:\Users\Owner\AppData\Local\Temp\arduino_modified_sketch_532223\publish.ino: In function 'void setup()':

publish:81:10: error: 'class PubSubClient' has no member named 'setServer'

client.setServer(mqttBroker, 1883);

      ^

publish:82:10: error: 'class PubSubClient' has no member named 'setCallback'

client.setCallback(callback); 

      ^

Se encontraron varias bibliotecas para "WiFi.h"
Usado: C:\Users\Owner\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.4\libraries\WiFi
No usado: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.33.0_x86__mdqgnx93n4wtt\libraries\WiFi
exit status 1
no matching function for call to 'PubSubClient::connect(const char [10], const char [36], const char [1])'

Stormbreaker78 picture Stormbreaker78 on 18 Mar 2020
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