Done @Casper! You did me a huge favor by documenting this and I made sure to repay that favor. Check out my new TVDevice which comes with two wiring/code samples. One is using standard IRremoteESP8266 library and 2 IR LEDs with standard wiring like your project where the positive signal is sent to the pin. The other code sample is my slight modification to the IRremoteESP8266 library and the Arduino code which is basically a copy of the 2 LED sample but the library/include reference is what changed. Enjoy and let me know if you have any questions.
https://community.smartthings.com/t/esp8266-nodemcu-arduino-based-tv-remote/50161
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