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I guess there will be a question about high packet loss in receiver node.

Last time, I also tried to do the same thing. Normally, a board may support either RFO or PA_BOOST but not both. I tried the PA_BOOST, and set TX_Power also....

@tausday By right, when setting setTxPower, REG_PA_DAC should already be either 0x87 or 0x84. https://github.com/sandeepmistry/arduino-LoRa/blob/master/src/LoRa.cpp#L447 I also see the same effect like you. But I always feel +10dBm difference is...

I hit the same issue for esp32. When I put the packetSNR outside the ISR, the issue was gone. Wonder how it affects Arduino boards? Could you create a pull...

I remember packetSNR works fine in ISR for my esp32. Only packetFrequencyError hits issue for me in ISR.

Should always avoid to use GPIO 0 and 2 for ESP board.

It seems that you are trying to display something on OLED (error line 18) while receiving data in LoRa (error line 8). If yes, then don't do so. In on...

Never process heavy stuffs in ISR onReceive(). Actually, inside ISR onReceive, it is recommended to set a flag only. Then in loop you check for the flag, process and send...

Try to use external 3.3v power for LoRa. Nano is known for lacking of power output for LoRa (up to 100-120mA)

"Not working" means can still send/receive in implicit mode but the header is still there? Could you make the payload a bit longer like 16 and 32 bytes and check...