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Showing content from https://github.com/crankyoldgit/IRremoteESP8266/issues/1031 below:

[ESP32] Cannot use IRSend along with BLE · Issue #1031 · crankyoldgit/IRremoteESP8266 · GitHub

ESP32 (nodemcu-32s) with Arduino framework

v2.7.2

I can send IR codes from my ESP32 very reliably using this code:

void loop() {
        unsigned long t1 = micros(), t2;
        irsend.sendSony(0x9999, 16, 2);  
        delay(1000);  
        t2 = micros();  
        Serial.printf("round of ir takes %ld micros\n", (t2 - t1));          
    }

it works very good with all the following libraries imported:

#include <Arduino.h>  
#include <BLE2902.h>  
#include <BLEDevice.h>  
#include <BLEServer.h>  
#include <BLEUtils.h>  
#include <IRrecv.h>  
#include <IRremoteESP8266.h>  
#include <IRsend.h>  
#include <IRutils.h>

IRsend is defined in my code as a global variable:
IRsend irsend(18); (using pin D18)

and my setup() method looks like this [relevant code only...]

void setup() {
    Serial.begin(38400);
    pinMode(LED_BUILTIN, OUTPUT);
    digitalWrite(LED_BUILTIN, LOW);
    // BLEDevice::init(NAMESTRING);

   /*
   ... 
   more commented out BLE code
   ...
   */

  irsend.begin();
}

this code (with the BLEDevice::init commented out) runs perfectly without any issues.
as soon as I un-comment this line, I cannot seem to send my IR codes in a reliable fashion. (meaning that on average about 5-10% of the times the code is sent correctly, but most of the times garbage values are seems to be sent.)

To check myself for receiving the correct codes, I use multiple Arduinos and ESP32 with several types of receivers (all work on 38 KHz).

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