ESP8266 or ESP32 related SPI bus issue solved

[Erik84750]

This LoRa library is written with the standard Arduino Uno SPI bus pinouts. When using ESP8266 or ESP32 related boards then their appropriate SPI pins need to be defined. This definition needs absolutely to be placed in the very first line of void setup().
For example:
LoRa.setPins(csPin, resetPin, DIO0Pin);
defines the chipselect pin as cs, the reset pin as resetPin and the callback interrupt pin as DIO0 (referring to the RFM9x modules).
If this is not done in the first instance than the wrong SPI pins are used and get in conflict with an alternative SPI bus used on the ESP series for their flash memory.