Test on Heltec WiFi OLED Lora V2

Hi,
I have 2 Heltec boards: first one contains the original Heltec example for arduino ide, but i would like to use esp-idf. 
I've tried to deploy your "sender" example to a second board.
I set just same frequency and config pins according Heltec Pinouts
No errors, but no cummunication between 2devices

Any ideas?