ESP32 code error doubts for ir sensor code

[alphamike_30]

Hi, I am just starting out with ESP32 microcontroller with a bit of previous experience on working with arduinos. I am currently trying to write a code about ir sensor for connecting esp with wifi. I am getting the following error : Compilation error: invalid conversion from 'int (*)()' to 'int' [-fpermissive]. Please help. Here is my code:

#include <esp_now.h>
#include <esp_wifi.h>
#include <WiFi.h>
//#include <Adafruit_Sensor.h>
//#include <DHT.h>

// Set your Board ID (ESP32 Sender #1 = BOARD_ID 1, ESP32 Sender #2 = BOARD_ID 2, etc)
#define BOARD_ID 2

// Digital pin connected to the DHT sensor
#define ir_pin 25 

// Uncomment the type of sensor in use:
//#define DHTTYPE    DHT11     // DHT 11
//#define DHTTYPE    DHT22     // DHT 22 (AM2302)
//#define DHTTYPE    DHT21     // DHT 21 (AM2301)

//DHT dht(DHTPIN, DHTTYPE);

//MAC Address of the receiver 
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

//Structure example to send data
//Must match the receiver structure
typedef struct struct_message {
    int id;
    int ir;
    int readingId;
 } struct_message;

//Create a struct_message called myData
struct_message myData;

unsigned long previousMillis = 0;   // Stores last time temperature was published
const long interval = 10000;        // Interval at which to publish sensor readings

unsigned int readingId = 0;

// Insert your SSID
constexpr char WIFI_SSID[] = "VESCAMPUS";

int32_t getWiFiChannel(const char *ssid) {
  if (int32_t n = WiFi.scanNetworks()) {
      for (uint8_t i=0; i<n; i++) {
          if (!strcmp(ssid, WiFi.SSID(i).c_str())) {
              return WiFi.channel(i);
          }
      }
  }
  return 0;
}

int readir_sensor(){
  int state = digitalRead(ir_pin);

  if (state == LOW) {
    Serial.println("The obstacle is not present");
  } else {
    Serial.println("The obstacle is present");
  }
  
  // add a delay here depending on the application and sensor being used
  delay(100);
}


//float readDHTTemperature() {
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  // Read temperature as Celsius (the default)
  //float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  //float t = dht.readTemperature(true);
  // Check if any reads failed and exit early (to try again).
  //if (isnan(t)) {    
    //Serial.println("Failed to read from DHT sensor!");
    //return 0;
  //}
  //else {
    //Serial.println(t);
    //return t;
  //}
//}

//float readDHTHumidity() {
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  //float h = dht.readHumidity();
  //if (isnan(h)) {
    //Serial.println("Failed to read from DHT sensor!");
    //return 0;
  //}
  //else {
    //Serial.println(h);
    //return h;
  //}
//}

// callback when data is sent
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
  Serial.print("\r\nLast Packet Send Status:\t");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}
 
void setup() {
  //Init Serial Monitor
  Serial.begin(115200);
 
  // Set device as a Wi-Fi Station and set channel
  WiFi.mode(WIFI_STA);

  int32_t channel = getWiFiChannel(WIFI_SSID);

  WiFi.printDiag(Serial); // Uncomment to verify channel number before
  esp_wifi_set_promiscuous(true);
  esp_wifi_set_channel(channel, WIFI_SECOND_CHAN_NONE);
  esp_wifi_set_promiscuous(false);
  WiFi.printDiag(Serial); // Uncomment to verify channel change after

  //Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  // Once ESPNow is successfully Init, we will register for Send CB to
  // get the status of Trasnmitted packet
  esp_now_register_send_cb(OnDataSent);
  
  //Register peer
  esp_now_peer_info_t peerInfo;
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.encrypt = false;
  
  //Add peer        
  if (esp_now_add_peer(&peerInfo) != ESP_OK){
    Serial.println("Failed to add peer");
    return;
  }
}
 
void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    // Save the last time a new reading was published
    previousMillis = currentMillis;
    //Set values to send
    myData.id = BOARD_ID;
    myData.id = readir_sensor;
    //myData.temp = readDHTTemperature();
    //myData.hum = readDHTHumidity();
    myData.readingId = readingId++;
     
    //Send message via ESP-NOW
    esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
    if (result == ESP_OK) {
      Serial.println("Sent with success");
    }
    else {
      Serial.println("Error sending the data");
    }
  }
}

[horace]

readir_sensor is a function which returns an int - call it so

 myData.id = readir_sensor();

[alphamike_30]

ok, yes it works now, thank you for the help!